u/Deep-Today5715

I recently got into fixed wing FPV, now I want to make my own planes and been learning the design principles. However, the material choice for making fuselages puts me at a pause. I see that most commercial planes use machined EPP foam, but it is very expensive, hard to get and would require a CNC machine or extremely laborious and time-consuming hand-sculpting for anything that cannot be hot-wired (so basically no compound curvature surfaces).

Other foams are available, but they are nowhere near as strong as EPP for the same weight, and all the manufacturing difficulties still apply.

Balsa wood is not available in large enough sizes where I live, and manufacturing would still be very laborious and limiting in the kinds of shapes I could make.

3D printing is definitely the fastest way to produce complex shapes accurately, but foaming materials (LW-PLA, LW-PETG, LW-ABS, etc.) are very fragile, meaning any medium to hard crash would require replacing parts of the fuselage, plus releasing lots of microplastics into the environment since there is no recycling of 3D printing filaments in my country. More durable materials, such as 64D TPU are very durable, but also very heavy, so the final durability/weight ratio is nowhere near to EPP.

Yet another option I've been considering is to 3D print a lightweight shell, and fill it with expanding PU foam, something like 35kg/m^3 density, being careful to keep temperature low enough not to melt the plastic. This could also probably be done with casting in 3D printed molds, then separating and taping to achieve smooth surface. I haven't found much on this technique.

I also looked into biodegradable composites, such as flax or jute fiber cloth combined with shellac or bone glue (environmentally friendly and non-toxic alternative to fiberglass+epoxy), but there is very little research on it. In theory it would allow making complex and accurate shapes with medium amount of labor, but durability is not yet known. And it would still require 3D printing molds that would likely be discarded any time I need to modify the shape of the plane.

Are there any other options? What I am seeking is a manufacturing way that would allow producing complex shapes in a practical way for fast design iterations, be as strong as EPP for the same weight, not environmentally damaging, and preferably not requiring huge investments such as a CNC machine. I realize this might be one of these "choose 2 out of 3" situations, but I'm hoping I missed something since I'm still early in my research.

I recently got into fixed wing FPV, now I want to make my own planes and been learning the design principles. However, the material choice for making fuselages puts me at a pause. I see that most commercial planes use machined EPP foam, but it is very expensive, hard to get and would require a CNC machine or extremely laborious and time-consuming hand-sculpting for anything that cannot be hot-wired (so basically no compound curvature surfaces).

Other foams are available, but they are nowhere near as strong as EPP for the same weight, and all the manufacturing difficulties still apply.

Balsa wood is not available in large enough sizes where I live, and manufacturing would still be very laborious and limiting in the kinds of shapes I could make.

3D printing is definitely the fastest way to produce complex shapes accurately, but foaming materials (LW-PLA, LW-PETG, LW-ABS, etc.) are very fragile, meaning any medium to hard crash would require replacing parts of the fuselage, plus releasing lots of microplastics into the environment since there is no recycling of 3D printing filaments in my country. More durable materials, such as 64D TPU are very durable, but also very heavy, so the final durability/weight ratio is nowhere near to EPP.

I also looked into biodegradable composites, such as flax or jute fiber cloth combined with shellac or bone glue (environmentally friendly and non-toxic alternative to fiberglass+epoxy), but there is very little research on it. In theory it would allow making complex and accurate shapes with medium amount of labor, but durability is not yet known. And it would still require 3D printing molds that would likely be discarded any time I need to modify the shape of the plane.

Are there any other options? What I am seeking is a manufacturing way that would allow producing complex shapes in a practical way for fast design iterations, be as strong as EPP for the same weight, not environmentally damaging, and preferably not requiring huge investments such as a CNC machine. I realize this might be one of these "choose 2 out of 3" situations, but I'm hoping I missed something since I'm still early in my research.

