r/StonerEngineering

Is DIY DHV possible?

Basically I’m 18, 3rd year electrical engineering, so I’m not that smart, looking for advice from yall. I want to switch to dhv to better my health, but I can’t order one in the u.s. because i’m under 21. I was wondering if it’s possible to make a torch powered portable dry herb vape myself.

reddit.com
u/Content-Computer-441 — 6 hours ago

My first ever full set. I started with a small ash tray and worked my way up to the rolling tray and mug.

The glaze is made in house and called ‘Aether’. Thanks for looking!

u/jwavy2 — 1 day ago

Sorry if this isn’t the right place, but is this still okay to use?

It isn’t leaking and there’s no shards inside or outside the cart.
I tried tape before realising the health risks so i’ve removed it since.
Any mending tips? or should it be okay as long as i’m careful?

u/j___________o — 2 days ago

2 Part Epoxy or Aquarium Silicon?

Freaking new bong snapped off at the mouth stem. Since there's no direct heat going to that area, I'm wondering if the Epoxy would be best.

I've just never repaired a bong before. But this baby is like two months old and the break feels like it isn't in a bad bad area.

Thoughts?? Thank you all!!

u/ActinoninOut — 1 day ago
▲ 75 r/StonerEngineering+2 crossposts

Just finished this stabilized burl piece and I’m stuck. Every name I think of feels basic. What is she?

u/tomas_holoch — 3 days ago

Ridiculous Bong Friday: Up Cube.

Hello, fellow stoners and welcome to my weed lab. I hope you're ready for the weekend. If not, hit the dispo or call that plug!

Today I felt the need for a cubic vapor chamber. I also need to test the seal on the two DIY whip adapters on the first two bongs. So, the mega cube had to go upside down and two bent neck bongs needed two vapes.

The test was successful, though the mouthpiece kept slipping.

Have a fun and fantastic weekend. Get creative with your bongs and make your own contraption. Happy tokes. ✌️

u/Canna-Cat — 2 days ago

Do yall fw the diy downstem and cone piece?

Used foil for cone piece and a glass straw for the downstem, and a fuck ton of tape

u/Sharpiemanimal — 2 days ago
▲ 19 r/StonerEngineering+1 crossposts

Our air flow design in a Sherlock and blend bowl. Have spoons, straws and more.

We've developed a patent pending design that enhances flavors and smooths the hit. You get a lot higher than a bong. My bigger ones wil get you higher than a gravity bong. And it does all this with less then a third of the weed.

These are the spoon size. And original. We have Gandalf, Sherlock, straws, blend bowls and more. Ill post pics in the future.

Currently in east Texas and want testers. Will be driving back to Florida in 2 weeks. Can meet groups to let them try it on video. You bring your best stuff, bigger terps the best, Something you're currently smoking. I'll supply grinder. Melbourne Florida is my end destination.

I'll only have a limited number i can sell. But i can take orders and have them made and shipped within 2 weeks.

PS. I was asked for science.

O2High Airflow Technology

Engineering and Scientific Principles

Purpose

The O2High Airflow System is an engineered smoke-conditioning device that uses fluid dynamics to modify the physical properties of smoke before it reaches the user. Instead of allowing smoke to travel directly from the bowl to the mouthpiece, the system controls airflow, pressure, expansion, turbulence, and mixing to create a more uniform aerosol while encouraging deposition of larger condensed particles before inhalation.


Stage 1 – Venturi Acceleration

Combustion produces a mixture of gases, water vapor, cannabinoids, terpenes, tars, waxes, oils, ash, and microscopic solid particles.

As this mixture exits the bowl, it enters a precisely sized Venturi section. Because the flow area decreases, smoke velocity increases while static pressure decreases according to fluid dynamics principles.

This pressure drop helps accelerate the smoke and prepares it for rapid expansion in the next stage.


