A box to hold switch and fan connectors to allow switching between 3D printing and Laser engraving. The switch is a SPDT ON/ON switch .
A JST 2 pin connector is mounted on the top to allow unplugging the laser engraver if you want to .
Use T Nuts to connect the box to the side rail of the printer
The common pins of the switch are used to connect a 2 pin JST plug to the motherboard. FAN JST socket.
One set of switch pins connect to the top mounted socket for the laser.
One set of switch pins connect to 2 pin JST socket to connect to the fan plug .

Creality

Ender 3

No

Yes