Hi, I am an amateur boatbuilder, and I often use aluminum tubes (6060 T6) for free-standing masts and other spars. Boat masts like this are suppose to be tapered (larger diameter at the bottom, smaller at the top), for example 80mm at bottom and 40mm at top, this is done for weight-savings and desirable bend characteristics. Taper profile typically follows an arc. I used to make masts like this from wood but quality lumber shortages made this completely impractical.

I am wondering if this is possible to make a tapered tube like this in aluminum. I don't think I can replicate industrial processes to make masts like that in my humble garage conditions, but perhaps something could be done with an angle grinder, clamps and a welding rig? I was thinking of cutting a slit in the tube that widens towards the top of the mast, forcing the slit closed with the clamps, and then welding the seam. However, the forces involved might make this unrealistic, and heating the tube would probably ruin it's temper.

The final dimensions don't have to be perfect as the long as the mast remains straight (a few centimeter bend is ok if it is consistent) and doesn't have weak spots.

Does anyone have experience with anything similar and could suggest a practical way to achieve this?

EDIT: another idea I just had - what if I don't taper the diameter, but reduce wall thickness gradually up the mast? Not sure how to do it, lathe would be obvious but there is no lathe in my country that can turn 80mm diameter and 4.5m length tube. Doing it with an angle grinder would be terrible. Maybe a sanding belt on a drill, wrapped around the tube..? My ideas are silly but maybe someone could suggest something smart.

Hi, I recently got into FPV fixed wing planes, and want to do some designs of my own. I am well versed in 3D printing (8 years of experience with technical materials). However, my research revealed that typical lightweight (foaming) filaments (PLA, PETG, ASA), while indeed very light, are nowhere near as strong in RC plane builds compared to EPP foam when it comes to high impacts - they tend to shatter into a million pieces. My own testing with foaming filaments showed the same.

So I started looking into flexibles and semi flexes, and I was suggested to try 64D TPU - supposedly rigid enough to hold it's shape with typical carbon rod reinforcements, but flexible enough to take big hits without damage. It is not foaming, so not as lightweight, but my hope is that I could use very little of it, just a thin shell, and end up with a decent airframe.

Before ordering anything, I wonder if anyone has tried this particular material, and what were your experiences? Bonus question, what about repairing and smoothing it (removing layer lines), any chances of that? Apparently DMSO doesn't work for this, and torch would probably distort the geometry when printed so thin.

I've been working with fiberglass and epoxy resins for my personal RC plane projects, but since I'm doing a lot of testing and prototype designs that get discarded during the design process, I feel increasingly guilty about all the waste and microplastics that come along with it. Unfortunately for the shapes that I want to make going with pure wood is just not an option.

I've been researching eco-friendly alternatives for making composite layup projects, and there are some for fibers (flax, hemp, etc.), which unfortunately have much reduced mechanical properties when compared to fiberglass, but still suitable for my use case.

However, I can't seem to find any decent alternative to epoxy resin that would make the final composite material naturally biodegradable, so using either of these fibers becomes a moot point. Closest thing I found was ecopoxy, which unfortunately is very expensive and almost impossible in retail quantities to get where I live (EU).

Can anyone suggest any decent alternatives that are fully biodegradable, affordable and have at least somewhat comparable mechanical properties to fiberglass+epoxy for wet layups? Anything better than paper+PVA glue is worth considering to me. I've found a research paper ("Preparation and characterization of jute fiber reinforced shellac biocomposites: effect of additive") that suggest jute fiber and shellac, which boasts quite impressive mechanical properties for such crude materials, but they used mechanical pressure and heat treatment to achieve that, which is not practical in home conditions, and I'm unsure of how much mechanical strength would be lost without it.

I've been working with fiberglass and epoxy resins for my personal RC plane projects, but since I'm doing a lot of testing and prototype designs that get discarded during the design process, I feel increasingly guilty about all the waste and microplastics that come along with it. Unfortunately for the shapes that I want to make going with pure wood is just not an option.

I've been researching eco-friendly alternatives for making composite layup projects, and there are some for fibers (flax, hemp, etc.), which unfortunately have much reduced mechanical properties when compared to fiberglass, but still suitable for my use case.

