Piezo + FFC Extruder Head Cable PCB

~~##Rev.E is incoming!~~

[*I've started over from scratch and built my own electrical design from the ground up. The new project can be found here*](https://www.thingiverse.com/thing:3343928)
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The new version has an onboard microcontroller to auto-calibrate on the fly, and a much more stable circuit with better filtering to prevent false positives.

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I'll be posting it in it's own listing, as Rev.E is less universal, and more geared to "Mendel" style Carte