Magic Screw for Makerbot
by VeryWetPaint, published
This is a 'kit' for designing or building magic screw threads that will (hopefully) build on a Thing-o-Matic and similar hobby printers. This should enable you to build a bolt and nuts so that one nut tightens normally while the other seems to turn the wrong way as shown in this video (this is the new model data):
The ancestor model did not build accurately on hobby-type 3D printers because (I think) the geometry had atypical overhangs that could foreseeably <i>flatten out</i> during extrusion. Instead of fighting those overhangs, this <b>Magic Screw</b> version tries to <i>exploit</i> them by building overhangs in straight lines between supported walls. It's just a conjecture (I don't know if I'm right) but it's illustrated in my blog at http://mysd300.blogspot.com/2011/12/magic-screw-for-makerbots.html
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Try building the three STL files as-is and see if they'll work exactly like the video.
If the model needs tweaking, or if you'd like to optimize the appearance of the trick threads, download and edit <b>bwbolt.scad</b> using OpenSCAD. Follow the instructions (comments) for some simple adjustments, or revise the whole thread profile as desired.
Be sure to share a derivative if you get a model that works better or looks better!