Parametric Cap for Pointy Things

by seibert, published

Parametric Cap for Pointy Things by seibert Feb 13, 2011
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This is an OpenSCAD design for a rounded cap to put over something flat and pointy, like a knife blade. My wife ice climbs, and therefore owns a variety of sharp pointy objects without covers. Thanks to the Automated Build Platform, she now has two dozen little covers for each of the crampon points and covers for each of her ice axes.

Note that the design includes a small tab at the base that you can drill a hole into for an attachment cord. This will be used to keep all the crampon caps together in an elastic loop.


  1. Download CapGenerator.scad.
  2. Put in the dimensions for your sharp object. Note that some experimentation is required to get the narrow width parameter just right for a friction fit, if that is what you want. I find that I have to multiply the width by 15% to get something that fits after Skeinforge and ABS shrinkage interfere.
  3. Start a print, and abort it after it does the first 5 layers or so.
  4. Pop off the partial cover and slide it over the sharp object to make sure the fit is acceptable. Go to 2 if not.
  5. Print the full model.

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