However, I can't seem to find any decent alternative to epoxy resin that would make the final composite material naturally biodegradable, so using either of these fibers becomes a moot point. Closest thing I found was ecopoxy, which unfortunately is very expensive and almost impossible in retail quantities to get where I live (EU).

Can anyone suggest any decent alternatives that are fully biodegradable, affordable and have at least somewhat comparable mechanical properties to fiberglass+epoxy for wet layups? Anything better than paper+PVA glue is worth considering to me. I've found this paper that suggest jute fiber and shellac, which boasts quite impressive mechanical properties for such crude materials, but they used mechanical pressure and heat treatment to achieve that, which is not practical in home conditions, and I'm unsure of how much mechanical strength would be lost without it.

Sorry if I missed something, but soon after these scenes came out on YT they were deleted... Then someone reposted them elsewhere, got deleted again... Saw a post in this subreddit just a few minutes ago where someone reposted them yet again and said they will delete these scenes very soon...

...Why? Were these scenes leaked against the wishes of the studio or something? I don't get it.

Hi, I am designing sailboats, including their sails. For that, there are softwares like Sailcut CAD, which allow you to define desired 3D sail shape, and then produces flat patterns for panels of the sail. Basic idea is that when you join two curved edges of fabric, the extra material gets pushed into the panels, forcing a compound curvature. This is a screenshot from Sailcut CAD of a sail profile, and how the flat patterns (development panels) look like. The curvature on the mating edges is very subtle, but it's there if you look closely.

https://preview.redd.it/brbkafg436hh1.png?width=1960&format=png&auto=webp&s=ab5aa825ed78639dde00f0fceb52ce9abf6d97ee

Perhaps this is easier to visualize with how air balloons are made - same idea, curved panels stitched together to force a 3D curved shape.

https://preview.redd.it/wj8y1m8546hh1.png?width=1000&format=png&auto=webp&s=63f6a221418b6d3e86647b0f4bc025a983fc6e71

Sails are the same, just less extreme. Compound curvature created through forcing curved edges into contact.

Now, problem is, that Sailcut CAD doesn't have parametric link with SW, and exporting dimensions from SW to Sailcut and then importing DXFs back is a royal PITA. Boat design requires A LOT of iterations, so this becomes a major bottleneck.

So, to workaround the issue, I thought, is it possible to recreate this workflow in SW alone?

I designed the sail I need with SW, fully 3D, with highly controlled shape. Then I split it into panels, and made a flat pattern of each. However, the result is very different from what I had in Sailcut:

https://preview.redd.it/g8z96cnc76hh1.png?width=1135&format=png&auto=webp&s=f18d3226128ac2f81d7d4ae7a24c4a5d82b87765

The panel edges are curved, yes, but not really in a way that would force a compound curvature shape into the sail when sewn together. I printed them out on paper, cut them with scissors and taped together to make sure - the resulting sail is nearly flat.

This suggests to me that the algorithm SW uses to flatten compound curvature shapes attempts to evenly distribute strain rather than to concentrate that strain along the edges, which makes sense for most applications, but not this one.

Can anyone offer any guidance on how to get the kind of flat patterns that I need here solely within SW? I know SW is not really meant for this kind of work, but there really aren't any other softwares out there that integrate with SW, and without automatic workflow each design iteration becomes a massive chore. If I could just figure out this bit, it would be a massive time saver.

I will try and post a link to the part in the comments (2024 version). Check configurations tab for flat pattern configuration.

Sveiki, situacija tokia jog turiu 96-erių senelę, kuriai demencija, savarankiškai nebegali vaikščioti, valgyti, atlikti tualeto reikalus ir t.t. Mūsų šeimos bute vos išsitenkam su žmona ir vaiku, senelė savo bute (40min kelio į vieną pusę), ir mes su žmona bei mano pusbroliu pakaitom ją prižiūrim, su ja realiai reik vos ne kiaurą parą būt šalia, nes sugalvoja bandyti stotis, kur nors eiti, nukrenta, ir t.t. Jau 2 metai taip, ištisai pasiiminėt tenka laisvas dienas iš darbo visiems trims pakaitom, buvau net praradęs darbą dėl pravaikštų, nes tiesiog nebuvo kito varianto.

