MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Cheers! It's best printed in ABS, but a couple of people have had it working well in PLA. You shouldn't be able to over-draw it, once it's under the hook it should latch and be ready, hopefully! If it doesn't feel smooth then you might need to adjust the XY offsets, is it an open source machine?