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conny_g

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Everything posted by conny_g

  1. Weird to say "glad to hear that". But the last few days printing a larger mechanical object (CO2 laser tube holder ?) the GreenTec was driving me crazy searching for the right print parameters. Good to see I am not alone ? I had checked the nozzle if it was clogged, the feeder if it grips and whatever else. And finally it's just soft for the feeder and of lower viscosity for the nozzle, pretty challenging combination. I researched this in the web and did not read a lot of these issues about it. Actually very little reviews / tests / experience with GreenTec. Makes the impression it's still low in reach in the community.
  2. I have quite some issues with GreenTec. I seem to have strong underextrusion with it. I print it with 115% flow, below that I have gaps in the print between perimeters and infill and sometimes even between perimeters.
  3. Hi all, I upgraded my 2nd UM2+ to Mark2 recently and had some issues initially. Took me some time to fix the hardware issues (Ultimaker mainboard blown, expansion board broken, nozzle jammed), calibration issues and now to find the right settings to get good dual print results. As it was a mix of things it was at times a bit difficult to understand what was happening. My first "cats" were really ugly and I took a few weeks (not full time, of course) to identify the issues and improve the print. I think I printed some 10-15 cats ? Here's the latest and best now, the best dual print cat I ever printed ? After some hardware issues the rest to tune and improve was print temperature, speed, acceleration, calibration. Temperature: with the 3DSolex Matchless nozzles I needed to go down to 180 C at 30mm/s print speed to get rid of overextrusion in small details and blobs. I think I never dared to print that low. Speed: at 30mm/s and lower (this cat was printed at about 25) seems to be the sweet spot. Acceleration: Interestingly this setting to control acceleration in Cura is really negative for prints with fine details. As the speed/acceleration goes down in the corners of small details, but the extrusion does not go down that fast it creates really bad edges and blobs. Best for this cat was to turn that Cura setting off and set the printer to 2.500/15 for acceleration/jerk. I was never looking here for an issue as this setting really improves prints with large straight areas and sharp corners. But obviously this is killing objects with small details. Calibration: I did the "dual meter" prints one complete evening calibrating the last fractions of millimeters, but still the cat print was off by 0.1-0.2mm. Still don't understand that, but with a few more cat prints, changing the extruder offset 0.05mm each time it got better and better. Also the Z-offset makes a big difference. Print first two layers in two colors and measure them with a caliper. Adjust Z-offest. Repeat until it's <=0.02mm accurate. Overall: it's worth to spend a few hours to a day on calibration, the prints will be much much better if you have fine details like this cat. See zoom photo attached on the "acceleration control" issue below. Hope this helps. I was quite mad and desperate in the middle of this process, really didn't understand why it was better with my first Mark2. But it's simply many parameters to get right and if you don't document them in detail.... Cheers, Conny Pic of this best ever dual color cat print: Zoom image of the best cat, with accelaration control off. Zoom image of one of the earlier tries with acceleration control on: (see the edges of the colors, terrible!)
  4. Upgraded tonight and did a few dual calibration prints. And it seems it runs fine. Looks like the printer runs even more smoothly with Cura 3.3.1.
