How to prevent the second extrudeur to hurt and unstick the printed PLA or ABS when printing litle things ?
You need to make sure they are exactly the same height (distance from the bed).
If they are not, the instructions on how to adjust them is on page 61 of the manual:
Also, if you're not currently using the second extruder, you can move it a little higher so it's out of the way.
Please request a firmware download via the Ticket System