Filler Roller without supports (using M3 nuts and bolts)

Requires 2x M3 nuts and 2x M3 Button head bolts (min length is 16mm, no upper limit since it just goes into the body of the roller)
need to print 1 roller and 2 pins
might need to clear cutouts of any bridging artifacts with tweezers if necessary

since the area of contact is quite big, small cutout like this has no effect on part functionality