Hi,
Finally, after 2 weeks building it (this is my first 3D printer), I can print ! I had to solve few problems but now it kind of works. But I still have a strange trouble and no clue on how to solve it.
When starting a print, the printer auto level then starts the first layer. On the center position, the Z height is correct but on the front side on the Y axis (towards the screen), nozzle is too high so hardly sticks to the bed while on the rear side of the Y axis, nozzle is too low so I nearly have no filament on the bed.
This trouble is only on the Y axis. The X axis keeps the same Z nozzle height.
As the printer auto level, I don't understand why this happens. I see no way to solve this problem. As there are 2 step motors for the Z, I tried to manually lower the front one to compensate before power on but it changes nothing. It's like the auto level is making a mistake.
I have the dual extruder Proforge 2S and the upgraded heated bed and flex plate.
This would be nice to find help on this one.
Best regards, Yodine
Finally got it right. After checking everything, I came to change the spring coupling part. As I have the dual extruder, it makes a lot of weight on them so on one side it was totally compressed when the head was on that side.
My guess is that when moving the Z axis, the compression of the coupler would change the Z height.
As seen on YouTube, I put a 1/4" roller ball between the stepper motor and the lead screw so that they are in contact and the spring coupler can still do its job compensating, but not Z axis.
Now the first layer is correct on all surface ;-)
Hope this can help others in may situation