Push-On-Push-Off Switch Bracket

This is a bracket for holding a push-on-push-off switch to the vertical rail of an Ender 3, so that the gantry can activate the switch when you move Z to 220 mm height.

Used in conjunction with an external relay controlled power block to enable an auto-shutoff at the end of printing.

Using the POPO switch instead of a simple microswitch avoids the issue of the printer turning itself on again after powering off, if the gantry falls back off the switch.

This is the switch I used:
allelectronics.com/item/mpb-176/mini-spdt-push-on/push-off-switch/1.html

The bracket has a slot for a 4.5mm T-slot bolt and nut to affix it to the rail.

See this YouTube for the original auto shutoff design by CHEP
https://youtu.be/_dvHjjSTGZk