To prevent filament tangling - Nest. When the roll is new, the filament often gets tangled and the print stops.
Pneumatic Connector PC4-M6 from: https://eu.store.bambulab.com/en-bg/products/pc4-m6-pneumatic-connector-for-ptfe-tube?_pos=1&_sid=d2c4e90e1&_ss=r
The author remixed this model.
The model is made from "0". I used the idea of "ggaetoo", but with a lot of changes - Pneumatic Connector for PTFE and a free arm.