December 30, 2025
Description
These are DIY strut channel nuts for half-height strut channel. That is, struct channel measuring 1-5/8" wide x 13/16" tall. This includes a spring to hold them in place. These are made for 1/4"-20 hex nuts, and typically use ¾" long bolts.
This is version 2 - stronger and more reliable than the original strut channel nut. The key difference is this model has another part: a block that prevents breaking from over tightening, while also strengthening.
do not use these for structural loads. Even though these are quite strong, the strength comes from flexing the plastic base. Use for light duty only.
do not use PLA. PLA creeps under constant pressure.
For the springs, PETG.
For the Body - PETG works too. ASA/ABS may be better. CF filament is the best I tested.
Do not print this with default print settings. It will result in a weak part. I did a lot of testing and optimized the print parameters for strength: see the original strut channel nuts model description for details. Use my 3MF file, or print with these settings:
print the body face down, print springs on the side, print block on the side with tear drop hole facing up. no supports are needed.
1 wall loop ← yes, you read that correctly.
100% infill. This is a must.
Infill: Aligned Rectilinear at 90 degree angle (lengthwise of the body)
top shell layers: 1. top shell thickness: 0.2mm .. this results in maximum layers as pictured below
Slow Inner + Outer wall speed down (on Bambu printer at least)
Wall generator: Arachne
The main body takes all the force of the nut. In your slicer, the base of the body (under the nut) should look like this:
License:
Creative Commons — Attribution — Share Alike
Glen Bayley
