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Here is a more robust single channel relay box. I wanted to have Octoprint control the psu of my 3d printer through a relay and found existing single channel relay boxes to be severely lacking. This one has been designed for 3d printing, is heavier duty/thicker, is able to securely clamp the cables down and has a lid that snaps down with clips that don't instantly break off.

Supplies Needed:

4 x m3 x 10mm thread inserts
4 x m3 short bolts for screwing the relay board down
4 x m3 bolts for clamping the cables down
1 x 5v relay module here: https://www.amazon.com/dp/B00LW15A4W?psc=1&ref=ppx_yo2ov_dt_b_product_details

My printing settings:

.6mm nozzle
.36mm layer height
3 perimeters
20% infill

The initial tutorial I followed for this was from here: https://www.instructables.com/PSU-Control-With-Octoprint/

The box provided in the tutorial is unusable. It's not designed for 3d printing at all and is not able to safely hold the cables or board in the box.

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