by schlem, published
One of the small frustrations in my life is the lack of captive nuts on the bottom of a printer bed. Leveling the bed is a crazy-making two-handed test of manual dexterity: a wrench in one hand and a screwdriver in the other, and various bits of inconveniently positioned bed hardware.
I thunk to myself: "What if I had a tiny wrench head I could glue in place?"
The OpenSCAD routine takes a parameter for the nut size, in mm, across the flats. If you still live in Imperial Land, you can avoid all that nasty conversion math here: http://mdmetric.com/tech/cvtcht.htm
In the Customizer, you won't see an apparent size change as you scale it larger or smaller. Trust that the STL generated will be an appropriately-sized Nut Leia.
If you don't have your digital calipers handy, you can get a measurement across the flats of your favorite SAE nut here:
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Originally, I added two square tabs on each side of the nut trap to increase the surface area of the glued bond, and to decrease the strain on that bond by adding some lever arm. The shape evoked a familiar, beloved silhouette. A minor modification and Princess Leia Organa was reproduced in miniature.
I used super glue and (quickly) slid it into place around the target nut. Voila! One handed bed leveling!