I'm still in the early stages of commissioning my build and haven't done an actual real print yet, but I have the machine fully built and what I feel like is most of the config complete. One thing I've noticed is that during a print (dry run with no filament or heat), when a tool change happens, after the tool is dropped off and the head moves out, the bed will raise to what looks like about Z0 or just above, then move over and grab the next tool, then move back down. I'm struggling to figure out what's causing it to do that. Maybe i'm blind, i'm not sure! Duet 3 RRF 3.1.1 I'm using Steve Cregan's PrusaSlicer config bundle from here: https://github.com/StevenCregan/Slicer-Profiles When I change tools manually via the gui with no print running, it doesn't seem to do that. Below are my tool change macros for T0 (the other tools are the same) and some relevant gcode from PrusaSlicer. Also, here is a video of what i'm referring to (right around the 3 sec mark): tpre0.g Code: ; tpre0.g ; called before tool 0 is selected M98 P"/macros/Coupler - Unlock" ; unlock Coupler M564 S0 ; allow movement outside the normal limits G1 X-160.5 Y100 F50000 ; move to location G1 Y115 F50000 ; move in G1 Y143.2 F2500 ; collect M98 P"/macros/Coupler - Lock" ; close Coupler ;WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! ;if you are using non-standard length hotends ensure the bed is lowered enough BEFORE undocking the tool! G91 G1 Z10 F1000 G90 G1 Y50 F4000 ; move out M208 Y66 ; set Y max for this tool M564 S1 ; apply the normal limits again tfree0.g Code: ; tfree0.g ; called when tool 0 is freed G91 G1 Z4 F1000 ; drop the bed G90 M564 S0 ; allow movement outside the normal limits ;M98 P"purge.g" ; purge nozzle G53 G1 X-160.5 Y50 F50000 ; move to location G53 G1 Y115 F50000 ; move in G53 G1 Y143.2 F5000 M98 P"/macros/Coupler - Unlock" ; open coupler M106 P2 S0 ; fan off G53 G1 Y75 F50000 ; move Out M564 S1 ; apply the normal limits again A snippet of gcode generated by PrusaSlicer during a tool change Code: G1 X-24.969 Y22.282 E0.02195 G1 Z0.950 F7800.000 ; Filament-specific end gcode ; Run custom tool change G-code ; Run tool change as expected ;M98 P"purge_left.g" ; Purge extruder T-1 ; Drop off tool M106 S1 ; Set part cooling fan based on filament profile T1 ; Pick up next tool M116 P0 ; wait for extruder to reach temp ;M98 P"prime_left.g" ; Prime extruder ; Filament-specific start gcode G1 E-4.80000 F3000.00000 G1 X28.687 Y22.832 F7800.000 G1 Z0.350 G1 E4.70000 F1200.00000 G1 F1800.000 G1 X29.055 Y22.874 E0.03366
I think it's because the slicer is generating T-1 to unload the old tool explicitly before doing T1 to load the new tool. This is unusual, it should just generate T1. The T-1 command causes RRF to remove the Z offset of the old tool, ready to do some moves with no tool loaded.