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calibrating x, y

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Steppers don't need calibration. They always do 200 steps per rotation. The rest is all fixed mechanical. Resulting in the right number of steps per mm of movement.

But... are you printing with PLA or ABS? ABS shrinks, so that would explain the 2mm difference. PLA also shrinks a bit, but only a tiny bit compared to ABS.

Other causes for smaller objects could be wrong slicing configuration settings.

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Well, now that your printer is working, it's recommended to upgrade to Marlin to start with, gives much better prints.

The Beta3 from SkeinPyPy:


assists you in upgrading to Marlin, and also contains an easier configurable Skeinforge.

Not sure what could be wrong with your Skeinforge settings, but I made this display frame, sliced with SkeinPyPy. And it was spot on size wise. The hole for the display was exactly as the measured size of the display itself. It wouldn't have fit if it had become 2mm smaller.

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You might be using an old firmware from prior to October 2011.

The correct 1/16 steps per mm is 78.7402

if you get the current Marlin installed, the value is set correctly:

#define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200*8/3,865.888}

alternatively, you can add the following line in the beginning of your gcode:

M92 X78.7402 Y78.7402

That should make 100mm 100mm... at least on my UM... if that is not solving the issue, you might want to look into loose belt issues, if there is too much or any slack, the precision goes down.

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