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.
Hi T1GGE. No, a spring is not important for this extruder. Just tighten the screw enough to give the drive gear a good grip into the filament, but don't overtighten it. I've used my extruder a long time without a spring and it went fine...