[solved] CURA 2.3.1 trouble with Flow and Print Speed in Per Model Settings - UMO+

peetersm · January 5, 2017

I'm trying to adjust the flow and print speed using the per model settings and getting unexpected results. Any advice about misunderstandings or errors I'm making would be greatly appreciated. UMO+ CURA 2.3.1

Changes made in CURA

Normal part = flow 100% , speed 50mm/s

Bridge part = flow 500% , speed 5mm/s

(see video)

What I was expecting was that the bridge part would print very slow and extrude a lot so you would get lacy loops accumulating all over the wall below. But I did not see that. During the bridge part the speed does not look anywhere close to 5mm/s and the output(flow) also does not seem to increase.

FLOW?

Based on the CURA documentation it seems like FLOW should only effect extrusion rates but I am not able to verify that--OR -- FLOW also changes other parameters that I am not aware of.

SPEED?

I realize the "normal part" is probably not printing at 50mm/s due to min layer time settings (default 5sec) so I would not expect a 10X speed change, but I have seen 5mm/s speeds and the "bridge part" is not moving that slow.

I have uploaded my model and gcode here in case this helps:

https://www.youmagine.com/designs/test-vase-for-cura-per-model-settings

Edited January 5, 2017 by Guest

peetersm · January 5, 2017

ok, I made a better test model which I could print faster and test up to 5 different settings in one print.

and I discovered:

#1. (duh) There are several speed parameters and "PRINT SPEED" does not change all print speed settings. For this thin wall model I needed to modify "WALL SPEED" in order to see a difference.

#2. At 50mm/s changing FLOW has little effect on the print since there is a limit to how fast you can extrude plastic. At 210C with PLA that is probably ~6mm^3/s .

Here's a nice photo of my tests (click for big view).