By request, here are a bunch of small sanding block tools of various profiles intended for getting into tricky spots in small-scale sanding and polishing work. The tools are 20mm wide and feature a bolt on each side for tensioning and retaining a sandpaper strip. Happy sanding! :)
You might also like these free designs!
Mini Craft Mitre Box: https://www.myminifactory.com/object/3d-print-73745
Mini Craft Corner Clamp: https://www.myminifactory.com/object/3d-print-74993
Mini Craft Clamp: https://www.myminifactory.com/object/3d-print-75154