SailMad

Unfortunately I upgraded to Cura 4.7 and it wiped out all of my settings. The good news is that flow IS NOW WORKING in 4.7. Is this related to another setting? I don't know. I'll keep my eyes open as I am likely to set the same parameter a second time.

3% could realistically be the raft or brim. Of course if ONLY the raft had less flow that would be the opposite of what that initial layer flow setting would mean. I'm stumped.

I clicked 'show all' related to flow. It is interesting to note that the initial layer stays at 100 when I set flow to 80. Also note that in the above example I picked layer 93, to avoid any issues with the initial layers. This is a simple cube. Edit : Looking at the preview - I'm guessing the line I chose for an example above is infill. My previous testing however was with a wall line, with similar results.

Here is an example I ran printing with 100% and 80%. I saved the gcode files back when I was having poor print results. This is a very simple 3d cube printed 'solid' (not in vase mode.) First 100% flow. ;FLAVOR:Marlin ;TIME:2575 ;Filament used: 1.9831m ;Layer height: 0.2 ;MINX:67.4 ;MINY:67.4 ;MINZ:0.2 ;MAXX:132.6 ;MAXY:132.6 ;MAXZ:25 ;Generated with Cura_SteamEngine 4.6.1 Jumping to the end of layer 0 .... ;LAYER:93 ;TYPE:FILL ;MESH:cube.stl G1 F1800 X111.959 Y111.959 E1482.76082 G0 F7200 X110.771 Y111.959 G1 F1800 X111.959 Y107.524 E1482.94719 Now with 80% flow ;FLAVOR:Marlin ;TIME:2575 ;Filament used: 1.93164m ;Layer height: 0.2 ;MINX:67.4 ;MINY:67.4 ;MINZ:0.2 ;MAXX:132.6 ;MAXY:132.6 ;MAXZ:25 ;Generated with Cura_SteamEngine 4.6.1 ... ;LAYER:93 ;TYPE:FILL ;MESH:cube.stl G1 F1800 X111.959 Y111.959 E1431.2997 G0 F7200 X110.771 Y111.959 G1 F1800 X111.959 Y107.524 E1431.48606 Now for some math.... Total filament used 1.93164 * 100 / 1.9831 = 97% (not 80!) Flow 100% Delta E on Layer 93 : 0.18637 Flow 80% Delta E on Layer 93 : 0.18636 0.18636 * 100 / 0.18637 = 99.99% One of the odd things is that these numbers CHANGE. Just to not correct flow rates. Any ideas what could be going on here? I have a fairly vanilla install with a non ultimaker printer. I think the only 'interesting' setting I have is Retraction Extra Prime Amount is set to 0.064. I have my filament diameter set to 1.75 and nozzle diameter 0.6.

I created an account to post this, but in Cura 4.6.1 (the only one I have tested) the flow parameter has no effect on the E value. I have verified this both experimentally, trying to modify a fixed thickness calibration cube --- and by examination of the E values generated in the g-code of some simple test shapes. Based on the above discussion, I can only concur that this is a bug. After printing a dozen calibration cubes at differing flow rates on a .6 nozzle (as little as 50% flow) and seeing zero impact this was maddening. This was verified by some very expensive measuring equipment. An M221 value inserted into the startup g-code fixes this and creates the appropriate reduction in flow rate. M221 S85 ; Set flowrate to percent After doing this my ability to print PETG went from almost impossible to results similar to what I am able to get with other filaments. One of the most maddening things about dealing with open source project maintainers is trying to convince them an obvious bug in fact exists. If you can point me to the unit test that handles checking the flow calculations I'll see if I can fix this one myself, or at least track down why it isn't working. Cheers!