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Parametric Snap Pins

by emmett, published

Parametric Snap Pins by emmett Dec 26, 2013
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Summary

These new snap pins are meant to address the deficiencies of my previous pin library. These are much easier to insert, more tolerant of different printer calibrations, and stick better to the build platform.

You can include this library in your OpenSCAD designs, or use customizer to export pins and holes for use with other programs.

UPDATE: I added thin fins to the holes, which create slits when differenced. These fool slicers into making webs that strengthen the conical end of the hole. They greatly improve strength for vertically-oriented holes, and can be turned off in other situations if desired.

Instructions

You can make either free or fixed holes, to allow rotation or not. I always recommend greasing the pins (I use white lithium grease, but I'm sure almost anything would work). It makes them easier to insert and remove, and allows them to turn much more freely without squeaking.

The only part of these pins that are meant to fit tightly are the ends of the snaps. Since these parts are flexible, they work with different printer tolerances. All rigid parts of the pins are significantly smaller than the holes, ensuring ease of insertion.

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Comments deleted.

http://www.thingiverse.com/thing:726986 uses this pin and socket. It works great, but I needed to add a brim to the pin in the slicer to get it to stick to the print bed when printing.

1x2x3 Rhino puzzle
by joefe

Can you separate the file into pieces? Thanks!

Could you add a double pinhole? I'm using pegs to align 2 adjacent faces so the back to back pinholes need to be perfectly aligned.

Is there a compelling reason for the pins to have points on the ends? I was having trouble with the plastic curling up at this thin section, so I modified the STL to have snub noses. No more curling, and the fit and operation was the same as before with no filing the curved points off. (Think the tips of elf shoes!)

Love these pins. One problem though: I want to use them for something and need a length shorter than 13mm. If you enter in a length < 13, the pins do not work in OpenSCAD. I tried scaling the whole thing down, and the pins are to flimsy. Is there a way to keep the pin the same radius, but shorter?

Ahhh! That makes so much more sense to have increased springiness and improved guidance!

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