i think this has been covered already but worth a remention as my A350 shipped with the extruder E value of 212.21 and it needs to be 249.65
This is quite a 15% inaccuracy and results in significant under extrustion. Quite suprising the Snapmaker team didnt catch this in QA testing. Hopefully they will ship future units with an updated E value to save novices a lot of hassle.
Infact id just say change it to my value by connecting via the Serial USB (not WiFi as you wont get the data) Maximise the Console window in the Luban Workspace. Type M500 and note that the M92 line is likely to have E212.21 at the end… Type M92 E249.65 and press enter . Then type M92 and press enter to notice the value has changed to be E249.65 then press M503 to update the firmware and permanently store the new value