For me it is my first design for A1 mini.

I needed to place the touch pen near the 3D printer and therefore designed a specific holder.

The Ø of the hole is 9.60 mm.

If I wanted to securely attach it to the A1 mini, I designed a holder with a recess so that it's easy to apply adhesive tape, for example from 3M adhesive tape. Please see below example.

I hope that this project of mine can be helpful to you.