30mm cylindrical doorknob gripper

for 30mm diameter cylindrical doorknobs with option to add a 8mm diapeter sunken bolt into the knob if wanted for some more rigidity.

idea was to make it easier for people with weak hands / arm muscles opening cylindrical rotatable doorknobs by providing it with more grip.

can be fastened using a self tapping screw (a pc casefan screw fits perfectly for securing it in place, is shown in attached picture of my print)

print with more wall/bottom/top layers for more structural support. or use a slightly higher infill than default.