Pen Plotter not drawing images to scale

Hi

I just recently finished a build of the drawbot from Thingiverse. The board is a cnc shield and arduino uno. The example files that came with the build will print to size. Any image I send to it will only print to about 1 quarter the size. The files are created in inkscape and sent to the plotter via USG software. ANy help or advice would be greatly appreciated.

Thanks

Is an arduino involved?

You probably need to calibrate your system by setting the correct values for the numbers of steps per mm of movement.

…R

rnormore: The files are created in inkscape and sent to the plotter via USG software.

Are you referring to Universal G-Code Sender?

And as Robin2 pointed out. You'll probably need to do a calibration. Plenty of vids on YouTube and instructions on the web on how to do that. It's fairly simple.