Needed to post process some round things from the inside and the outside and really didn't want to do it by hand. So I've printed this little thing, added a 3mm welding wire as axis and glued some stripes of sand paper to the thing. Combined with a drill and it really saves some work and made sanding much easier.
Because the drill and the thing moves enough air / blows against the target, I didn't had problems to dry-sand PLA.
WARNING: I tried it for some minutes and low sped with a Dremel and killed the Dremel with it. Either it was a not so happy coincidence, because my Dremel is 2.5 years old or the Dremel can't handle the load. So - don't try it.
Printer Brand: Prusa
Printer: i3 MK3
Infill: 15% but 3 to 5 perimeters
Filament: Das Filament PETG Leuchtorange