FunX4 - Toolchanging 3D printer

May 12th, 2019
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Added some print tests pictures

Upcoming V2 : Toolchanger
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### Lock-system

E3D (that's the guys who designed the 'original' machine - i think they released it now, or it will be soon) reported that the servo of their beta printers was failing after 60k changes, so they switched to a micro stepper. I will follow their research/work and redesign my toolchanger to use micro-stepper too.
After some tests, i'll use a 24BYJ48S 2-phase mini-stepper, smaller ones need too much gearing, thus tool changing speed is reduced, and when it's 4 changes per layer it's a huge win to go as fast as possible.
Steppers have drawbacks too. At the moment i don't see how to use a stepper without some kind of endstop, and without risks of position loss at power down. It would be nice to do it the software way on the duet :) - servos are absolute positioning systems so i did not have the problem before.

### Alternatives for the lock-syste