I had a roll of sandpaper, I needed a drum sander.
My design was inspired by Miklosicza's model https://www.printables.com/model/619813-sanding-drum-for-angle-grinder, but fits the sandpaper and hardware I have available.

Note: FreeCAD model is included and can easily be modified to fit your hardware.

Hardware Needed:

• M8x100mm screw

• M8 nut

• Sandpaper

Recommended Settings:

• PLA is not recommended as the drum will get hot in use. I used PETG.

• No supports needed, just a bridge.

• Extra perimeters.

• Use random seams and scarf joints to avoid a 'bump' in the drum.

Assembly:

1. Print the model parts

2. Remove the thin bridge covering the hole and tightly fasten the screw and nut.

3. Measure your sandpaper to fit, either with ✨maths✨ or by inserting one end, wrapping it around, and marking the required amount.
   (For this 38mm drum, you need 125-127mm of paper)

4. Cut the sandpaper carefully, be sure to make the cuts straight and at a right angle.

5. Wrap the sandpaper around the drum, pressing the ends into the notch.

6. Insert the wedge, then press or hammer it in until flush.

Best of luck!