I created a simple Honeycomb Storage Wall holder for my Subay rotary tool handset. Several brands of rotary tools (for estheticians, dentists, hobbyists, etc.) use the same handset, so please check yours to ensure that it is the same size. The main barrel is approximately 23.7mm in diameter. Mine drops in effortlessly and stays very securely.

I printed it upright, with supports. At slow speeds with appropriate filament, you may also have luck printing it with the front side down and the inserts pointing up. Post in the comments if you have any recommendations.

If you only need one insert, you can modify the STEP file or delete and reposition connectors in the 3mf file.

Connectors were remixed from Justin Yu's “Complete Edition," which was remixed from KYZ Design's HSW upload… etc. etc. etc.

Enjoy!