Arjan QiDi

I have two printers running on a Chitu F board. Both print nicely with Cura when I use them as a single extruder. On one of them I can swap the single extruder head with a dual extruder head, but the dual extruder seems to be incompatible with Cura 3.4, 3.6 and 4.0, because temperature and fan control is mixed up between the extruders. I have analysed the gcode that Cura generates, compared it with the (Cura 2.7 based) Chitu slicer (which I don't like) and I think I have found the cullprit. I only don't know how to solve it, so I hope someone here can help me with that. The problem: In Chitu all the M104 and M109 codes are made explicit, but in Cura they are not. When the T0 or T1 is missing, the printer will apply the setting to both extruders, instead of only the one mentioned a few lines above. A similar thing happens with the M106 code for the cooling fans. I only have one fan for both extruders, but to steer it properly it should be combined with P0 explicitely. Unfortunately, Cura does not do this when you assign fan 0 to both extruders. Chutu g-code snip: G0 F1920 X117.348 Y62.631 G1 F720 X117.348 Y71.802 E38.066 M104 T0 S200 ;MESH: G0 F1920 X50 Y25 G1 F600 E26.066 G92 E0 T1 G92 E0 M109 T1 S200 G0 F1920 X50 Y25 Z0.3 G1 F1800 E-1.5 G0 F1920 X50 Y35 G0 X98.718 Y65.072 M104 T1 S175 ;TYPE:SKIRT G1 F1800 E0 G1 F1200 X99.031 Y64.572 E0.02943 Cure g-code snip: G1 X198.335 Y193.549 E90.72415 G1 F1200 E74.72415 G92 E0 T0 G92 E0 M109 S175 M104 T1 S200 ;MESH:Ball35mm.stl G0 F2880 X198.335 Y193.949 Z0.27 G1 F1200 E13 G0 F2880 X198.335 Y203.949 G0 X191.354 Y214.263 ;TYPE:SKIRT G1 F2400 E16.02079 G1 F1800 X190.518 Y213.74 E16.06507 G1 X190.061 Y213.403 E16.09056 I look forward to your suggestions! Regards, Arjan

Installed 3.4.1... same issue

With respect to thin walled prints, the results have never been pretty on my QIDI X-one 2. Depending on the exact shape and settings I will get someting that looks like a poor start or underextrusion on the in- or outside of every layer At first I thought it had to do with my retract settings and tried all kinds of distances and speeds to get it better without even the smallest succes So I accepted it for a long time and considered it one of the very few drawbacks of this small but sturdy printer. But recently, I decided to look into it again and now I found someting which suggests that NOT my printer, but Cura is the cause... When I make a 1,2mm thin walled cilidrical object and tell cura I want a 0,8mm wall thickness with a 0,4mm nozzle, I get 2 red lines (outer walls) and 1 green line (inner wall) in the simulator, so at first sight this looks exactly the way I want. When I run the simulator, it makes the inner wall first, immediately followed by a first outer wall. After that, I would expect it to immediately do the other outer wall, but instead it makes the nozzle make an extra full circle first without extruding anything and only then start with the last outer wall. And exactly this is causing my problem. As this is consider a extrusion of 0% flow by cura, there is no retract nor any real extrusion going on during that extra circle, so obviously, there will be some oozing which cause a poor start of the next extrusion. So my question is: how can I fix this? How can I make Cura slice it properly? I don't want to use a single wall thinkness, since that would compromise the thicker parts in my print. I know it is in 3.2.1 and all its predecessors but have not checked if something has changed in newer versions. Does anybody know?