Exhaust Filter for a high vacuum pump

thingiverse

These are end caps for a DIY exhaust filter for a single stage high vacuum pump. The base filter design is here: http://www.bvturners.com/exhaust%20filter%20for%20harbor%20freight%20oil%20vacuum%20pump.pdf The end caps here are used instead of the PVC parts in the paper. The threading on the bottom end cap is M27 with 1.5mm thread pitch. At the base of the threads there is room for an O-ring (I used the O-ring that was on the factory exhaust cover). I printed the parts in Matterhacker's NylonX (CF-PA 12) and it worked well. I think PETG would also work (PLA might be too brittle). Print the bottom end cap with the threads at the top. Use support for the lower part of the cap but don't use any supports when printing the threads (or use a soluble support material) The design is available on the Onshape web site here: https://cad.onshape.com/documents/0314b4dce29b6350b0ef8730/w/3f88252ba35ace0b1c6d62a4/e/116e66ba0e7356443b27e351