Wrong Size after extension of Ortur LM2 Pro

[berainlb (PY)]

This applies to you. Note that instead of the 850 in the post you’ll need to use 800.

LM3 extension rails installed, machine won't go beyond 400 x 400 outline?

I believe the LM3 extension increases length of the Y axis. Can you confirm? If so, make sure it’s the height field in Device Settings that you’ve made 850mm. The way you’ve listed it implies that the change was made on X axis. Additionally, you’ll likely need to make a machine setting change. In Edit->Machine Settings change $131 to 850.