This fully parametric generator allows you to transform any standard hex-headed bolt into a comfortable, professional-looking thumb screw.
By using MakerWorld’s OpenSCAD Customizer, you don’t need any CAD skills to create a grip at the size you need for your specific use-case (or for whichever bolt you happened to have available). Simply input your bolt's dimensions, choose the density and depth of your grip texture, and the size of the grip head, and the model will generate a precision-fit housing that clicks tightly into place. With a hammer.
Customisable Parameters
- Bolt Size: Input the exact width and depth of your hex head (I find these vary even within the M-specifications so it's best to use your caliper or a ruler to calculate the diameter and depth of the head).
- Grip Diameter & Thickness: Scale the knob to fit your hand or the tight space of your project.
- Texture Profiles: The design of the knurled grip can be adjusted quite significantly by setting the depth and thickness of the grooves as well as the density of the pattern..
- Tolerance Offset: Adjust the tightness based on your specific printer’s accuracy to ensure a perfect press-fit.
Why This Design?
- No Supports Needed: Engineered to print cleanly on any machine
- Zero Hardware Required: The design relies on a precision friction-fit. No glue or secondary fasteners are needed to marry the bolt to the grip, though I have included small, raised tabs that you can heat smear over the head of the bolt once it's in if you would like to make it permanent (I find a Dremel Versatip works well whenever I want to use that method).
- Infinite Reuse: One model essentially provides you with every thumb screw you will need for future jigs, tripod mounts, or enclosure doors.
How to Use
- Measure: Use calipers to get the flat-to-flat width of your bolt head.
- Customize: Click the ‘Customize’ button here on MakerWorld and enter your dimensions.
- Generate & Print: Download your unique STL or 3MF.
- Assemble: Place your bolt head on a hard surface and press the printed grip down onto it and, if it's as tight as it should be, hammer it in the rest of the way.
Designer's Note: This model is designed with the environmental-led approach that I incorporate in as many of my designs as possible. By eliminating the need for supports, it significantly reduces filament waste and print time. Additionally, by using common local or existing hardware and scraps, you reduce the carbon footprint associated with shipping specialised parts. I'm not expecting a Nobel for it but I believe every marginal gain helps and 3D printing is, counterintuitively for some, an amazing way to localise production and reduce environmental impact.
Haus Sparrow
