I am brand new to the forums. I purchased my first Lulzbot, a Taz 5, this past ~March. When I first got it, it was working fantastic for a few weeks until the nozzle clogged. I replaced the copper nozzle with a nickel plated .05 nozzle and broke down + cleaned the entire extruder head assembly. After I reassembled and re-calibrated it was printing better than ever - the highest quality prints I’ve had since purchasing the machine - I was very happy with the performance. That all abruptly ended about a month ago. I was attempting to print a Mother’s day gift when (see attached pics of pink print fails) the extruder head suddenly started rubbing against the print. I left my house and when I came back after the print had been going for about 2 hours, I could literally hear a very awful sounding rubbing/scraping noise coming from the print. I rushed over and killed the print and shut the printer down… The results are pretty ugly… This was the event that began my printer woes.
After many experiment runs after, it looks like after the prints reach a certain height the extruder head starts to get ever so closer to the print until it eventually starts to physically knock against the print as its trying to extrude filament – this is evident by the squished looking layers from the side profile shots I took. Also notice the very top layer - the top is very wavy looking due to the extruder head dragging across.
I have since recalibrated multiple times, adjusting z-stopper and re-leveling the bed, but to no avail. Mind you I have not adjusted anything about the extruder settings – to be honest I don’t want to screw anything up in there because I don’t know what I am doing yet.
The parts never grow tall enough to ever physically rub against the extruder head now… They just start peeling up at ~10mm layer height. Even my calibration cubes lose adhesion on the bed and eventually fail. I’ve attached pictures of that as well. I’m convinced my axes are out of whack at this point…
I was suspicious my heat bed may have been going out so I ran a couple of experiments. I used my digital laser infrared thermometer and shot the heat bed in a 3x3 grid fashion. First capture of data was the original orientation I left the bed in after the problem started to occur. The second capture of data was after I snugged the heat bed all the way down close to the aluminum y travel plate - I figured this might help keep the heat bed a little hotter with less space for air to pass through and cool off the heat bed from below. Not once did my bed actually reach the desired temperatures: 60, 65, 75, 100. The recordings are extremely variable with no consistency whatsoever. As I attempt to reach 100 degrees Celsius the standard deviation increases.
Is this a good indicator that my bed is going bad and needs to be replaced?? - or - Are my suspicions that the axes are all out of whack more accurate?
I just purchased a dual extruder head because things were going so well — I just want to be printing again… Somebody help!!!