A customizable OpenSCAD model for creating protective covers that fit over hexagonal nuts. Perfect for covering exposed nuts on furniture, machinery, or any project where you need a clean, finished look.

• Fits any hex nut size (default 30mm across flats)
• Choice of spherical dome or flat top
• Adjustable height, wall thickness, and clearance
• Optional fillet rounding on flat tops
• Hexagonal cavity at bottom with chamfered entry for easy installation

PARAMETERS:

NUT SIZE SELECTION:

• nut_size - Select from M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24, M30, M36, M42, M48, M56, M64, or CUSTOM
  • Standard sizes automatically set the correct dimensions based on ISO 4032/4033

CUSTOM NUT DIMENSIONS (only if CUSTOM nut_size selected):

• custom_flat_to_flat - Your nut's size measured across the flats (mm)
• custom_nut_height - Thickness of your nut (mm)

COVER PARAMETERS:

• extra_height - Additional height above the nut (default: 3mm)
• top_style - Choose "flat" for flat top or "sphere" for spherical dome
• top_fillet - Rounded edge radius for flat tops (mm, default: 1mm)
• wall_thickness - Adjust strength vs material usage (default: 2mm)
• clearance - Fit tolerance around nut; increase for looser fit (default: 1mm)
• chamfer - Entry chamfer at bottom opening for easier installation (default: 1.5mm)

Originally made for toddler's safety and covering protruding parts of pipes.

Here's a size guide for reference: