About this 3D model
A bit holder for 10 standard size 6.5mm bits. Has a hole for attaching it to a split ring and spots for 5 4mm diameter and 2.8mm high disc magnets which can be purchased very cheaply from aliexpress. Plugs wer created with very little clearance to allow for a secure friction fit to avoid reliance on glue. If you run into issues, scale the two axes with the interference layers down. Print 5 of the plug pieces.