MK7 Hack to Enable Filament Changes Mid-Print

The MK7 is great. But one thing never made it into the design spec: the ability to switch filaments mid-print.

Switching filaments enables multi-colored prints without fusing filament first. It also ensures that if you run out of a given filament, you can load new stock mid-print. This is very helpful for long prints.

The MK7's Stainless Steel Thermal Barrier Tube is not seated close enough to the Knurled Pulley, which makes it nearly impossible for a new filament to chase another into the