RudydG
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Everything posted by RudydG
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Hope you mean this from the picture? Why the question? With this (z 3.61mm) the gcode calibration.v03 works fine. It is exactly the same problem i had. Exactly!! Get your 2nd head higher, closer to the first, and all these problems will be gone. Just try, hang your 2nd head out of the printer, reduce your z offset to 1 mm, and simulate your trafiek cone startup. You will see the printer acting normal.
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Thanks. I have read this 10 times but I have not come clear with that. But now it works and after 16 calibration (calibration.v03) it "works" After that I add "Mark2 for Ultimaker2" in cura. Know i want to print my first "easy dual project" and it fails... 1. Download this: https://www.thingiverse.com/thing:21773 2. Load both files for extruder 1 and 2 3. Make settings for extruder 1 and 2 4. Merge both models 5. Save the file to de SD card 6. Try to print --> fail - The extruder 2 touched the buildplate at the first extrusion. - When extruder 1 starts to print, the builtplate ist to high and extruder 1 scratched the buildplate. - After i try to print the calibration.v03 again and everything works fine. What did I forget to set? (Its the first time i used cura 2.5). Or maybe i miss something with the start code? How much is your z-offset?
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Just to let you know, in my case, it was about 5mms, and i had to change the position of the second head, i printed a plstic shim to reduce the gap to 2mms With the 5mms my z axe went crazy during the head change or pick-up.
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I guess you are right, (the values i don't know, because we don't have control over the 3rd decimal figure) But i checked some old prints is still had, and i had it on all of my prints, from the beginning i used the MK2, but is thought it was bad calibration. Will follow this thread from distance, as i leave for a week on holiday ;-)
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Seems to be the same situation, let's hope this is true, so the solution could be simple, choose a round value, like 18.10 instead of 18.11 or 18.09 Maybe some others can test this also? I am printing dual at this moment, without problems / leaning / skewing ;-)
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I have 2 gcode files, which had the leaning problem before i changed my offsets to a round value, after that, the 2 files, without changing anything else, printed straight. Maybe i am lucky, but to me it seems there is an "connection" between the offset and the leaning.
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Can you post your extruder ofeset settings?
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Tested today: Redid the calibration, and put new values in the offset, still round figures. printing right now my own file which was skewed. All is printing fine now, straight!! So, at least for now, the printer works like it is supposed to. Can someone do the same things? Or people which have skewed prints, what are you extruder offset settings?
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Update, I changed the extruder offset values to 18.90 and -23.60 Print is perfectly straight now. If someone else could do the same test,we could narrow down the possibilities. About the extruder offset, if you calibrate trough the normal procedure, 1 step is 0.4mm. If my theory is correct, it could be solved by setting the offset to a round value before doing a calibration. (and the influence would be invisible) Will try a new calibration tonight, being sure that i have a round figure as result. and then a redo of this print.
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And another update: Cura 2.5 -Sliced for 2 extruders -print with the 2 heads -started print -object skewed to the rear (straight in the L-R direction)-exactly the same as with only 1 head. I can assure now, it is not a mechanical thing. I had it with S3D, Cura 2.5 Will try now, with other offset settings, see if things change. WIll ignore the calibration right now and set the values to a round setting. (i have a feeling it has something to do with this)
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Cura 2.5 -Sliced for 2 extruders -removed head 2 -started print -obeject skewed to the rear (straight in the L-R direction) Redo now with same Gcode, and second head in the machine + filament Wait and see in the morning. Already sure it is not a mechanical thing, otherwise it would not be skewed to the rear with the second head outside of the printer.
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printing right now!
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Maybe something to compare? My2nd extruder Offsets: X 18.93 Y -23.61 Z 2.06
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My thoughts; -my pulleys+belts are rock steady, no doubt about that. -if it was a mechanical problem (hitting the 2nd head agaist the holder, then it would dissapear once it has shifted a couple of thents. And it is so regular, that i really doubt it would not be software. My 2nd head is at the the right side, like in the building explanation.
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I had it now with several different prints, and different slicers (Cura 2.5 an S3D) In my case, it is skewed to the right, and to the back. Would it be some kind of rounding factor in the firmware, related to the calibration? And a kind of zero with the toolchange? I believe i have it from the beginning, but until now, i had not noticed it, printing abstract things where it was not noticable, and i knew there was something wrong, just could not detect it. Thought is was a wrong calibration.
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Same piece printed with Cura,no skewing, perfectly straight. Must be in the combination of S3D and the M2 firmware?
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Sorry, I was talking about the skew to the left. Ok, then i have good hope it gets solved ;-)
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You talk about the skew or the psu?
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I have a strange problem. With dual extrusion, PVA + PLA, my prints gets skewed in the X direction. both heads. Checked all the belts + pulleys. In single extrusion everything is 100% ok. Anyone?
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Thanks Marco, Will try this!!!
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I am working on a S3D profile too, I'm focusing on tool change script with idle temperature and a soft acceleration/jerk control. The latest script is good but not yet perfect. My current version works good. There was some ooze issues after the printer reads T0/T1 beacuse it unretract immediately the new extruder. With regard to the expected time and the real one, the maximum incongruity was +8 minutes. If anyone will try it, let me know if there will be some problems. https://www.dropbox.com/s/g3bs5chtbjl1qlk/Mark2_1.1.5.fff?dl=0 Marco, First, i did not have time to test the 1.1.5 version. Regarding S3D and speeds / accelerations for the second head. Did you get this to work? I see additional command in the lower script portion in S3D? This is about the only problem i still have, getting the setiings good for my second head with different material (Ultimaker Pva) Have a newer version to test? Many thanks, Rudy
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The Ultimaker pva is sticky, even after some hours in the water. But it also sticks well to the parts during printing. I also used other makerfille pva, easier tot remove, but it was more difficult to print due to less adhesion to pla.
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I use pc-max with UM pva, and use the Simplify 3D pla + pva fine profile. Only change the dense layer to 2, 90 % dense infill and 0 upper and lower seperation layers, also 0 horizontal offset. Works nicely. My printbed is treated with 3Dlac, and to get good adhesive on top of the pc-max, i make the support as big as i can, or have to. If i use the PolySupport, i threat it like normal support, no dense layer and a little horizontal offset.
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What i meant here, was are the pairs all in the same direction? That they are all pairs is ofcourse a basic, but if they where not, you couldn't even pick the head up ;-)
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Well, maybe the stiffer bowden, (i use the original brand new bowden), combined with the direction of the bend which the filament has can cause your situation. I am pretty sure, that, unless your magnets are to weak, it must be a to stiff bowden "combination"
