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Hey :) Sorry for the long wait. By installing the extension cable I accidentally fried my extruder stepper driver on the mainboard, so I had to install a replacement mainboard aswell. ^^ Anyways, its all up and running again.
I bought these ones: https://www.amazon.de/gp/product/B073VK7QPC/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
They are standard HX 2.54 4-to-6 cables. The length of 1m fits perfectly now, its enough for the full X- and Z-range.
BUT...(and you've been officially warned now ;) ) watch the polarization of the inner two cables! When you order the cable, its wired up as follows:
A--A
B--B
C--C
D--D
The Ender 3's stepper however needs it like that:
A--A
B--C
C--B
D--D
So you have to fiddle out the inner two connectors of one end and switch them! I thought those cables were standardized and plugged it in as received which wasnt a good idea... The stepper then only did a little wiggle back and forth of about 1mm in length and that was it, the driver was fried :D
You can look up the needed wiring here:
https://github.com/Creality3DPrinting/Ender-3/tree/master/Ender-3%20Wiring/PDF
Regarding the pictures I promised, they will follow in the next days. I obviously didnt have the time in the past days :)