Well.. From the beginning (bigbox titan hybrid model) this happened randomly. I have yet to ever figure out why it's happening. When it prints right, it's glorious, when it does this, it's a totally ruined print. Here we go. Dear maker I hope someone can help. Ever since I have gotten this printer, every once in awhile it would glitch and the z axis would not advance during printing. It has gotten worse over time (maybe.. really hard to tell because it's 100% random). To the point I know that about 75% of the prints will have this problem. (see image below) Example: I can print a file, and after 15 minutes or so (depending on print size or number of separate objects in the job), I can usually see that it has already started to mess up, but not always. Stop it. Restart and then it prints perfect, no changes at all. Here’s what I don’t get. I can start a print, it messes up. Stop the print, auto home, restart the print, and it prints fine (or not – totally random if it will print ok or not).. Other times, it prints fine from the first try. I’m literally at my wits end trying to figure this out. Here are things / theories I have tried. All failed. 1. Bed leveling. I don’t see how that could be possible since 1 full print is fine and the next is a total waste. And if a 9 inch tall print can go fine, then I don’t see how it could be bed leveling whatsoever. 2. Memory. Being an IT guy, I thought, well maybe memory is screwed up. So power down, leave it off for a few minutes, power up and try the print again (after a bad print). Seemed to work a couple times then totally proved that wrong, so it was coincidence. 3. SD card.. Seems like it has problems reading the SD card from time to time. I thought maybe it was seated improperly. Checked it out up down and sideways, even tried printing with it slightly backed from being seated all the way in, and again, seemed to work a couple times, then was proved wrong again. 4. SD card writing from computer & ejection. Thought maybe it had to do with ejecting the SD card before removing it from the computer after saving the file. Nope. 5. 3D print layout. Early on, I thought maybe how the print was laid out on the print bed or maybe how it saved or something was it. Again, proved wrong very early on as the exact same print file screws up and then might print fine.. Totally random. 6. Power.. Here is the one I have not tried. A 3D printer friend of mine (not with a bigbox) says he had issues with power regulation and ended up putting an UPS unit between his power source and the printer, which filters and regulates the power and it has done him a world of good. Interesting concept and I have considered purchasing an UPS unit, but I would much rather get support to interject first. 7. Software / firmware updates? Honestly I don’t even know if this is even happening for the bigbox units. Suffice it to say, no updates, if they even exist, have ever been done. Ya, I'm sure a couple people will squirm about this. 8. Overheating???? No idea. If it sat powered down for 2 days or just finished another print, still has the randomness of a good print or a bad print.. sigh. So.. any help would be welcome. I just have nothing left. I have ruined print after print and I cannot keep going like this. There has got to be something simple causing this. When it doesn’t screw up, it prints like a dream and I love my bigbox unit. Please help. I have dug through support and can’t find anything about this exact issue. In the example below and I failed to mention. Once it screws up, it screws up throughout the entire print. If it doesn’t fail after a bit the entire print will go just fine. Again, random and makes no sense whatsoever.