Oil Mist Filter for Vacuum Pump

prusaprinters

<p>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.</p><p>Required parts:</p><p>M4x22 O-ring (22 mm ID, 30 mm OD, 4 mm width) - example:</p><p>https://amazon.com/gp/product/B00595ZK8S<br/>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)</p><p>Assembly:</p><p>* put o-ring over threads; push down into groove a bit (just so it seats when screwed in)<br/>* insert the "insert"; turn sideways to get past lip; place in bottom of filter at top of funnel<br/>  * the flat grille side goes toward the pump end<br/>* pack in some filter media; try not to leave any way for the air to get through unfiltered<br/>* install the cap; some silicone lubricant may help; the threads can be a bit tight depending<br/>* screw filter onto vacuum pump exhaust port</p><p>The f3d file is included, and is mostly parameterized, in case the height seems excessive or needs to fit in a shorter print volume.</p><p>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, but I can't speak to the long-term impact on the vacuum pump, nor is it really 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 filter.</p><p>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, and just in case some other color might interact with the oil somehow (probably would be fine, but YMMV). 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.</p><p>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 better, depending on the printer and calibration. It comes out as a good fit to the pump threads with default scale on my MK3S+.</p><p>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 it'll go on there easier, and it's not like the top cap needs to be undone and redone super often. If you happen to mod the model to use a coarser thread for the top cap and you've tested it out, it'd be cool to add a remix that way.</p><p>Remixes with adjusted parameters based on the f3d file are welcome, like if you find it needs adjusting to fit on a different pump or whatever.</p><p>Print Settings</p><p>Prusa MK3S+</p><p> </p><p>Rafts:</p><p>No</p><p> </p><p>Supports:</p><p>No</p><p> </p><p>Resolution:</p><p>0.2</p><p> </p><p>Infill:</p><p>100%</p><p> </p><p>Filament brand:</p><p>any</p><p> </p><p>Filament color:</p><p>Transparent (if you want to see the filter media)</p><p> </p><p>Filament material:</p><p>PETG</p><p> </p><p>Notes:</p><p>100% infill recommended (sturdy, no air gaps)</p><p> </p>