Simple Snap-Fit Joints Library

thingiverse

This is a simple snap-fit joints library based on "Snap-Fit Joints for Plastics - A Design Guide" by Bayer MaterialScience LLC. http://fab.cba.mit.edu/classes/S62.12/people/vernelle.noel/Plastic_Snap_fit_design.pdf The main idea is to correctly dimension the snap-fit joints according to the elongation at break that can withstand. - The global variable eps defines the material, for example PLA has an eps value of 0.03 and ABS has an eps value of 0.06. - The dimensions are based on the Design Guide, but for simple cantilever snaps it is also possible to define h or y as shown in the figure. - For ring snaps, the values of K2 or K1 can be taken from Fig 10 of the guide, but a default value of K=2 should be okay. I have added some simple examples of using the library, and I have also printed the cable clamp, which works well. It is suggested to print snap-fit cantilever on the XY printer plane. New version: 0.36 Added SnapHoleY module Bug Fix: 0.35 Based on shanemgrey's reporting, on RSnapY I added a check to avoid interference of lobes during closure, and on RRSnappY I added a check to avoid overlapped lobes. The snapLib.Example files have been updated. New version: 0.30 Added scale factor f to reduce calculated values h or y (this keeps the snap in the unbreakable zone when f>1) Added functions Hsnap and Snap to calculate the snap H or Y for cantilever snaps, useful for defining snap bores