Id got the firmware working well now. Ive got super smooth prints now.

(Check under project files the archive with the firmware)

Next step is to interface the led bar and lcd display of the printer.
If some of you want to already mod their printer.

Id replaced the X carriage with the following:

https://www.thingiverse.com/thing:594392

Im using the original PSU included in the printer yet, because i have to replace the bed fuse to be able to use 24V.

For the stepper drivers im using the following from Watterott:

http://www.watterott.com/de/SilentStepStick

ATTENTION: Youll have to cut the pins on CFG1-2 to enable SilentChop.

http://reprap.org/wiki/TMC2100/de

Id replaced my printer bed because id broke mine....

https://www.amazon.de/gp/product/B00ZG0DXOY/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

Its just the standard mk3 alu heat bed.

Ill will post photos and chematics when im ready with the lcd display and led bar.

(Ill have to find the currect adapter for the lcd cable....)