TPU loads and prints fine - gets bunched up on unloading
I've had great luck printing with this TPU filament on my MK4.
https://www.amazon.com/gp/product/B00TI3JUTM/
Unloading however, once in a while, it will not push the filament up and will partially kink above the gear drive and I can sometimes pull it up to get the slack out to unload but today I had to remove the gear to get it out. Curious if I need to pull up when unloading TPU to help ensure it will unload? To my untrained eye it feels to me like there needs to be a wall in there or the like to help it not find an alternate path when unloading. 🙂
I love this MK4! Had put five years on an MK3s and man, this MK4 really built on the design of the MK3 in every way. 🙂
MK3s / My IKEA Lack enclosure
RE: TPU loads and prints fine - gets bunched up on unloading
Try loosening off the 2 idler screws about half to 1 turn before you load the filament.
Remember to retighten them when using the other filament types.