3DPrinting

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3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.

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Designed & printed a working gear pump (edit: added video & more info) (i.postimg.cc)

submitted 2 years ago* (last edited 2 years ago) by pianoplant to c/3dprinting

12 comments fedilink hide all child comments

Just a quick hobby + learning project. If people are interested I am happy to post more pics. PLA exterior + TPU seals + Nylon (COPA) bushings.

Everything is 3d printed except the hardware & motor. The hose adapters have 1/4 NPT ends on them. NPT has a tapered thread so I found that I could screw them in partway by hand then heat them up slightly with a soldering iron to soften the PLA then screw them in the rest of the way. Makes a nice watertight seal despite the roughness of the 3d printed threads. If they start leaking I can unscrew them (leaving behind threads perfectly molded to the fittings) then add some pip seal tape and put them back in.

What do you guys think?

EDIT: here's a photo of the parts separate exploded_view

and a video: https://imgur.com/a/cd8co68

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[–] pianoplant 3 points 2 years ago* (last edited 2 years ago)

Haha thank you! Yeah flat gasket is simpler & has worked so much better than past attempts at o rings and such. Definitely the way to go in my opinion. Just keep in mind when the grommet is compressed it grows horizontally slightly so you may need to inset the perimeter slightly. (You can see I had to do that with the interior section)