HEPA Air Filter for LACK Enclosure

thingiverse

UPDATE 08/02/19: .STEP file added for v7. I've reduced chamber volume, print time, and external profile of the filter by adding a reduced height media chamber. UPDATE 01/10/20: A remix of the 120x120x25mm version has been posted on Thingiverse at https://www.thingiverse.com/thing:4095912. This version features a reduced chamber volume, print time, and external profile of the filter by adding a reduced height media chamber. UPDATE 01/24/20: A new version of "Fan Mount (Bottom)" without mesh has been added to reduce print time and complexity. However, be sure to clear the fan blades before plugging in as carbon pellets will be exposed to them in this version. I've also replaced my HEPA filter after four months and posted a photo comparing it to a new filter. UPDATE 06/18/19: This is v7, a significant upgrade with improved print time and airflow restriction. The mesh pattern has been updated from a staggered circle to an optimized staggered hex pattern, reducing the width of each hex to two print lines using a 0.4 nozzle. The mesh height has also been reduced from 3.25mm to 1.5mm. These reductions have decreased print time for the affected components from 12 hours and 45 minutes to 7 hours and 45 minutes. The simplified tool paths have made it easier to print the hex pattern. A comparison of the v6 mesh on the left to the v7 mesh on the right is shown in the picture above. I'm confident that less material means less restriction to airflow, but I have no way of measuring it. This is not only my first share but also my first fully designed and developed 3D print. This is v6 with several refinements to make it easier to print, improve airflow, and hold together without any hardware. The grid pattern has been tweaked multiple times to maximize airflow, improve printability, and ensure it's robust enough but doesn't take forever to print. I was looking for a HEPA air filter for my LACK enclosure and decided to try the "HEPA Filter for 3D Printer" by jmillerfo. However, I thought it would be cool if it was mostly hidden inside the top of the LACK enclosure and I wanted to make it as quiet as possible. I started with a remix of the original design by jmillerfo and ended up remaking and redesigning all components to create this version. Thanks, jmillerfo, for the inspiration and doing the leg work on the parts list! The design uses the following purchased components, but the enclosure is designed to work with any 60mm fan. Simply bolt the fan to the bottom fan mount and don't use the top fan mount to enclose the fans. - 2x Noctua fans: https://www.amazon.com/gp/product/B00VXTANZ4/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 - Carbon pellets: https://www.amazon.com/gp/product/B000YIWT20/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 - Roomba HEPA filters: https://www.amazon.com/gp/product/B00K7DMEJ0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 I use the top and bottom hole covers as a cutting template for the LACK table, which worked out great. The Noctua fans come with a y connector so you can easily tie them together and feed them from a single power source without any additional modifications. This device can also be placed freestanding in the enclosure to clean and recirculate air or used as a solder fume extractor! I hope you find it useful, and please let me know what you think!