Hi Ted,
I carved a mm ruler with my Handibot into 6x8" acrylic sheet. It looks great. I carved one in the vertical direction with lines every mm, and one in the horizontal direction.
For the Y, it is bang on the whole 8" or 210mm.
But for the X, it is off (compared to several metal rules I have) by about 0.5mm by the time it gets to 140mm from the origin. ~0.4% error. Not acceptable if you are making rulers that you would like to be useful.
I think this may explain some artefacts I always get when I do tiling.
Is there a way I can adjust the "steps per inch" (or per mm or cm) in Fabmo?
Or otherwise calibrate X travel?
I assume the VU command you mentioned is in the G-code. Or is there some other way to invoke it and save that result so that the
Handibot always moves in X the number of mm I command it to move?
Thanks,
Steve