So with the rig all setup I got to testing...and as suspected after the resistance test, they make a better resistor than a fuse.

The hollow fuse allowed the most amperage through, but even at over 30 volts I barely got the led on the drill to turn on, let alone make the drill turn.

Just for fun I tried hooking this up in line with my battery on my pickup while starting using some jumper cables, and still not enough to make a meaningful impact on the fuse, or start the pickup.

I tested the resistance again after leaving it hooked as a ground short on the pickup battery, and while the fuse was not warm (but not cold either), the resistance had increased to just over 600 ohms. It seems that with enough voltage or duration, the fuse heats, and resistance increases with it. With a doubling of resistance within a temperature range I could not even feel, I can only imagine how high the resistance might get if truly heating up.

Now the more interesting piece of this is that the conductive PLA does make for a decent resistor, and if you got your design dialed in well, you could be pretty consistent in the resistance. I could see easily printing resistors for LEDs, buzzers, and a number of other small projects.

Video available at https://www.tiktok.com/t/ZTH3RtNxVDanW-ZAYRm/