Custom Socket Head Bolt Cap

This is a parametric, customizable cap for socket head bolts (e.g., DIN 912) designed for FDM 3D printing. The cap features a clean, flat

top with optional top and bottom fillets for a polished look. It includes a hollow insert that fits snugly over the bolt head — perfect for covering bolt heads in visible assemblies, protecting from dust, or achieving a finished look.

You can easily adapt this design to fit bolts of various sizes by adjusting the variables in OpenSCAD.

Parameters Explained:

Variable	Description
insert_outer_diameter	match this to the bolt head diameter plus a small tolerance. (s)
insert_inner_diameter	Inside diameter of the insert (insert thickness = insert_outer_diameter - insert_inner_diameter).
insert_height	Height of the cylindrical insert. Should match the height of the bolt head. (t)
top_diameter	Diameter of the flat cap on top. This can be larger for better coverage or aesthetics. (dk)
top_thickness	Thickness of the top cap. 1.5–2 mm works well.
tolerance	Clearance added to the inner hole to account for printer tolerances. Typically 0.2–0.4 mm.
fillet_height	Height of the bevel (simulated fillet) on top and bottom edges. Makes edges feel smoother and look cleaner.

Print Settings:

Recommended Material: PLA, PETG, ABS
No Supports Needed
Layer Height: 0.2 mm or finer for smoother top
Wall Count: 2–3 for strength
Infill: 10–20% is sufficient

Descrição

Parameters Explained:

Print Settings: