Improved Small sanding or polishing disk for a handheld drill

This design is a further development of my model 646358.

Sometimes  I need to sand or polish a small area. I don't like to prepare then my belt or vibration sanders. That is why I designed this very simple flexible disk to be used by a handheld battery drill or screwdriver. It will accept standard 50 mm pads with a soft velcro back as sold in my local hardware store.

Thanks to a flexible joint and the springs added it will stay parallel to the surface. 

It is best to start by placing the disk on the surface to polish and then slowly start the rotation. If you start the rotation first you risk creating round scratches on your surface!

In case the spring is to strong, I added a Version 2 spring that should be less strong (not tested yet)

Printing is easy. I used PLA. PETG might be a bit stronger and/or less brittle. 
I printed with 0.15 layer and 15% 3D honeycomb infill.

Assembly is also easy. Start with the main disc. Assemble the connector with a piece of filament to the base. Put the springs in the disc. Move the ring over the shaft. place it carefully on the springs, and put 2 small pieces of filament in the small holes.

For the flexible joint you can use pieces of filament. The hole in the “connector” is 2.1 mm diameter and should be OK. The other holes are designed to be 1.8 mm and might be a bit tight because of printing deformation (is a horizontal hole). When necessary you can ream it with a 1.8 mm drill. It is best to glue the filament pieces in the forks to secure them in place.

Assembly is also easy. Start withnthe main disc. Assemble the connector with a piece of filament. Put the springs in the bottom. Move the ring over the shaft. place it carefully on the springs, and put 2 small pieces of filament in the small holes. I also suggest to use some glue to secure the springs.

When ready glue pieces of velcro (part with the “hooks”) on the disk to hold the pads in place.

I wish you happy sanding. Please let me know when you print it.