Replicator Extruder for FLEXIBLE materials - Mk8

I put this thing up when I first developed NinjaFlex. I have since left NinjaTek to start Diabase Engineering with a colleague. The Flexion Extruder is our debut product. It can print flexible materials much faster than this design (and much softer materials too).
You can find it here. [Flexion Extruder](https://www.flexionextruder.com "Flexible filament extruder")

Over the last couple of weeks, I've had a few people contact me about jamming difficulties with flexible filaments. By far, the most critical feature for printing flexible materials is having the filament completely supported between exiting the drive gear (nip) and entering the cold end. This design is just a slight modification of the work done by whpthomas, emmett, whosawhatsis and others. I've just added a small amount of material to prevent the filament from folding under the hobbed portion of the drive gear. It doesn't seem like this would make that much of a difference, but it does...it has allowed me to p