The ultimate, fully customizable Hex Bolt and Nut Generator for FDM 3D printing.
Stop searching for the exact screw size you need. This professional OpenSCAD generator allows you to create perfectly toleranced, instantly printable hex bolts and nuts directly via the MakerWorld Customizer. Engineered for maximum mechanical strength, flawlessly smooth threads, and a clean industrial aesthetic. No external libraries required.
⚙️ Core Features:
100% Parametric: Instantly adjust thread diameter (M3 to M30+), thread pitch, shaft length, and head dimensions.
Tolerance Control: Features a dedicated tolerance parameter to compensate for material shrinkage (PLA, PETG, ABS). Your printed nuts will thread onto your bolts perfectly straight off the build plate.
Support-Free Geometry: Optimized 45-degree chamfers under the bolt head and at the thread start eliminate the need for supports and prevent "elephant foot" binding.
Mechanical Integrity: Designed specifically for the layer lines of FDM printing to ensure high shear strength and robust torque resistance.
🖨️ Optimal Print Settings: For maximum durability and smooth thread engagement, please use the following slicer settings:
Layer Height: 0.12mm or 0.16mm (Crucial for high-resolution threads).
Walls/Perimeters: Minimum of 4 to 6 walls.
Infill: 30% - 50% (Gyroid or Cubic).
Orientation: Print bolts vertically (head flat on the build plate). Print nuts flat.
Supports: None.
Material: PETG or ABS/ASA recommended for load-bearing applications. PLA for general use.
📐 How to use the Customizer:
Open the MakerWorld Customizer.
Select your desired metric standard or enter custom values.
Adjust the Thread Tolerance if your printer tends to over-extrude (start with -0.15mm for the bolt and +0.15mm for the nut).
Generate and download your tailored .stl or .3mf file.
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