I tried other cable guides, and they were all too short, making the cable too taut. I decided to design one 10 mm longer, and now the wire is free to move.

UPDATE : New improved version available at link : [https://makerworld.com/it/models/1950777-cable-guide-extruder-bambu-a1-v2#profileId-2096112](https://makerworld.com/it/models/1950777-cable-guide-extruder-bambu-a1-v2#profileId-2096112)