Clearly under extruded. But when I checked the E-steps (twice!) they were correct. So after researching I figured the Z calibration was off. So I recalibrated and same thing. Then I manually calibrated and it was waaaay too low.
I created a 2x2 square and kept printing the first layer and kept getting a bad print. Finally, I saw that one could adjust the z height while printing and it would stay. So printed the square several times, adjusting the z height until the print was good.
So now everything is working, well if not perfectly. I’ll continue adjusting as I go. But (at least in my case) the auto z height calibration was pretty far off. So my suggestion would be to manually set it, but a little too low (although the same height as my single extruder that worked perfectly) and then print and adjust as you go until you find a good height.
I also kept a record of all my work so the I should be able to recreate it if I lose my settings.
That’s what many users report - in my case, I end up ~0.3 mm too high. There’s even a bug filed, but yet to no avail. In my case it may (at least) partly be caused by the X-module flexing when the DX presses down for auto-z-calibration.
Of course, I spoke too soon about solving this issue. On the right extruder I still can’t get it right. If the layer is smooth there are still gaps between the skin and the walls. I have to seriously lower the head to the point where it leaves a trough in the filament in order to fit the gaps. So back to the drawing board with the right extruder!
Are you aware that you can adjust Z-offset on the fly for left and right separately? For me, that is good enough, I use the skirt to tune the Z-distance in, and basically get along very well this way…
So I adjusted the Z on the fly (which is how I got the left extruder correct), but on the right extruder the skin is correct - beautiful and smooth, no gaps between the lines, except there are still small gaps where the skin attaches to the walls. I will post a picture once I get home. I thought I had one but apparently I don’t.
I am in the process of redoing the calibration now. Releveled the bed, then redid the z auto and then manually adjusted it while printing. Then X/Y. I’m doing the X/Y check, then to bed - it’s late here. Tomorrow I’ll check e steps for the third time, and then try a print again. The thing is, it’s not the dual nozzles per se, since it’s an issue with one nozzle - gaps within the one extruder, not between the duals. So ???
IMHO -0.05 is still too low, judging by your picture. If going to +/- 0.0 brings you back to your original picture, I’d try increasing flow rate in 5% steps in the slicer. After finding the sweet spot, you now how far off the E-Steps are.
I seem to remember that when the DX came out, E-Steps could not be set individually for left and right extruder. Does anybody know if this is still the case? if so, that would be a problem if the filament you use is significantly thinner than the other nozzle’s filament. Still, slicer flow rate adjustment should solve that.
It was actually +.05, wrote it wrong. That was from my manual calibration that I purposefully set low. I went back and reran all the calibrations, this time using automatic and then adjusting manually to get the best layer. I ended up with L -.25 and R -.35.
I’m currently printing flow calibration cubes via teaching tech to see about the flow. once I have that I will go back to manually messing with the Z height. This is what it currently looks like w the left extruder -
Still underextrustion, maybe a little. If the flow is good I’ll drop down the Z height and see if I can get rid of the gaps and make it smoother.
@Hauke the E-steps can be set individually - there is a post about it I bumped to the top and asked the mods to pin or add to the calibration a must thread.
My e-steps were right on again (for the third check). Good on Snapmaker for making that change. I remember my SX was way off.
Finally, when checking the e-steps of my RX, I discovered the Luban won’t let me heat up the RX manually. Whatever I do only heats up the LX. I had to use G-code to get the RX up to the correct temp to do the test.
So after a week off I’m back at it. Installed the new firmware (1.18.2), releveled everything, and manually leveled the Z while printing. Ended up with -.40mm and it is fine. The first layer looks like it’s printing too low, but all the gaps are filled. When I printed the flow calibration cube it came out to .4mm exactly, so it isn’t a flow issue. Anyway, things are rolling and the printing is happening, so I’m happy. Thanks to all who read and/or commented.
