Grommet-on-Cable Overmold Generator

by MechEngineerMike, published

Grommet-on-Cable Overmold Generator by MechEngineerMike Mar 8, 2018
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I had a cable with two large ends that I needed to route through a box wall. Because the ends were large I was left with large holes to fill in the wall to support a rather small cable.

In the past I've solved this problem with a stepped grommet, but I wanted to try something with a custom fit. https://www.thingiverse.com/thing:2641325

This is an experiment I did to create a moldover grommet right on the cable. The files were created using openscad so everything is parametric.

To make a custom grommet you could directly 3d print one using flexible material. Though it is hard to print overhangs in flex and flex isn't cheap. Here is how to mold one:

  1. First you make a grommet positive (stl) using the file "cable grommet - Parametric".
  2. Second you open the mold generator file which cuts the positive grommet stl file out of a two part mold. This is what you print.
  3. Fill with putty and close mold & let dry.

Recommended Putty:
I've made high quality molded objects using silicone putty before, though your only color option is purple: http://amzn.to/2HglFyb

Shown in the picture above I tried using black hot glue because color was important. It can be done though you HAVE to use a mold release, I used chapstick. Surprisingly it works better with your hot glue gun set on low power/temp mode.

Print Settings






.2 or finer


doesnt matter

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Nice model and idea, thanks for sharing it. This would be a great application of the silicone/acrylic material shown in https://www.thingiverse.com/thing:2528764. That stuff turns out really nice and can be colored anything you want. I personally mix mine by squirting a few times into 10CC syringes. I have had good luck using 5 parts 100% silicone caulk to 1 part acrylic paint by weight.

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