Modifications Snapmaker u1

A few modifications to the Snapmaker U1... Ventilated lid https://makerworld.com/fr/models/2205... https://makerworld.com/fr/models/2344... Rear feeder with a Creality Space Pi4 for filament storage https://makerworld.com/fr/models/2484... PTFE blocker for Creality Space Pi 4 https://makerworld.com/fr/models/1674...