M6 Conic Finger Nuts, Three Types with STL, STEP and FCStd FreeCAD source

To fix something around a screw rod
M6円錐形化粧ナット
穴のあいているものをネジの中心に固定したいときに使います

KnurledCone:    insert an M6 nut
DecagonConeNut: insert an M6 nut
DecagonConeM6:  already M6-threaded

Tube-shape support materials are initially
prepared in DecagonConeNut.stl and KnurledCone.stl.

After removing the support material, insert an M6 nut.

Materials and printing methods
Build Plate Adhesion: Skirt
Infill: 20-30%
Filament: PLA