I'm setting up a dual extrusion printer, one head is printing well while the other one have not enough feedrate, putting much thinner lines of plastic (about half the size of the expected amount). I am using the latest version of marlin, Ramps 1.4 and pololulu stepper drivers; the slicer is slic3r 1.2.9. I tried to figure out the source of the issue by doing this: - switching extruders + hotend wires : the insuffisent feedrate moves to the other extruder while the previously broken one starts to work well. - checking drivers microstepping : both of them are set to 1/16th - replacing pololulu driver on the faulty extruder... problem still occurs I saw in some forum topics that marlin is considering E step/mm to be identical for all extruders; so I am running out of ideas.... really don't know where it could come from... If you have an idea about where this behavior could come from, your help would be very much appreciated. https://reprap.org/forum/read.php?262,547581,547581#msg-547581 Mon, 10 Aug 2026 10:18:15 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?262,547581,547935#msg-547935 https://reprap.org/forum/read.php?262,547581,547935#msg-547935
Thanks a lot fixerT :) Problem is solved.]]> dewasa Printing Thu, 20 Aug 2015 12:59:23 -0400 https://reprap.org/forum/read.php?262,547581,547870#msg-547870 https://reprap.org/forum/read.php?262,547581,547870#msg-547870
But you can select filament settings for each extruder separately in Slic3r and you can choose them to be the same (see attached screenshot).
Have you done this?]]> fixerT Printing Thu, 20 Aug 2015 10:36:26 -0400 https://reprap.org/forum/read.php?262,547581,547763#msg-547763 https://reprap.org/forum/read.php?262,547581,547763#msg-547763
I had little time to do further testing (I started a print with Cura sliced object and it seemed all right), but my assomption is that there is something wrong with the slicer. Do anyone knows about a feedrate bug in the latest version of slic3r (1.2.9) ? It's like slic3r is assuming that I am using 3mm filament on E1 while I have 1.75mm on both hotends.

I will update my answer after I finish my tests..

Thanks]]> dewasa Printing Thu, 20 Aug 2015 05:40:53 -0400 https://reprap.org/forum/read.php?262,547581,547688#msg-547688 https://reprap.org/forum/read.php?262,547581,547688#msg-547688 Are you sure the nozzle is free and of the same size?
-Olaf]]> o_lampe Printing Thu, 20 Aug 2015 02:19:12 -0400 https://reprap.org/forum/read.php?262,547581,547581#msg-547581 https://reprap.org/forum/read.php?262,547581,547581#msg-547581
I tried to figure out the source of the issue by doing this:
- switching extruders + hotend wires : the insuffisent feedrate moves to the other extruder while the previously broken one starts to work well.
- checking drivers microstepping : both of them are set to 1/16th
- replacing pololulu driver on the faulty extruder... problem still occurs

I saw in some forum topics that marlin is considering E step/mm to be identical for all extruders; so I am running out of ideas.... really don't know where it could come from...

If you have an idea about where this behavior could come from, your help would be very much appreciated.]]> dewasa Printing Wed, 19 Aug 2015 17:03:51 -0400