This is an improved v2 design based on original design by PuTaTuo.

It utilizes off the shelf round magnets in the size of 4mm diameter and 3mm height instead of modifying original logitech round cover. There are three variants: 1: uses original design with direct dock design 2: this variant has many holes to save on filament making it lighter. 3: mini variant uses almost like square form factor instead of entire mouse coverage.