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.

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With ToyREP I don't retract at all. It have no sense as the speed of extruder is around 4mm/s. If you really have to try very short reverse movement of around 1-1.5mm and no z-hop.