So the main problem is that arduino (or slic3r...or pronterface) thinks that the board is WAY bigger than it is. Every time I print, it homes itself and then proceeds to run to its max x-position and attempts to continue beyond that (obviously it can't, but the motor keeps running, so I have to abort the print).

I've changed the settings in slic3r for board size, I've changed the code in Marlin for max x,y, and z travel, and I've adjusted the default board size in pronterface, but nothing has fixed the problem.....Is there something I'm missing?? Thanks in advance!

Is your printer properly configured? Meaning telling it to move 10 mm it moves 10mm?

Slic3r needs to know the size of the bed, and where the center of it is. You can't just set the center to 0,0. Also, your steps/mm need to be set correctly in the firmware, or it won't move the correct distance for a commanded move.

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Mike Anton
[manton.ca]
[laserlight.wikidot.com]

@manton

I'm running Marlin on my Arduino. Would you happen to know where in the code I can adjust the steps/mm??

You will find it in Configuration.h, under DEFAULT_AXIS_STEPS_PER_UNIT.

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Mike Anton
[manton.ca]
[laserlight.wikidot.com]