Ergonomic handle for bits with rotating disc

First print test piece to ensure proper tight tolerances of bit and M4 screw. You can use glue, but it is much better to use snug fit and taping into plastic via M4 screw.

I used PETG and it is plenty durable.

BOM:
-1x 624zz
-1x M4x35mm (max height)
-1x M4 nylock nut
-1x M4 nut
-4x M2x8mm philips head screw

It is worth mentioning that you do not necessary need 4x M4 screws as you can simply glue pieces together.