firmware

[johnz]

Hello I have a Prusa Reprap Acrylic i3 it had a sanguinololu board but now I want to replace it with a GT2560 board ...what firmware should I flash the Gt2560 to work with the printer ??? please help....Thanks.

[Mark]

Use the one for the I3X single extruder printer, and note the dimensions here:
// Travel limits after homing
#define X_MAX_POS 210
#define X_MIN_POS 0
#define Y_MAX_POS 210
#define Y_MIN_POS 0
#define Z_MAX_POS 180
#define Z_MIN_POS 0

Also the steps/mm here:
#define DEFAULT_AXIS_STEPS_PER_UNIT {78.74,78.74,2560,95} // MXL, Z M8=1.25, MK8

I think that might be enough.

[johnz]

I did all that ,now my prints come out real small?? I did not change anything in Repetier as it was working great with the other board.

[johnz]

also it wont print in the center, it prints on the side of the bed???

[Mark]

now my prints come out real small??---have you changed the steps to those that in your original firmware?
And the bed center, you can try to calibrate it here:

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