@highpower this is a known issue, and there is a rather simple workaround:
- Manually load the filament into the 3D Printer Module and leave the door open.
- Place a long piece of scotch tape as the base of the door and angle it up vertically, slightly to the right, so that you can stick the other end slightly to the right of the filament entry point.
- Using the end of the tape that is free, apply light pressure to the filament by tensioning the tape and sticking it to the top of the 3D Printer Module.
You might need to adjust this a few times until you figure out what pressure works best, but that should work. Once I figured this out I have never had any issue with flexible filaments. It would have been nice if Snapmaker had added a pressure adjustment screw like every other extruder has, but we are stuck with what we have.