Screwless Heart Gears
by emmett, published
UPDATE: If you lack a 3D printer, you can now buy these from CarryTheWhat at etsy.com/shop/CarryTheWhat.
The size has been increased a bit from the previous version to accommodate the printed pins, so it now measures 100mm across when assembled. Since everything is now printable, it should be easy to scale this design up or down as you see fit. At this size it took me ~6 hours of printing time on my TOM.
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Printed with blue glow PLA but the pins does not seem to fit?, i need to make them slightly smaller ?
Slic3r 0.9.9.64 is telling me "Warning: The input file contains a hole near edge 94.722260,100.376305,28.111151-94.265778,99.876762,28.801149 (not manifold). You might want to repair it and retry, or to check the resulting G-code before printing anyway." when trying to slice heartcenter.stl, and it comes out with most of the holes pretty well broken. Am I doing something wrong here?
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Plug the short pins into the holes on the small faces of the center block; plug the long pins into the large faces. Slide each gear onto its corresponding pin. I like to start at the top, because it's more obvious how the gears align with each other when you work your way down.
It's always difficult to calibrate a printer to make perfectly fitting bushings, but the good news is if your heart comes out too tight to turn nicely or so loose it's wobbly, all you have to do is make new pins. You can either regenerate them with different parameters from the scad file, or you can just take the existing pin file and stretch it as required in the various axes. This means the big prints won't be ruined by a miscalibration.
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