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laura 2026-06-12 14:37:31 +02:00
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# FreeCAD 2026 Design Contest
This is my entry to the (2026 FreeCAD design contest)[https://forum.freecad.org/viewtopic.php?t=105082].
This is my entry to the [2026 FreeCAD design contest](https://forum.freecad.org/viewtopic.php?t=105082).
For assembly instructions see the assembly guide.
## Initial Design Choices
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I think a fair cost assesment is somewhere inbetween the two, since most people will have some filament, and so the 6.60€ per valve of filament are a bit over the top. I think the average maker would probably spend around 5-6€ per valve.
## Performance Assesment/Concerns/Room for improvement
I have not had the opportunity to test maximum holding and closing pressure, nor how many close/open cycles it can handle. I hope to get around to running those tests in the final week before the submission deadline. (The only test I've managed so far)[https://chaos.social/@la/116727325081926518] was me blowing into the tube with the other end in a glass of water, to see if it closes and seals agains my lung pressure.
I have not had the opportunity to test maximum holding and closing pressure, nor how many close/open cycles it can handle. I hope to get around to running those tests in the final week before the submission deadline. [The only test I've managed so far](https://chaos.social/@la/116727325081926518) was me blowing into the tube with the other end in a glass of water, to see if it closes and seals agains my lung pressure.
I am particularly concerened with the requirement in the contest brief, requireing gas sealing at 0.5bar, and wear resistance.