r/OrcaSlicer

Hey everyone,

If you’ve been following the recent drama between Bambu Lab and the open-source community, things just escalated from a heated debate to an all-out, structured counter-offensive.

Following Bambu Lab's aggressive Cease-and-Desist letter to developer Paweł Jarczak for his OrcaSlicer mod, the Software Freedom Conservancy (SFC) has officially stepped into the ring. They just released a massive statement confirming that Bambu Lab is in direct violation of the AGPLv3 license regarding their proprietary network plugin.

But instead of just waiting around for a years-long lawsuit, the SFC is taking immediate, community-driven action by launching Project "baltobu":

• Reverse-Engineering the Plugin: The SFC is calling for volunteers to completely reverse-engineer Bambu’s closed-source network plugin (libbambu_networking) and replace it with a fully compliant, open-source alternative.
• Reviving the Blocked Code: The SFC is officially hosting and continuing Jarczak’s work under their own umbrella.
• A New Fork ("Viscose"): They are launching a direct fork of Bambu Studio that is 100% free of proprietary "black-box" code.
• Legal Protection: Most importantly, the SFC is acting as a legal shield. They’ve stated they are "not afraid of Bambu's aggression" and will legally and financially protect any volunteer contributing to this project. Paweł Jarczak has also officially joined them.

This is a massive moment for Open Source and the Right to Repair in the 3D printing industry.

Check out the SFC's full, official response and see how you can get involved or support the fund: 👉https://sfconservancy.org/news/2026/may/18/bambu-studio-3d-printer-agpl-violation-response/

What are your thoughts on this? Is this the wake-up call Bambu Lab needed, or will this split the ecosystem even further? Let’s discuss.

Hey, I made a fork for Orca that allows 3D printers to print objects with multiple different nozzle sizes. Currently, it allows different nozzles to be used for applications like printing inner/outer walls, solid/sparse infill, and top/bottom surfaces with different nozzle sizes. You could, for example, print an object with a large nozzle, like 0.8, for the entire body, but you want a better top surface, and you can do the top layer with, let's say, a 0.2 nozzle or whatever you want (see images). I will open a PR later, so hopefully mainline Orca will be able to have the feature too.

My repo is https://github.com/LixNix/OrcaSlicer-multi-nozzle-size-printing

Tutorial on how to build Orca from source can be found at https://www.orcaslicer.com/wiki/developer_reference/how_to_build

Hi all,

I've got a new pla + from Sunlu that I was going to try and do come calibration on.

Im running into issues where the overhang is curling up and the nozzle hits it and dislodged the print from the bed.

Slowdown for overhangs is on. Overhand cooling activation threshold is 50%.

The temp is nothing crazy 220 - 190 deg. Bed clean. I even tried rafts and brims. No joy. Any ideas?

I have a old sindoh 3d printer that I want to get up and running. Their own software that being 3dwox is very old and not updated so I wished to create a tool that will convert a generic marlin profile from orca into a format that my sindoh printer will accept.

I am not very good at programming and this is my first large project, any advise form people who know a lot about these slicing software would be welcome.

I tried ai tools such as claude but they kina break as they comb through the two gcode formats.

If anyone can point me in the correct way that would be incredible

Hi all, after the inclusion of the actual speed view in Orcaslicer, I took a closer look at the speeds present in the retraction test (I am printing the retraction tower using Spectrum PETG-PTFE on an Elegoo Centauri Carbon with MicroSwiss hot end and 0.3mm nozzle).

It seems like the default retraction test model is of too low a resolution to get smooth and continuous flow during the retraction test itself. This is particularly a problem with lower layer heights I think. I was wondering if anyone had any thoughts or noticed that.

Hi all,

Im running a Ender 3v2, running the mriscoc firmware and a couple of upgrades - nothing drastic.

I've got the most upto date Orca 2.3.2, I can see anywhere on the printer settings to 'Enable input shaping' according to the calibration guide it should be in Motion Ability and in Resonance Compensation, but Nada!!

Any advise pls.

Ran a volumetric flow rate test with this generic pla (inland) and got these shrink lines on the wall closest to the aux fan. The rest of the walls look fine. Should I lower my aux fan when printing this material?

Switched from Cura to Orca recently and can’t quite match the quality I had on defaults. Walls are sorted after tweaking, top layer is the last thing giving me trouble.
Photo attached. Ironing the top surface helps — it’s flat now instead of wavy — but I had to drop the top layer speed all the way to 10 mm/s to get there, and it’s still not as clean as Cura was at default speeds.
Weird part: filament matters a lot here.
• eSUN PLA → prints perfectly
• Elegoo PLA and Prusa PLA → this is where the top layer issues show up
All regular PLA, no PLA+. Tried both 210°C and 215°C, no real difference. Also dried the PLA in the oven, didn’t help either. Been digging through threads and haven’t found anything that worked.

Greetings,

Hopefully this is the correct sub for this. I've got a P1S that I've had for some 18 months now. I got it shortly before all the contretemps from BambuLabs regarding locking out other slicers and such.

I've got it in LAN mode and other than start up, have never updated the firmware. It works great with OrcaSlicer running on a Linux box.

This week, I stood up an instance of Bambuddy in my home lab. It's interesting, but what I was primarily looking for was a way to slice and print from my Windows 10 machine which has no internet connectivity.

I've worked through a number of niggles, but I'm not able to print. Bambuddy sees the printer, but the comm's just time out when a print job is sent.

Working with the dev, he commented that my firmware is over a year old and suggested updating it.

My apologies, as I've really not followed this, but what is the current school of thought regarding updating firmware?

Thank you

Hey guys, how can I make this box I'm printing have more infill and fewer solid layers? Right now, it does the equivalent of about two infill layers and then 5 solid layers, which takes forever. I'd like to reduce that to 3 solid layers and increase the infill, is that possible? I tried lowering the 'Bottom shell layers' option from 5 to 3, but nothing changed.

Has anyone else run into this issue? I slice the flow rate 1 file, and it shows flat, straight lines, but on the printer it comes out with concentric circles. And before someone asks, no, this is NOT the YOLO file (i resliced/reprinted to be sure).

Currently running OrcaSlicer version 2.3.1 - I'm trying to upsize a boomerang STL because I want to make it bigger just for fun. The size I want is too big for my plate, so I'm trying to tell my printer to only print half of the boomerang. That way I can just print the same thing twice and glue or plastic weld it together.

To split the part I'm using a negative cube to delete half of the object, but OrcaSlicer won't let the program slice it. I even turned off brims and skirts so I know for certain that the final printed part will still be within the plate. Is there another method I can use to accomplish this?

As in the photo, the outer walls on my prints are getting separated – I started noticing it when I switched into Orca.

Printing on a recently calibrated Ender 3, it happens with all the nozzle sizes, no matter if Arachne or Classic engine. It's not underextrusion, as it happens even if my flow rate is set too high.

Line width doesn't only change the line width, but also widens the tool path, it doesn't help.

What setting might I be missing?