Oil Mist Filter for Vacuum Pump

thingiverse

I use this as an oil mist filter for a popular 2 stage 5 cfm vacuum pump. If I understand correctly, it may also fit some other brands of vacuum pump. Required parts: * M4x22 O-ring (22 mm ID, 30 mm OD, 4 mm width) - example: * https://amazon.com/gp/product/B00595ZK8S * filter media, such non-woven polypropylene, or possibly 1-2 ripped and wadded old t-shirts or some clean shop rags (YMMV depending on filter media) The f3d file is included, and is mostly parameterized, in case the height seems excessive or needs to fit in a shorter print volume, etc. The flow with filter media packed in tight is not as free-flowing as a normal filter I'm sure, but seems adequate for my purposes so far. I can't speak to the long-term impact of flow restriction on the vacuum pump. It's not designed to recover any of the oil that mists up into the filter media, so oil consumption _may_ be higher than a good non-printed "recovery" filter. I recommend dry PETG for this. I used transparent so I can slightly see what's going on with the filter media to some extent. I used 0.2mm layer height to make sure the threads would come out ok. I recommend making sure the PETG is quite dry before this print since it does have quite a few retractions to get the honeycombs done. A test print to check the thread is included - it may be possible to adjust the X and Y scale (and I guess maybe Z) to make the thread fit, depending on the printer and calibration. It's a good fit to the pump threads with default scale on my MK3S+. If I was doing this over again I'd probably use a coarser thread for the top cap, but if you put a little silicone lubricant on the threads, the cap will go on easier. If you happen to mod the model to use a coarser thread for the top cap and you've tested that it stays closed ok, it'd be cool to add a remix that way.