HEPA/Activated Carbon Filter

thingiverse

Update 12/28/2016: Everything is printed and fits perfectly! I made some changes to my original plan due to concerns about the CFM not being sufficient, so be sure to check out the updated link below. Unfortunately, I have not been able to test the efficiency of this filter yet since I haven't built my case, but I am confident it will do the job. Make sure you download the new files I uploaded, as I made a few tweaks before printing to ensure everything lined up properly. I designed a bracket and enclosure for attaching a 120mm fan, activated carbon filter, and HEPA filter to a 3D printer case for filtering ABS fumes. I've been searching for a model that includes parts sourced from Amazon and Home Depot, but so far none have met my requirements. Here are the parts I'm using: Fan: https://www.amazon.com/gp/product/B009OWRMZ6/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 Carbon Filter: https://www.amazon.com/gp/product/B000U204W2/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 HEPA Filter: https://www.amazon.com/gp/product/B0007INDN6/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 These parts are relatively inexpensive, and you can easily source any 120mm PC fan - I just chose this one for its simplicity in hooking up to a USB port for power. The "Inside Case Fan Bracket" would be placed inside your acrylic/Plexiglas case, where you would then cut out the 120mm fan hole in the acrylic and drill for screws. I'm using a router to do this part. The fan would sit right outside the case, attached to the fan bracket with #8-32 x 3/4" nut and bolt. The carbon filter would be cut to 96mm W x 60mm H and placed in the outside section of the fan duct, while the HEPA filter is the same size and would be placed in the HEPA filter bracket, with the gasket facing out. The fan duct and HEPA bracket would be fastened with #8-32 x 1/2" nut and bolt, providing a snug fit that applies some pressure to the gasket of the HEPA filter, hopefully preventing any leakage. (Update 12/28/2016: I used the long black screws and nuts that came with the fan to attach the fan, bracket, and duct to the plexiglass, meaning you only need 4 screws to attach the filter bracket.) The filter bracket allows for easy replacement of the HEPA and carbon filters without removing the fan or detaching from the case. The inside case fan bracket can also be used as a template for cutting the acrylic/plexiglas. In total, the HEPA filter, carbon filter, fan, and screws cost around $30. Print Settings: Printer: Maker Select v2 Rafts: No Supports: Yes Infill: 100% Notes: You can go with lower infill if you prefer; I just chose 100% to avoid wasting a day of printing. Supports are required for all but the inside case fan bracket.