In the legacy Cura profiles for Mini, three temperatures were used:
(1) Soften material for retracting,
(2) Soften further for wiping nozzle,
(3) Printing temperature
In Cura 2.6, the Mini profiles are missing the “Soften” temperature – and go directly to the “wipe” temperature before retracting. The “soften” step isn’t in the start Gcode, and in fact “material_soften_temperature” feature has been DISABLED in the Mini machine definitions, which prevents it from showing up at all in the UI. The TAZ6 profiles still enable material_soften_temperature, AND use it in the start Gcode.
Retracting before going up to the wipe temperature helps prevent oozing during preheat for certain materials. There are significant differences in the “soften” and “wipe” temperatures, as seen in the table created for this task: https://code.alephobjects.com/T719
Can someone from Lulzbot comment on why this feature was disabled for the Mini? I’m hoping it was just left out so that Cura2.6 could launch on time, and the intent is to enable it and use it in the start Gcode for future releases.