I recently made a fan mount for my Jhead out of color change ABS and realized that it would start changing color after the hotend hit 170 or so, it was the heat working its way up the peek tube. The ABS is supposed to change color at 80f.
Do they make color change ABS that changes color at higher temps? My thought is using it as a temp monitor, like putting a ring of color change ABS on stepper motors to monitor if they are getting hot. Or like my fan mount, watch for heat moving up the hotend.