Pasinaudojom galimybe valstybės finansuojamai iškviečiamai seselei, bet pasibaigė nemokamas laikas (o naudos tai buvo labai nedaug), tada 4 mėnesių finansavimu senelių namams (Griniaus slaugos ligoninė), tas leidžia mum lankyti ją tik vakarais, o dieną galime dirbti ir prižiūrėti vaiką (pusbrolis irgi šeimą turi). Problema ta kad sąlygos ten absoliučiai siaubingos, priežiūros praktiškai nulis, seselės pavargusios ir visiškai nesirūpina, maitinimas baisesnis negu kalėjime, nėra oro kondicionierių, žodžiu visiškas žmogaus kankinimas. Ir priedo tų 4 mėnesių liko tik 3 savaitės, o paskui kaina 90€ dienai (3000€ mėnesiui), kas yra visiškas kosmosas, mes kartu su žmona sudėjus tiek neuždirbam.

Gal kas nors galite patarti ar yra Kaune geresnis variantas tokiam atvejui? Mes daugų daugiausia galime skirti iki 800€ per mėnesį, susiskaičiavom finansus ir net tiek būtų žiauriai sunku sukrapštyti, bet na kaip nors. Senelė panašu gyvens dar ilgai, kad ir kokia prasta jos būklė, bet labai stabili, ir mes norime kad tie jos paskutiniai keli metai būtų su kuo mažiau kančios, bet tiesiog nebeturim laiko ir finansų prie jos būti kiaurą parą.

I have been a science, space and rocketry nerd long before I found PHM (watched pretty much all the other space/sci-fi movies, have thousands of hours playing KSP, did some amateur rocketry, etc.), while my girlfriend didn't have the first clue about any of the space stuff. Had to do a lot of prepping with napkin sketches and several evenings of orbital mechanics / rocket technology / relativity / astrophysics explanations (by her demand, she is super curious about these things) before I even suggested watching PHM together.

Still, on the first watch together, she paused the movie every 10 minutes and had me explain things, sometimes even rewinding a few seconds for the fast scenes. That is when I realized that PHM movie is really difficult to follow for someone who doesn't have a background in space stuff. I suppose understanding all the science details is not a necessity (unlike the book), but you'd be missing out on the majority of what makes it fun. In that regard, the movie is fast. Different critical details are introduced in a span of just a few seconds, and never explained again. Blink and you'll miss it. It didn't bother me when I first watched it because I was already very familiar with most of the concepts, but for a casual viewer it can really be difficult to keep up. I had a few friends who watched PHM and thought was unrealistic from a scientific standpoint, simply because lots of scientific explanations were done super fast or just vaguely suggested, almost assuming you'd have read the book beforehand.

For example, things like - why was gravity on and off at different times. How exactly Astrophage lifecycle worked and how could it carry so much energy. Why couldn't Hail Mary carry more fuel and do a return trip. Why Rocky retracted the tunnel, had Grace spin up the ship and connected again. How did Rocky know what atmosphere Grace needs in the tunnel. How did Rocky understand Grace so well. How did he see stuff outside his ship. How could Eridians have known about Astrophage if they have no eyes and starlight doesn't even reach the surface of their homeworld. When Rocky was quoting time and years, was it Earth years or Erid years (for example how long he's been together with Adrian). Why was the spin drive demo done by melting steel when it seems so dangerous, messy and unscientific. Why were there no other backup astronauts except Grace. How did Grace see all these beautiful colors during the Adrian sampling if human's can't see IR. Why was the ship flying backwards during the fishing scene. Why couldn't they have made longer chain to make fishing safer. Why Rocky had so much extra fuel. How did >!Rocky return to his environment after saving Grace if we saw him fall down to the floor and stop moving right after dragging Grace!<. How did >!Grace find Rocky's ship!< at the end. And so on. All reasonable questions, and yeah, I know answers to all of them, but to a casual viewer who didn't read the book, the movie does gloss over these details really fast or implies answers from the context.

