The T-1 is presumably supposed to be what causes the system to return any existing tool before picking up the new one??

However you are spot on correct, the toolchange system works perfectly if that line is removed / commented out!

It was in the E3D toolchanger template files I found, and it worked fine with those files, just changed tool positions, when I first set up the Duet on V3.3, so I have no idea at all why it messes things up now? That was the really confusing thing.

Oh well, I can start recalibrating everything now and hopefully get it printing.

Thanks!

@o_lampe if you have a tool selected, then T-1 will run the tfree file for that tool. If no tool is selected, there is no tool to free so no tool change macros get run.

Well there are the tool change macros which may do what you wish... or are you looking to have completely different configurations depending on the tool? In which case maybe M505 is closer to what you want?

https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M505_Set_configuration_file_folder