I have just purchased a secondhand dual extruder that was used on a 2.0 350. I am trying to install on my 2.0 250 and can’t get past the auto-leveling that seems to assume the bed is larger than it is. Please help 
Did you follow the mounting instructions?
The Toolhead is mounted out of the middle.
https://wiki.snapmaker.com/en/Snapmaker_2/troubleshooting/dual_extruder_nozzle_below_print_sheet
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I’d also try updating or re-flashing the FW for your 250 while that module is attached.
Hey @xchrisd thank you so much, this did the trick. I didn’t have instructions or the frame of mind at the time to find them. Everything is working really well, I cant speak more highly of the SnapMaker in all its forms …not to mention the responsive community. Thanks everyone!
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