65mm spindle magnetic interchangeable dust boot
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I couldn't find a dust boot I liked, so I made my own. This has the possibility for multiple printed bristle lengths.
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- Creative Commons — Attribution — Noncommercial
UPDATE 16.6.2025:
So I had issues with the 3mm magnets. I upgraded them to 5mm magnets, and that allowed me to remove 2 of them on the top and bottom part of the boot, for an even 10 on each part.
I also increased the hole diameter on the bottom part as I had to re-drill mine for the 4mm pins to slide in and out easily.
Description:
I couldn't find exactly what I was looking for when I made my CNC. I have a 1.5kW 65mm spindle that can fit large (and long) bits as well as small ones, which I use regularly.
Here's what I came up with, with the top & bottom parts to print in PLA/ABS/PETG (something hard), and the bristles to be printed in A95 or harder flexible materials, I used TPU. The bristle “brushes” are 0.2mm thick. That's your layer thickness for this print. I printed multiple bottom parts, one to match each bristle length.
The top part clamps to the bottom of the spindle using 2xM4 screws & nuts, with washers and use some green or blue thread lock! Things vibrate.
These are the 70mm long bristles: the thicker edge is to clamp them in the groove on the bottom part.
I was originally using rectangular 5x10mm magnets, but those were prone to breaking on insertion, so I swapped them out for 3x2mm round magnets.
For alignment, there are 2x4mm dowel pins to insert in the top shoe, and the bottom part should just slide into it - there's a chamfer to help:
Takes a few magnets to guarantee they'll hold in place, but since the top is used to hold the vacuum's 38mm ID hose, it needs a bit of holding power to be worthwhile. The hose is just hot-glued onto the lip of the top part. Makes maintenance easy, while giving appropriate holding power.
To put in the magnets, 2 things to watch out for:
- make sure you get the right orientation. If you're doing multiple bottom parts, make the top part first, then put the magnets to insert on the top part sticking out, to press them together. You'll save yourself head- and heart-ache.
- Either heat the magnets or put a drop of superglue in the holes before inserting the magnets in. You don't want them to slide in easily. I sized for 3mm knowing that there's usually 0.1 to 0.2mm tolerance on those based on the coating, and that means they'll be properly press-fit into place.
Enjoy!