Bad Gcode from Matter Control/Matterslice?

[jckrieger]

I've been having trouble lately using the stock firmware on the V2 and Matterslice/Matter Control. I've had a few prints in a row now where the G-code basically crashed the print nozzle into the bed on the first layer or into the part after 2-8 layers.

I first had this happen when exporting the gcode to a file and then copying it to the SD card. The printer printed a portion of the first layer, but it was the wrong shape and then half way through the layer it started pushing the nozzle into the bed.

I'm now trying to print another larger .stl (it's a spiral flower pot) and have had 2 prints fail, one from the SD card, one direct through USB. The print is staying glued down and the first few layers are perfect, but both times the print head eventually crashed into the part and caused the print to fail.

My only thought is that a drive gear has slipped on a stepper motor (since I was watching the print during the last failure and the nozzle did not hang up on a warped section of the print). The gears are secured with red loctite, and I actually had to remove one when I first assembled the printer and it was not exactly easy to remove without a lot of heat from a heat gun.

Let me know if any of you have had bad gcode. Everything looked fine in the layer-by-layer view, so that's why I'm not 100% convinced it's a software issue. I'm going to try the cura slicer tonight and see if the print is successful.

If it makes any difference, I'm printing trimmer line at 145C in an enclosure that warms up to about 31C at the moment (my basement is cold). Belts are tight and smaller/shorter print duration parts print just fine. I've only had this problem when printing say, 9, 2 hour parts at the same time or now this single 48 hour part. The print always fails very close to the beginning.

[Mac The Knife]

What's the diameter of the print? Trying to print a 10" diameter turbine, I had weird problems, didn't matter what I sliced it with. Changed it to 9.25" and it printed fine.

[jckrieger]

It's about 10" diameter at the top, and 8.5" at the bottom. However, I did notice it decided to randomly print some support material towards the edge of the printable area on the last print

I can print a 10.25" diameter circle without any trouble, but it seems like I run into problems once I add Z height to a large diameter print job. It definitely seems like it's software related. If the skate was crashing into the bed I would have noticed it and it would be hitting on the first layer when the skirt is printed. It's really strange...

[dunginhawk]

any chance you adjusted the z height? i did that last night, and for whatever reason if i was at HOME, and went to z height and calibrated it, it would not start at 0, but at the previous value... I had to actually home it again before it would work.
just a thought.