Really liked the original use of the GL2103 HEPA filter into a 120mm fan solution. In trying to adapt the first set of files, it didn't work well, so I went to OnShape and re-drew everything. This is very handy to say the least! I used 15mm x 1.7mm round magnets from Amazon, put the pieces together snug. Made in Geetech black PLA to keep it simple and inexpensive to build. For the Bambu Lab X1 and X1-C, the magnets stick very well in the back over the opening for the chamber exhaust fan. Enjoy!