3.6.7 Update: Model Export:
1. The model made in the assembly room can be exported to Obj format, so that you can open it with other 3D modeling software.
The exported model is saved in the "User/exps/" folder. The User folder can be opened in "setting" menu.

2. Fix bugs:
(1) Errors will be reported when loading model accessories that do not exist. (2) Hydrogen cannot be used in steel furnaces. (3) Hydrogen cannot be recovered.