1/4" Strut / Unistrut Channel Nut (V2)

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.

Note:

• 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.

Important:

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: