DWC volumetric flow that 2 x that of prusa slicer

moth4017

git_0.15mm_PLA__41m.gcode

dc42

@moth4017 also check in the object model browser that move.extruders[0].filamentDiameter is correct. RRF passes the extrusion rate in mm/sec to DWC, and DWC uses the filament diameter to convert it to mm^3/sec.

moth4017

@dc42

moth4017

@moth4017
i do have 2 extruders running at the same time in a push pull configuration is it possible its adding both values?

chrishamm

@moth4017 Set the mixing ratios to 50%:50% and double your E steps/mm (and potentially other E-related settings), else your filament-based estimation is probably off, too.

deckingman

@moth4017 said in DWC volumetric flow that 2 x that of prusa slicer:

@moth4017
i do have 2 extruders running at the same time in a push pull configuration is it possible its adding both values?

Yes. The firmware has no way of knowing if the mechanical configuration is a single input hot end with two extruders in push-pull configuration, or if it's a two in one out mixing hot end with both extruders feeding different filaments. So it will combine the flow for each extruder in accordance with the mixing ratio in use (in your case that would be 1.00:1.00 so 200%).

moth4017

@deckingman if the esteps are different on each extruder is it still 50:50 or does it have to be in the estep ratio?

deckingman

@moth4017 said in DWC volumetric flow that 2 x that of prusa slicer:

@deckingman if the esteps are different on each extruder is it still 50:50 or does it have to be in the estep ratio?

Not sure I fully understand your question but for the purposes of calculating volumetric flow correctly, the sum of mixing ratio should add up to unity. As @chrishamm has said, you could double the steps per mm for both extruders then use 0.5:0.5 instead of 1.0:1.0. If you have different steps per mm for each extruder and the system works but the only problem is the displayed volumetric flow values is exactly double what it should be, and if your current mixing ratio is 1.00:1.00, then double both extruder steps per mm from their current values and halve the mixing ratio to 0.5:0.5.

moth4017

@deckingman
interesting at 50% its is half the speed of prursa slicer so:

at
M567 P0 E0.5:0.5 half the speed of the prusa rate DWC 4mm^3 Prusa 8mm^3
M567 P0 E1:1 is twice the speed of the prusa rate DWC 16mm^3 Prusa 8mm^3

in DWC if i extrude 40mm on 20mm is extruded
M567 P0 E0.5:0.5 it is also only extruding half the amount of filament

i guess because it is selected in "Mix" but it also Prints in "Mix" because it assumes the extruders are in parallel.

@dc42 may be there needs to be an added option to M567 2P ( for 2 extruders in parallel) or 2S (for 2 extruders in series
) etc .

deckingman

@moth4017 Did you change the extruder steps per mm as well as the mixing ratio?

moth4017

@deckingman no only the ratios , i left the steps/mm correct for the extruder

deckingman

@moth4017 That's your problem. DWC will report the extrusion amount based on the sum of each extruder in accordance with the mixing ratio. So when you used 1.0:1.0 you were seeing the volumetric extrusion reported as being double but the actual amount extruded was correct. By changing it to 0.5:0.5 in a push pull arrangement, each extruder will physically half the amount needed. That's why both @chrishamm and I told you to double the steps per mm for each extruder so that the amount physically extruded would remain the same.

moth4017

@deckingman

would it make more sense for the software to adjust the steps/mm so that you can set up the extruders with the correct steps, because when your using multiple tools keeping track of them is fun .

thanks for all the help