Custom butterfly knobs

Visit my latest creation, 100% customizable bracelets.

Customize the grip of your nuts and bolts

1. Main Configuration

This section defines the basic function of the part

• Grip type: Defines the shape of the nut's "wings"
  • Rounded wings: Classic aerodynamic shape and soft to the touch
• Number of wings: You can choose how many wings you want (from 1 to 24) Typically 2 (one on each side) or 12 for a circular knurled grip
• Center hole type: Determines what you will put inside the part
  • Nut: Creates a hexagonal recess in the base for a steel nut
  • Insert: Creates a calibrated cylindrical hole for a brass threaded insert (installed with heat)
• Nut size / Insert size: Select the screw metric (M2, M3, M6, etc) The model will automatically resize to maintain the perfect proportion
• Recess margin (Nut): This is the extra depth given to the nut recess so it does not sit flush with the surface
• Fit margin (Insert): Allows narrowing or widening the insert hole If the insert is too loose, increase this value
• Through hole: If activated, the screw can pass through the entire part from side to side If deactivated, the hole will be blind (the screw has a stop)

2. Manual Wing Adjustment

By default, the model calculates the wing size proportionally to the screw If you want a special and completely customized design, activate "Manual scale"

IMPORTANT: If you do not activate this option, manual changes will not take effect

• Wing length: How far the wings extend outwards
• Wing width: The lateral thickness of each wing
• Wing height: The vertical height of the wings
• Extra body height: How many millimeters the central cylinder protrudes above the wings
• Wing offset: Allows moving the wings closer to or further from the center
• Chamfer factor: Controls edge smoothing A higher value creates more inclined and smoother edges; a value of 0 leaves sharp edges

3. 3D Printing Tips

1. Orientation: The model is designed to be printed with the flat base resting on the bed (hole facing up)
2. Infill: A minimum infill of 20% with at least 3 or 4 walls (perimeters) is recommended to ensure the part withstands manual tightening force without breaking

4. How to install the nut or insert

• If you chose Nut: Once the part is printed, insert the hexagonal nut into the base recess If it's too tight, you can use a screw to pull it in
• If you chose Insert: Place the insert over the hole and, with the tip of a hot soldering iron, press gently until the plastic melts and the insert sits flush The plastic will solidify around the insert's knurls, permanently fixing it