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Yeah--to clarify for future searchers: To do any of the Calibration Shapes tests that require changing parameters via g-code while printing (eg. temp control, retract settings, flow rate, etc) with Cura 5.1.1 and an old-school Ulitimaker 2 : Change the Machine Settings -> G-code flavor to "Marlin". This allows for G-code to override UM2's controls. When doing a Retract Tower test, you might need two instances of the RetractTower Post Processing Script, one for speed, one for distance.

It looks like I needed to use 2 instances of the RetractTower script, one for Speed, one for Distance. Not sure if this is normal, couldn't find any info on that one way or another. Tuning begins! 🙂

Still battling....changing to Marlin seems to have messed with extrusion/flow rates, looking into that now. Also, the RetractTower script distance and speed settings are acting weird. When I change the distance starting value to 1.0mm, the speed also changes to 1.0mm. If I change the speed back to 10.0, the distance also changes to 10.0.

Thanks for the clarification on UM2 handling the material settings, and the Marlin g-code tip; I've give that a try to dial in the best settings and then punch those into UM2 material specs. 🙂

Having a heck of a time trying to set up a Retract Tower. The retract speed and distance are not changing according to the post processing scripts (eg. increments of 10mm) when printing, the settings remain at defaults. I've read the notes on this tower, including enabling retraction, and turning off the adaptive layer setting (noted here: https://github.com/5axes/Calibration-Shapes/wiki/Retract-Tower). Additionally, I can't seem to adjust distance/speed settings despite having these settings marked as "visible." Can't figure out what I'm doing wrong.....Ultimaker 2, latest firmware. Cura 5.1.1