Here is something I believe is a bug. I have 2 extruders and 1 hotend. Everything works fine if I start the print using Tool 0. However, If I start a print trying to use Tool 1, Simplify resets andthinks that we started with Tool 0 always. What I've done is to enter a T1 from the prompt switching to Tool 1. My profile is set to print from Tool 1. I have a filament switching script setup to run. One of the first things it does is M117 old tool = [old_tool] new tool = [new_tool]. When starting a print this always says old tool = 0 new tool = 1. For some reason, old tool is not 1 which it should be as I told simplify to use T1 as the tool.
What should happen in the tool change script, is that Tool 1 should retract 115mm, and then reinsert 115mm from tool 1. Instead, Tool 0 retracts 115mm and then T1 attempts to reinsert 115mm even though it is already fully inserted. This of course causes a issue with the amount of filament on the bed.