If the axle-lock button on your Dremel 8000 has broken, like mine, you can use this to print a replacement, as the existing one is too flimsy to glue.
(Ignore the residue glue and messy top layer, I care little about looks on a functional part like this)

Slightly beefed up to make up for weaker 3D print layering compared to the original. Comes with Designspark Mechanical RSdoc so you can modify it.