Voron 0.2 R1 formbot - Y axis homing

[shkop]

I'm on the initial setup. My current driver_SGTHRS for X is 40 and Y 55.
The homing looks ok. It meets the rear-right corner without banging into it. 
However, When I set Y to 0 it bangs the front door.
I thought maybe I missed the Y rail calculation in page 22 (38mm) so the rails are located too close to the front but it's really hard to verify. I measure 3mm to the orange stopper and anyway there are few mm to the rear extruder so it can't be much of a miss. (In simple words, I can push the Y rails backward by few mm but I'm not sure it's the right approach).
I'm puzzled. I tried changing the Y driver_SGTHRS value to no avail. 
I'll highly appreciate any lead. 

 

Edited October 28, 2023 by shkop