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Ultimaker Community of 3D Printing Experts


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  1. I've come to the conclusion that in my case there's oil-soaked wood dust in the linear bearings, that needs to be cleaned out. I haven't had a chance to actually do it yet, and won't for a while, but it makes a lot of sense to me. The printer was sitting in a pretty dusty wood shop, and I can see the grime inside the bearings. When I oil the rods, everything is smooth for a while, but a few hours in the dust absorbs the oil, and everything binds up. I'm going to disassemble everything and soak in WD-40 or something along those lines to get it all clean, and keep it away from wood dust in the f
  2. So, after getting branded black Polulu stepper drivers, and replacing all of them, I have the same exact problem - skipped steps on the X-axis during long prints (6+ hours). Current is set to 1.15 amps, no heatsinks (per documentation, none are needed for this current level with active cooling). I noticed that all the skips are in the same direction - it keeps shifting towards the left, if looking at the printer from the front. Is this data point ringing a bell for anyone? I have nothing else left to try other than replacing the main board on a whim :(
  3. Ah, too bad. In my case it probably happened a while ago with a larger model running into the same issues as yours. I think I'll try getting good quality stepper drivers instead of the cheapos I have now, there's some timing support for this being the problem...
  4. Here's one weird thing I noticed, the head bearings are shifted on the X-axis, same axis that's skipping - http://imgur.com/sdX2dkZ . There's a matching gap on the other side. Could this be a symptom of a hardware issue? Everything feels very smooth, especially after oiling.
  5. Yeah, I've been doing it for close to two months now with no progress. I was hoping someone has experienced this with a unique root cause - I've already tried all the common ones.
  6. Hi, Any other ideas? I have a very expensive paperweight at this point :(
  7. That would show up on the Ulticontroller, right? Nothing like that is showing.
  8. That would be quite involved, I'd either have to re-wire everything or cut and re-splice the wiring... I'm not sure it's possible for a stepper motor itself to cause this - they're basically solid state. I certainly haven't been able to find any confirmation that it could be a potential cause.
  9. 1.15, as per the documentation. I tried lower and higher as well, it's skipping at all settings.
  10. I've swapped the drivers around, and have a bunch of new StepSticks I've tried as well, no difference - it keeps happening on the same axis.
  11. The fan is running fine, it's oiled and produces plenty of airflow. Additionally, whenever I catch it in the act of lots of skipping, if I shut down the print and take off the cover, the driver heatsinks are barely warm.
  12. Hi all, I have an Ultimaker Original that started skipping steps on long prints (10+ hours) a few months back. Since then, I've tried everything I could think without making much of a difference. Pretty much the only thing I haven't tried is swapping the steppers. When it skips, it's a bunch of steps at once, like the driver overheats and shuts down. My test case is a 20+ hour print, slow, at 40 microns, so that I don't waste too much filament. I always oil the axes first, movement is smooth all over, no obvious binding. It always skips on the X-axis. - Replacing the stepper drivers, swap
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