X Y Offset for Home

Apologies for the VERY basic question.

I have an i3 that I upgraded to dual extrusion. It works perfect, except the nozzles can't reach the full size of the X axis now.

Meaning, at X MIN, Extruder # 2 can't reach the edge of the build platform (Extruder # 1 is at 0,0)
Likewise, at X MAX, Extruder #1 has the same problem.

The MAX issue isn't a problem, but I'd really like to fix the MIN one. I'd like to move the X endstop over, to make it so Extruder # 2 can reach all the way to the edge of the bed. The problem though, is if I do that, Extruder #1 thinks 0,0 is now off the print surface, if that makes sense.

I've been looking in the firmware (Marlin) on where to set this, but I'm obviously missing something very basic. Can someone point me to the line that tells the X axis home is actually offset?

Again, sorry for the basic question, thanks for whatever help you can provide.

[github.com]

Ie

#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS 200
#define Y_MAX_POS 200
#define Z_MAX_POS 200

If your X endstop is moved to say -10mm then simply change your #define X_MIN_POS -10

You probably want your x endstop to be at - (the distance between your extruders)

Edited 1 time(s). Last edit at 02/16/2016 07:43PM by Dust.

That did it. Thanks.

Sorry for the late reply.