Can't blame the directors though, PHM is a very difficult book to adapt to the screen without making it 10 hours long, so there was simply no time to take things slower. On the upside, the rewatch value is excellent, as each time you pick up new details. Same with the book (read it 3 times now). I applaud the work Phil and Christopher did, and I can't imagine anyone could have done a better job with that runtime. So I'm not criticizing, just realizing for the first time that it would be super confusing for a layman.

Anyway, with occasional explanation pause or rewinding my girlfriend was able to understand at least 90% of the movie, and enjoyed it thoroughly. At the beginning she made fun of me for shedding a few tears over the >!Yao and Ilyukhina burial!<scene (every time I watch the movie I get even more emotional). By the time >!Rocky offered to sacrifice 6 years for Grace go home!<, we were both crying. After the >!Rocky sacrifice!< scene, my girlfriend said she'll murder me if >!Rocky doesn't wake up!<.

When I started bawling my eyes out during the final reunion scene, she hug me and started singing "Just stop your crying, it's a sign of the times". I laughed my ass off, it was so unexpected and amazing at the same time. She is the one.

It has been a few weeks, she's listening to the audiobook now, and I couldn't be more happy. She got sick last week, and as I cared for her, she said I'll have to watch her sleep now, and afterwards she watched me sleep in the mornings since she's an early bird, and I'm definitely not. It started as a joke, but now we both agree watching someone over you really does make sleep feel better. Or at least that's what we choose to believe. I guess Eridians really are on to something there lol.

So anyway, just wanted to share these observations about the pace of the movie and the fun details of introducing it to someone who didn't have the first clue about space stuff. Wondering if any of you guys had similar experiences.

I found a private listing for an item I want to buy, but it's in another country, too far for me to drive there and make the purchase in-person, and I don't want to risk doing a wire transfer and expect the seller to ship it to my location. Item is of high value and there are no other sources to buy it.

Are there any companies in the EU that would send a courier to this seller, pay him in cash, collect the item, and deliver it to my country? I would gladly pay extra for this service, because I don't have the time to make the drive myself, and I don't know anyone in person who could do this either.

I really like working with a split Property Manager because it makes interacting with Feature Tree much more convenient than the default behavior (where Feature Tree moves to the model area when Property Manager is on top).

However, every time I create or edit any feature, the Feature Manager becomes very small, and I have to resize it to see all the controls EVERY TIME. Example:

https://i.redd.it/bwga4r2jvs9h1.gif

In Options -> General there is setting called "Auto-size PropertyManager when panels are split", which appears to be directly related to this issue, but checking or unchecking it makes zero difference, the behavior is the same.

Can anyone tell me how to fix this?

Not on Earth, obviously, but I can't help but wonder if it were possible on another planet or moon (for example for an alien civilization) that were for some reason unable to develop rocket technology. One obvious way is to build a tower up to GEO altitude, but even with very low gravity and fast planet rotation, that might be impossible because structures meant for compressive stresses are far heavier structures than structures for tensile stresses. I wonder, is there any other feasible way?

I suspected this for a while, but I finally have some concrete evidence. I found it odd that recently whether someone here inquires about about 3DX or PLM in general, there is always a comment or two arguing for 3DX, praising it or sharing their own success story with it. I found it odd because there were no such comments before (well all know how hard 3DX sucks), and now these comments pop up every time.

I inspected these suspicious accounts posting these comments, and some of them look reasonably legit, while others have all their activity hidden.

