I am trying to print some parts for my local high school First Robotics Competition, and they do all of their "drafting" in inches. I do all of my printing in metric. I tried interactively with my printer setting units to inches, and then also interactively entering some movement commands, and it still seemed to move in millimeters. I assumed, for example that a "G1 X1 Y1" would move to the (1 inch/1 inch) point instead of (1 mm, 1mm). Maybe my assumption is wrong, but I decided it would be easier to just convert the drawing to metric.
I tried scaling by 25.4, but the resulting drawing was massive, far exceeding the bounds of the heatbed (the part is only about 5 inches long). Upon further comparison of the STL file I exported and the original ipt file, I came to the conclusion that Autodesk must internally represent drawings as metric, and further, the base unit seems to be 0.1 mm - at least that seems to be what was exported in the STL file.
The bottom line is that I scaled the STL file by 10 and the print was perfect.
This just seemed odd to me.
