I tried out this Nano Bracket - Bike Tube Strap Bracket to hold my Crank Brothers M19 Bike Tool. It worked, but wasn't quite right for the velcro I have on hand, plus I needed more fastener clearance. This design is 100% mine from scratch, but inspired by the Nano Bracket, so I wanted to give credit to @brianpark_365460. Thanks!
The mount was designed for a CrankBrothers M19 multitool in its case. I wrapped a section of bike tube around the case and used velcro to secure. It requires two M5 flathead cap screws to work with the countersunk holes. There are counterbored holes on the frame side since my bike has rivnuts which are proud of the surface.
Printed @ 0.20mm layer, 4 perimeters, 25% grid infill. Support under velcro pass-through for best fit to allow adjustment. Fastener holes have a thin bridge layer to punch through to eliminate support.
The author remixed this model.