This is a storage case for an Irwin Unibit step bit with a screw top lid. The bit is 23mm at its widest point. It should fit any step bit that is 23mm or narrower.
Lid is embossed with “Step Bit” for identification.
Fusion 360 file provided for modification.
Printer: Ender 3 Pro w/ direct drive
Rafts: No
Supports: No
Resolution: 0.15-0.2mm
Infill: 15% or higher
Shells: 2+
Doesn't need support if printed standing up with the closed end on the build plate.
The author hasn't provided the model origin yet.