But I finally caught them red-handed. On a post titled "What’s the best software for integrating SolidWorks CAD data into PLM?" (Can't paste a link, but you can find it easily on this subreddit), two of these suspected bots posted an exact same comment:

https://preview.redd.it/w5hrls84i78h1.png?width=1348&format=png&auto=webp&s=d80687fee732b750ebd2b34b630dda8182df81f1

And moments after I called it out, one of them was deleted:

https://preview.redd.it/nsmem867i78h1.png?width=1343&format=png&auto=webp&s=781ee1f0b99f982ff50d91fa21baa9bcec17de81

So, just something I thought you guys want to be aware of. If Dassault is truly resorting to such tactics on purpose to bait people into using 3DX (I can't really find any other good explanation), you might think twice.

Mods, if you find this important and true, perhaps this would warrant a pinned post?

-------------------------------------------

IMPORTANT EDIT:

Inevitable-Tale-6904 reached out to me, explaining that he is not a bot, who made a mistake of posting the comment from a wrong (personal) account, and then tried correcting by posting from the other one, but forgot to delete the original comment, leading to appearing as a bot. He claims to be a DS employee, however not directed by the company to shift public perception, but instead personally believing in 3DX. He has provided some personal identification details that I should not post publicly, but personally I am leaning towards believing what he said. You can check his account, and his personal account (bathfoamocean), and decide for yourself whether to believe him or not.

I am leaving this post up, because even if it was a genuine misunderstanding, I stand by what I said about noticing a lot of very fishy pro-3DX comments lately, and this one case doesn't prove either cases to be genuine or not. I think it would be best if each of us makes our own opinion given all the facts we have available.

I've read the book once, listened to the audiobook twice, watched the movie twice. I think I've been subconsciously avoiding this thought because of how heavy it is, but it finally hit me just how devastating it must have been for Rocky when Grace went unconscious during the spin after the Adrian fishing expedition.

I mean, he's a deeply social creature whose entire existence revolves around community, and even before meeting Grace he had already endured something almost unimaginable to someone like him. He watched his entire crew die one by one from an unknown cause, completely powerless to stop it. As an engineer, his whole life was about solving problems and fixing things, yet he couldn't fix the only thing that truly mattered because he didn't even understand what was happening. And then he was alone, for 46 years. Even for Eridians, that must be a lot. 46 years with nobody to talk to. 46 years of going to sleep not knowing whether he would wake up, because there was no one there to watch over him. 46 years deprived of what was probably one of the most fundamental psychological needs of his species.

And then he met Grace. Suddenly there was someone to talk to again, someone to work with, someone to solve problems alongside. For the first time in decades, there was hope, not just hope of completing the mission and saving Erid, but a hope that he will never again be alone. For the first time in 46 years, he could sleep without crippling anxiety, knowing that there was a friend to watch over him.

Considering that Eridians are far more social and interdependent than humans, it's hard to imagine what that must have meant to him. Honestly, it's remarkable how much composure he showed during their first interactions. I mean, I try to imagine myself being stranded alone on an island for ten years and then suddenly meeting another intelligent person. I would probably break down on the spot - crying, hugging them, couldn't hold back the desperation. Yet Rocky had to suppress whatever emotions had been building inside him for nearly half a century. First he had to establish communication, then determine whether Grace could be trusted, then focus on the mission.

Then came the EVA. Grace risked his life outside the ship while Rocky was trapped in his own environment, unable to help if anything went wrong. Imagine if Grace had fallen from the ship and plunged into Adrian. I honesty don't even want to think about what that would have done to Rocky. But Grace came back, the danger was over, his friend was safe.

And then the spin happened. In an instant, all that relief was ripped away. The ship nearly tore itself apart, and Grace was left unconscious. Once again, Rocky found himself facing the nightmare he knew all too well - watching someone he cared about to die while being powerless to stop it. I can't begin to imagine the fear, the terror, the grief, the desperation that the little guy must have felt. Not only was he losing his last and only friend, but he was also facing the prospect of being stranded again - alone, confined, and unable even to return the sample to Erid, his last few minutes spent in agony and helplessness. The solution to his people's extinction was so close, and it would have been taken away just because his xenonite ball rolled to the other side of the cockpit and he could not reach it in time.

At that point, I completely understand why desperation pushed him to break out of his shell despite knowing it would likely kill him in excruciating pain. His last ditch effort to save his friend and his people, choosing to rather die than to fail everyone and be alone again.

