Solved Z axis height problems

Hi all,

I would like to start by saying that I think the Robo 3D is awesome. I have been getting amazing prints out of it and have had only a few minor problems that were easy to fix. Lately, however, the printer doesn't seem to make the prints as large as they should be. When printing the 20x20x10 calibration box it prints it 20.2 x 20.2 x 8.8. This wouldn't be a big problem, but it scales up as the prints get larger (I printed a 33 mm tall object and it came out 28 mm). Nothing seems wrong with the prints, no skipped layer, no excess filament, nothing. It prints the prints exactly like they should be in all dimensions its just squished in the z direction.

Please note that I am still fairly new to 3D printing so I may not know all of the technical terminology.

Thanks in advance

 

Thanks. The thread you pointed me too was exactly what was wrong. Working much better now (Height only off by .02 mm).