I bought a pen for my Ipad from Aliexpress and wanted to attach it to the Ipad with a simple and comfortable method.
This system works really well, and It's fast to mount and dismount the pen.

The only thing that you need is an elastic band of 15 mm wide (0,6 inches) and sew the ends once achieved the tension you want.

The pen I bought from aliexprees is this one: https://www.aliexpress.com/item/4001176190861.html?spm=a2g0s.9042311.0.0.72b14c4dKn9DwH

The diameter of the pen for this design, should be 9,8mm or won't work.

Here you can watch how works:

https://youtu.be/eCJ-fu326O4

Prusa

I3 MK3S

No

No

0.2

15

With smaller resolution you can achieve better round extreme.