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UMO speed not changed by Ulticontroller.

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Trying to figure out why changes I make to speed through the Ulticontroller do not affect print speed.  Is my start code overriding any change from the Ulticontroller?

Here is my startcode:

G21 ;metric values

G90 ;absolute positioning

M82 ;set extruder to absolute mode

M92 E315 ;set E steps per

M107 ;start with the fan off

G28 X0 Y0 ;move X/Y to min endstops

G28 Z0 ;move Z to min endstops

G1 Z15.0 F9000 ;move the platform down 15mm

G92 E0 ;zero the extruded length

G1 F200 E2 ;extrude 2 mm of feed stock

G92 E0 ;zero the extruded length again

G1 X5 Y5 Z-15 F9000 ;drag nozzle

G1 F9000

M117 Printing...

Thanks in advance..

Edited by Guest

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I should mention that I also have speeds set individually in Cura 2.3.1

print speed 50mm/s

infill speed 60mm/s

outer wall speed 40mm/sec

inner wall speed 50mm/sec

top/bottom 40mm/sec

Are these taking precedence over input to the Ulticontroller?

Ideally, I'd like to keep these relative speed settings, and be able to increase or decrease them in proportion with the Ulticontroller while printing.

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Yes, that is where I am attempting to change the speed. In the past, this would adjust all speeds in proportion the the UC feed percentage displayed on the main screen. Currently for me, it is not altering the speed. I am wondering if the individual speeds I set in Cura are over riding any change I make at the UC, or if the something in my start code is preventing the controller from affecting the speed.

I will slice something with old Cura and with the same start code to try and narrow down the problem

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This has nothing to do with the slicer.

Marlin factors the speed/flow by the feed rate percentage so it overrides everything.

But be aware that changing the feed rate has no immediate effect, it first needs to flush the already processed commands in the print buffer. I particular when it prints slowly long straights (e.g. bottom layer) it can take some time before you can see the actual change.

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Right, I am aware of the lag to clear the buffer before the speed change. What I am seeing is a behavior abnormal to the past 4 years. I can say that I haven't installed firmware for over a year.

I haven't had an opportunity to slice something in the old Cura to make a comparison because I am in the middle of customer work. Testing will have to wait a bit.

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