Large calibration square

I tell people in IRC how I calibrate my X and Y steps/mm, and they immediately ask for a .stl - so here it is.
A 100 x 100 x 1 mm hollow square, for calibrating your X and Y Axis steps/mm, and for squaring your Y axis.
I tell people in IRC how I calibrate my X and Y steps/mm, and they immediately ask for a .stl - so here it is.
A 100 x 100 x 1 mm hollow square, for calibrating your X and Y Axis steps/mm, and for squaring your Y axis.