I knew all of these facts individually before. But when they finally clicked together, I just couldn't stop crying. Looking at everything Rocky had endured - the way he was raised, the expectations placed on him, the loss of his crew, the crushing loneliness, and then finally finding friendship again - made me realize just how much emotional weight he was carrying in that moment. And suddenly that scene became one of the most heartbreaking parts of the entire story to me...

Long story short, I got a 2009 RAV4 with ~250k km on it, 2.4l D-CAT engine (2AZ-FE), bought used 5 years ago for 7k €. About a month ago, fuel consumption increased 2x and exhaust would produce lots of white smoke during DPF clean cycles (which would happen every 10 minutes or so), plus the engine started eating oil like mad.

I brought it to a shop that specializes in diesel engines. Suspecting, of course, piston seals, as they are a known problem on this engine. Shop still checked injectors and turbo, but they checked out fine, so they said that it could be the seals, but it would be very expensive to try and replace parts individually to troubleshoot, and they suggested replacing the whole engine instead, since a new engine is ~200€ (second hand of course) and the job to replace it is ~1000€.

I agreed, and they suggested a place to buy a new engine. I contacted with them, and set the deal. The seller said they only provide warranty for first engine start (replacement if it won't start). I didn't like that, but apparently this is the norm, and every other seller I talked to said the same - no warranties.

While replacing the engine, the shop also said the clutch is shot (although I didn't notice any issues when driving), so they opted to replace that too. Lots of other small things that they found need fixing or replacing along the way, all racking up the final cost.

So they replaced the engine, it started, but after initial tests it turns out it leaks coolant or something, meaning the engine is defective. The seller agreed to replace the engine, but they refuse to compensate for the job, so that's 2000€ instead of 1000€ (two engine changes).

At this point it is becoming ridiculous, and I can't help but wonder if I'm being ripped off. What if the second engine won't work either? That's another 1000€ for changing it.

What should I do? I absolutely want to save this car, but I feel like I'm being toyed with, and if anything else goes wrong, I'll be paying what the car is worth for alone in repairs.

Hi, I am designing a fiddle swivel block with cam cleat using sheet metal tools for the body, idea being to 3D print it flat and then heat-bend into shape (I've done this before, and it results in extremely strong parts):

https://i.redd.it/oo3gdum0ao4h1.gif

I ran a very simple simulation, imitating rope pull on that pulley, and as can be expected, the weakest part is the bend relief:

https://preview.redd.it/yv5hrk05ao4h1.png?width=2239&format=png&auto=webp&s=c90612e698b8b4165ff56994c5b5393f98c23ab0

As you can see, I already tried making it as round as possible, leaving no sharp edges to prevent stress concentrations, but ideally I would like to fill that gap, something like this:

https://preview.redd.it/fmi7dte8ao4h1.png?width=2634&format=png&auto=webp&s=2668b61691e6d3a4e4a1c398207b45461276275e

However, whatever I try to fill that gap, the part won't flatten afterwards anymore. I don't have Premium so I can't do surface flatten either, and I feel there should be a way to do this with sheet metal. Can anyone with more experience advise me on how to fill that gap, blending in the bend?

I will try to post a link to the part in the comments, can't post it here due to filters.

[ Removed by Reddit on account of violating the content policy. ]

Hi, I bought Keychron K5 Max QMK a while ago because I really like these low-profile keyboards. I immediately changed switches to GATERON KS-33 Low Profile Red Silent 2.0, goal being to make the sound more quiet.

While the keyboard is overall very comfortable and great overal, for some reason the sound is quite annoying. There is some high-pitch clank to the keys, especially when typing fast, and especially on larger keys, like space, backspace, enter, etc.

Can anyone advise, did I choose the wrong keyboard or the wrong switches? I don't necessarily need 100% silent keyboard - low, deep pitch is fine, even if loud, but I absolutely cannot stand anything medium or high-pitch. Suggestions?