Customized version of: https://www.thingiverse.com/thing:4071

Designed to fit the following relay module: https://smile.amazon.com/gp/product/B07L6JXGXV

Instructions

Wanted to add a relay to my Ender 3 after an incident occurred where the control board crashed, causing the heaters to get stuck on at full power. I made this to hold said relay.