Stage 2 – Rapid Expansion

Immediately after leaving the Venturi, the smoke enters a chamber with substantially greater volume.

This sudden increase in volume causes several things to occur simultaneously:

  • Smoke velocity decreases.
  • Static pressure changes.
  • The aerosol expands.
  • Turbulence increases.
  • Temperature begins to decrease as the smoke mixes with a larger air volume.

These changes alter the behavior of the suspended particles.


Stage 3 – Particle Separation

Smoke is not a true gas. It is an aerosol made up of particles of many different sizes and masses.

The lighter gases and very fine particles follow changes in airflow easily.

Larger droplets of tar, waxes, condensed oils, carbon particles, and ash possess greater inertia.

When airflow rapidly changes direction, expands, or slows, these heavier particles cannot respond as quickly as the surrounding gases. Instead, many continue moving in straighter paths until they contact the chamber walls.

This process is known as inertial impaction, one of the same physical mechanisms used in industrial aerosol separators and air-cleaning equipment.

Once these heavier compounds strike the cooler chamber walls, many condense and adhere to the glass instead of remaining suspended in the airflow.

This explains why expansion chambers often accumulate sticky resin over time. That resin represents material that is no longer traveling toward the user's lungs.

The exact percentage removed depends on chamber geometry, airflow rate, particle size distribution, and smoking conditions, and should ultimately be measured through laboratory testing.


Stage 4 – Controlled Air Entrainment

After expansion, fresh ambient air enters through carefully engineered ports.

These ports are not simply holes.

Their diameter, position, angle, and total flow area are designed to meter outside air into the smoke stream in controlled proportions.

This reduces localized smoke density while maintaining a consistent aerosol throughout the airflow.


Stage 5 – Turbulent Blending

The geometry of the blending chamber intentionally generates rotational flow and turbulence.

Instead of separate streams of smoke and fresh air, the system promotes repeated mixing throughout the chamber.

This creates a more homogeneous aerosol before it reaches the mouthpiece.

The objective is not dilution—it is conditioning the smoke into a more evenly distributed aerosol.


Stage 6 – Delivery to the User

By the time the aerosol reaches the mouthpiece, it has undergone:

  • Venturi acceleration
  • Rapid expansion
  • Particle deposition
  • Controlled air entrainment
  • Turbulent mixing
  • Cooling

The intended result is a smoother, cooler, more uniform aerosol with fewer larger condensed particles remaining suspended.

Many users report smoother draws, improved flavor, reduced harshness, and greater satisfaction while using less material, although these experiences should be validated through formal testing.


Engineering Principles Used

The O2High system incorporates established principles of fluid dynamics and aerosol physics, including:

  • Venturi effect
  • Bernoulli's principle
  • Pressure differential
  • Expansion flow
  • Turbulent mixing
  • Vortex generation
  • Controlled air entrainment
  • Inertial impaction
  • Aerosol particle deposition
  • Residence-time optimization

No single principle produces the effect. The system is designed so each stage builds upon the previous one.


Design Philosophy

Every internal dimension is engineered.

Venturi diameter, chamber volume, airflow port diameter, airflow angles, diffuser geometry, chamber spacing, and blending volume all interact to determine airflow behavior.

Even changes of fractions of a millimeter can alter pressure, turbulence, particle trajectories, and overall performance.

The O2High system is therefore designed as a complete airflow management system rather than a conventional smoking pipe.

u/Impossible-Deal-9191 — 4 days ago

Space dynavap

Made this space calumet with halo and ball r cap tip, the modularity that offert dynavap is incredible 💫

Pretty nice clouds

u/Top-Complaint-838 — 2 days ago

My current….thing

Yeah I really have no explanation for why i made this. Its just an ash catcher and a nipper bottle. Functions surprisingly well. Im thinking about adding a silicone base to the ash catcher for added stability. More upgrades and improvements to come. Eventually? Maybe. Possibly

u/LuckyChemistry118 — 3 days ago