PTFE clip guide

I had problems feeding filament into the filament hub because the PTFE tubes would twist. To solve this, I added a groove to the clip based on https://makerworld.com/en/models/461476-ams-lite-ptfe-connector#profileId-1086788 and designed a keyed shaft to act as the axis. This prevents the individual clips from rotating and keeps the PTFE tubes from twisting. It completely solved my long-standing filament feeding issue. The individual clips need to be fixed to the shaft with glue.