I kept having “Failed to feed the filament into the toolhead" error messages. I discovered my filament was not getting past the buffer assembly mounted on the rear of the X1C.

On my printer, the PTFE tube enters the buffer at a slight angle and causing the filament to get hung up on the quick disconnect. My fix was a simple magnetic guide to keep the PTFE aligned when entering the buffer. May not solve all issues but seems to be working well for now…

Need a 12mm x 3mm magnet and some glue.

I included a 2 x magnet version of the guide in case your magnet isn't strong enough or you want a little more rigid of a setup. Comment or send me a message if you want a different magnet size and I might be able to accommodate. STEP file included if you want to make changes yourself.