Ender 3 NG v1.2 toolhead accessory cable mount and breakout for Klicky probe

This is a toolhead accessory cable mount and breakout the includes a configuration designed for using a Klicky sensor. I included connectors for every toolhead accessory, including the extruder and hot end heater.

The hot end heaters can take quite a bit of current. JST XH connectors are designed to carry 3A per pin, which is 72W at 24V. A lot of hot ends demand more power than this (like my Volcano ACE), so I am using a 4-pin connector for my hot end to split up the heat and ground pin in parallel. On paper, this will make this connector support 6A, or 144W.

I also made a little cutaway under the cable mount to allow the cables to run directly behind the mount to the backs of the connectors. Please note that this part is custom to this breakout, and will not fit the original Ender 3 NG v1.2 breakouts. If you want to use this shroud with original breakouts, see this version here .

Heads up that there is a very narrow gap between the toolhead base and the breakout. Additionally, since the back of the JST XH connectors are sharp, it's possible to stab the pins into the wires and cause shorts as this breakout is installed. To avoid this, I recommend cutting the XH pins short (perhaps 2 mm from the back of the connector), and ensuring that wires don't cross between the upper couple connector rows on the breakout. It also helps to use thin wires for parts that don't require high current, like the fans, X stop, and Klicky probe.

Here is the arrangement that I recommend using this breakout. It wouldn't be a bad idea to print this and attach it inside the electronics panel somewhere for reference.

If you use some transparent sticker paper (like this ), you can get a really nice diagram attached to one of your stepper motor cooling ducts.