  5. Hi all, can you tell if the newest Cura versions run fine with Mark2? Afair I have read that there were issues with the 3.x versions so I was not upgrading yet to save time & trouble. Have there been issues at all? Are they fixed? I saw there is additional config files for Cura in the github package for Cura 3, is that all it needs? Cheers, Conny
  6. Recently I was wondering why of my freshly built Mark 2 printer the hotend fan and the model fan of the 2nd hotend won't work. Today I have taken the time to analyse it. Started by putting the printer to its side, opening the Mark 2 expansion board box and measuring the outputs of the board. Finding that there was no voltage on the fans. I noticed that the expansion board was rather hot on one side. My thermal imaging camera (flair one) said it was actually 80 degrees C hot. I saw it was the 1k resistor near the 6 pole header coming from the control panel board. Weird! So I unplugged the expansion board and took it to the desk to check what's wrong. Resistors were ok. One of the transistors had a short, the other at least no proper diode voltages. So it seemed the transistors were dead. But why? Umm. Shouldn't the diodes be the other way around if they are freewheeling diodes. Checked the schematic. Checked the diodes. Yes, they were mounted the wrong way!! I bought the board completed, so the manufacturer mounted the diodes the wrong way and that seems to have killed the transistors.... So I reverted the diodes, mounted new BC817 transistors, reassembled the printer ... and ... it works, the fans are alive! @DidierKlein, who is assembling your boards? :-)
  7. Ordered this one as a spare now: https://www.aliexpress.com/item/High-Quality-3D-Printer-Accessories-2016-Latest-Ultimaker-V2-1-4-Control-Board-Ultimaker-2-Generations/32662872341.html Let‘s see if the quality is ok... :-)
  8. And did you have one with the stepper modules or with soldered drivers? Would you recommend to get one with modules? Would provide for using an alternative driver, getting rid of the zebra stripes.
  9. And how did the china board "end", by being replaced with Duet3D or did it fail? And the other one? :-)
  10. I have 2 UM2+ and three original boards, fried one two years ago. Unfortunately the repair of that failed. Changed the Atmega16u2 on that which works again now, but now the board has other issues (m2560 can be flashed directly, but not through USB and the board won’t start, display stays dark). Currently no time / enthusiasm to look further what the problem is. So I am actually considering of buying a chinese one as spare. It seems the frying of boards happens every 1-2 years :-) Which board or seller could you recommend? Any issues with the chinese I should be aware of or is it plug & play?
  11. I don't understand? Are you talking about the Ultimaker Board 2.1.5? These are soldered on the board.
  12. Finally a first "two-color cat" with the freshly built Mark 2. The back is not very clean, forgot to switch on the "Mark 2 Tweaks". Disassembled the feeder, did not find anything unusual. Found that I used an old version of the firmware, whyever I did that late in the night :-) Hope that's the reason for the E2 model fan not working. So I updated, reset the firmware, configured the parameters. Now calibrating and then another cat.
  13. The hotend fan works. Also checked the transistor via diode test and it was ok. I have only two things open from this Mark 2 build and board repair: - the E2 feeder (Bondtech) seems to have issues. E2 tends to underextrude and it makes decent strange clicking/crackling noises while extruding. But it does not grind. Interestingly I have swapped extruders for the dual mod (former E1 became E2) and that printer already had issues with the feeder before. So I should disassemble the feeder and see if there is something broken. - E2 model fan not working. Next steps: factory reset to make sure it’s not software. Double check firmware. Unplug and power the fan directly. Check expansion board connections. Check output signal of expansion board.
  14. It was in fact a big mess on the nozzle. It vibrated out by 5mm and spilled the filament through the thread. Took some 10mins to clean up .... Now started the next test print, want a successful two-color cat and then I'll take care of the E2 model fan issue.
  15. Good point, need to check that when back at the printer. Just had a quick look & photo in the morning. It’s a 3D Solex Matchless block and nozzle. Looks like the nozzle is unscrewed and flooded with filament....
  16. Printing looks good so far, let's see tomorrow if the quality is ok. Somehow the head 2 model fans are not running (using the expansion board), need to diagnose tomorrow - it's 4.30am already...
  17. Reassembled the printer. Repair looks good. The LEDs work again, even brighter than before it seems. The fan can be set via the menu and works. Now a test print!
  18. And both transistors failed the transistor test in above linked post. Both had 0 Ohms Collector-Emitter. Did the repair, now curious if it's going to work. Not really a "beautiful" repair, but technically ok. :-)
  19. So the front panel display/ wheel are unused after the mod? Do you need a different display then or just none?
  20. I have already changed the Atmega16u2 on another board and the buck converter on this one. I think they are harder to change, so the bc817 should be easy. The black/blue box is a relay, afair it’s connected to the emergency switches that are shorted/jumpered/unused in the UM2. Good point actually that they are for 10A, hope they have a bit of tolerance as with my 360W power converter I need 15A ....
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