What size are the springs. I keep trying to put them in, they then spring loose in random directions. Been trying to put them in for hours, most of the time looking for the last one that escaped. Doesn't help that I shake.

I think a different slider might do the trick. Do you recommend PLA, PETG, ABS, etc to print the new slider?

Filament is lined up. My part B looks nothing like your part B. It doesn't appear to be broken though. Did the 25 second thing. Still doesn't work. What else ya got? Electronically it is trying. The filament just does not cooperate.