Magic Screw for Makerbot
by VeryWetPaint, published
The ancestor model did not build accurately on hobby-type 3D printers because (I think) the geometry had atypical overhangs that could foreseeably flatten out during extrusion. Instead of fighting those overhangs, this Magic Screw version tries to exploit 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 mysd300.blogspot.com/2011/12/magic-screw-for-makerbots.html
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Edit the SCAD file and make yourself a derivative! You could make the bolt as long as you like. While you're at it, try to improve its appearance or build-ability. I don't own a Makerbot, and my SD300 printer is immune to overhang issues, so I can't do any more tuning for Makerbot users.
I easily rotated the bolt in Simplify3D Creator. I accidentally printed this out with supports. Luckily, it didn't produce too many blocks, and I was able to cleanly remove them. Great! Fits absolutely perfect. My only request would be that the bolt be longer so that there is more play area to work with.
Printed perfectly on my Tantillus RepRap printer. :)
My only mistake was slicing the bolt with 15% fill the first time. It looked great, but the thread shaft didn't have a strong enough bond to the bolt head so it broke off when I tightened one of the nuts a bit too much. Reslicing/printing with 50% fill for the bolt fixed the problem completely.
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If the model needs tweaking, or if you'd like to optimize the appearance of the trick threads, download and edit bwbolt.scad 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!
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