A fid intended for splicing 3/16 - 1/4" (4.7 - 6.3mm) synthetic winch cable. Buttress supports are included for a vertical print orientation. No additional supports are needed. Overall length is about 140mm. The fid is hollow for approximately 100mm. The internal volume terminates in a cone shape similar to the exterior.
Printing with a wide brim is suggested for better stability. I specified 4 walls & 49% infill. Post processing should include trimming off the buttress supports, filing or sanding off the nubs and overall sanding for a smooth finish.
A 5mm hex driver makes a good support for sanding.
The author hasn't provided the model origin yet.