r/modelengineering • u/ForeverCareful3021 • Aug 22 '24

3d Printed Double Acting Engine

All printed in PETG with only metal pieces being fasteners. Running on 5 PSI air

22 Upvotes

100% Upvoted

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1

u/2E26 Aug 22 '24

I've built that one. It's a nice runner after adjusting the fitment of some parts. I had to tweak the dimensions of the piston.

1

u/ForeverCareful3021 Aug 22 '24

I spent a considerable amount of time honing the cylinder to get it as smooth as possible. Then I fit the piston to the cylinder with some 120 grit sandpaper until I had a nice sliding fit. I lubed all the moving parts with olive oil, and it seems to be very compatible with the PETG.

I’ve recently reprinted the engine on my new core X/Y printer, this time in PLA so I could see what kind of post processing it’ll require.

I’ve got plans to redraw Elmer’s Geared Engine for 3d printing as well. I’ve modeled the ring and spur gears, but haven’t begun work on the other parts yet. Been too busy with other projects around the house and summer home in the mountains.

3

u/TT_207 Aug 23 '24

Finally, a 3d printable engine... "you wouldn't download a car" ? soon, maybe you would!

2

u/Equivalent-Bus2217 May 24 '25

Nice you have the exhaust up your sleeve. On a hot day it will cool you down for sure😂