A couple of days ago I decided to smarten up my Prusa, by covering the exposed threaded rods with plastic “loom tube” (available locally from Jaycar). The 7mm variety fits nicely over the 8mm threaded rod, and also over the Z stepper motor wiring, as you can see in the photo on the left.
The red twisted plastic stuff came with the kit, and Jaycar calls it “spiral binding” and only sells it in black. I’m using it to tidy and brace the extruder motor’s wiring.
While doing this prettification, I broke one of the leads from the nozzle thermistor to its tiny Molex plug. Oops. By special request of Gary, here’s a photo showing how I fixed it.
Yes, I just pulled the remaining lead out of its crimp, and plugged both leads into my last remaining piece of screw-terminal block. Then I pulled the black and white leads out of the matching Molex connector and plugged them in opposite the thermistor leads. Problem solved.
Note that I’ve left two spare screw terminals attached, next to the thermistor leads. That is so that if/when I break a lead to the nozzle heater (the red and green wires on right of shot), I can do the same replacement with them.
In the back of my mind is a plan to redesign the extruder mount so there is some place to firmly attach the terminal block, so there is no lead flex on the thermistor or heater.
Why didn’t I just fix the original connector?
Turns out that getting the crimps out of the tiny Molex connectors used for the thermistor and heater is next to impossible without a special tool from Molex. It is not expensive, but it is not in my toolbox, either. Thanks to Sonny on the MakerGear Google Group, I now know about the tool, and how to use it, but I’m still happy to have a repair that I can do with stuff available locally.