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.
Filament entanglement is a very common cause of air prints (3D printer extruder can't pull the filament when it gets stuck in a knot). The most common underlying reason is that the filament tip at some stage becomes loose and get twined. In the long run this causes a knot to form.
We designed the arm on the filament spool holder to give an adequate entrance point for the filament for most sizes of spools. So far no knots have occurred.