This device shuts the Ender 3 off automatically at the end of a print.

How it works: The printable clip accomodates a limit switch. As is printbed is moved in the full forward position at the end of a print, it will hit the limit switch and thereby interrupt the 24V supply.

Please be aware that:

• This device does NOT turn off the powersupply itself as additional precautions would have to be taken when installing a relay on the AC mains side.

• This device shuts off the printer without delay, thus there is a chance that remaining heat will creep up in the nozzle (I have not encountered that problem so far).

• This device mainly exists for ease of use. The limit-switch just clips on and can be used whenever desired without any changes to the G-Code.

You will need (AliExpress links):

• Micro Limit Switch with Handle

• DC 24V Latching Relay Module with Bistable Switch Control

• XT60 bullet Connectors

• Wires, soldering iron etc.

Note: You can also build a latching relay using a 555 Timer (as I have done). I have a little schematic on how I did that (sorry for the rather poor quality). You will need a step down converter from 24V to 12V as the 555 Timer cannot operate on 24V.

If you have any questions, please let me know in the comments.

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Last edit: 30/12/20