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
and a video: https://imgur.com/a/cd8co68
Ok - here’s what I’m thinking for the rotating shaft seal:
Basically integrating a “packing box” like what’s used for boat propellers
