Dust Shoe Attachment for bristles

I really liked the original design and tried using it with my CNC but the TPU bristles weren't holding enough in. I recreated the attachment in fusion and modified it to allow “standard” CNC bristles. The ones I ordered from Amazon averaged 5.2mm thick at the top weaving, after a test rig to determine the optimal slot opening size for a press fit, I chose a 4.5mm slot for the brush. Most of the brush weaving fits perfectly but some areas were snug and required additional effort to insert. All of it went in though with no damage to the print. For my print it needed exactly 300mm of bristles so the pack I bought should allow me 3 attachments. Why 3 you ask, well if you look at the images you see the bristles are long and as is “stock” it's the perfect length for my long bits. I've printed a second attachment where I'm cutting down the bristle length so that it works with my shorter bits. The remaining bristles with either be a backup piece or another custom length one if I find I need it. I also added some small 3.2mm holes in the magnet cavity to allow removal of the magnet without damaging the print in case you insert one backwards. Should be a good size to stick a M3 bolt through or similar to push the magnet out.

I included 3 files, the 2 STL files are the attachment and a separate file for supports inside the brush channel. The supports are not strictly necessary and many printers will likely print the channel just fine with no supports but it's there in case someone needs it. You will need small supports under the magnet cavity though. I also included my step file for those who might want a different need or approach. 

Added the ability to insert over the counter CNC bristles as well as holes in the magnet cavities to allow removal of magnets if they were inserted backwards.