Hello! I can’t understand this. At some point the printer shift along the y axis ruining an otherwise good print. Any suggestion?
I have the same problem, but only for the first 2-3 layers.
what kind of printer are you using? I someday had a similar problem caused by a worn out hotend mount for the e3dv5 with a bowden extruder. another reason could be a shifting z-axis.
I’m using a prusa i3, I’ve just replaced the whole z axis so I don’t think it’s the problem. Could be something related to the y axis bearing not sliding properly?
slow down the print. add a heatsink to the y stepper and add a little more juice to the stepper driver. soon as i slowed down my prints i dont have this issue anymore.
the default 60mms print speed is hell on the Y axis for the prusa models.
Print speed was 40 and travel 100, I’ll try to put a fan pointing on the electronic
Yes. Slower takes care. Also see if your hotend bumps on the print while doing travel moves. That’s the number one cause for shifted prints in my case. Usually when my bed is not reallyc level
yep, over extruding will cause the hot end to drag and can cause stress on the axis of direction. thus a shift. poor z offset can look like over extrusion as well.
I know its painfully slow but try 30-35 that’s what mine works best at. the prints look better too. or try to lighten the y axis and go with a boden setup. makes the whole machine lighter, that’s my next upgrade.
OK I’ll try to follow your suggestion thanks guy! Another thing… Im printing with pla at 180 degree but sometimes the first layers of the print are almost transparent so I suspect the temp isn’t right at the beginning. How do I make sure the filament have the right consistency before the print start ?
Speed is usually not what makes a printer’s axis skip, it’s acceleration. Try lowering it to about 500(mm/s²) for the y-axis using M201Y500 and see if that helps.
But since he says its only in a few layers, i guess its something that comes and goes. So i doubt it could be acceleration or velocity. Since you are saying that the bottom layers are transparent, it most likely is because, your hotend is pressing onto the bed. Try raising your Z endstop by small amounts, and check that when you home Z, you should be able to move a sheet of paper between hotend and bed
If it’s only in a few layers, it’s exactly the kind of problem caused by accelerating too fast and getting the printer’s y axis to resonate on small infill areas.
That was insighful. Thanks @Thomas_Sanladerer I havent faced that issue yet. It might come in handy in my future builds.
Your skipping steps. Try tuning the pots on your stepper drivers, and possibly adding heatsinks and a fan.
I’ve an auto leveling system with a servo and microswitch and I’ve checked that when z home there is enough space for a sheet of paper. I’ll try later to reduce acceleration and I let you know. Thanks for the great support
Does this happens with only one stl file or all of them,
This happend to me once, becasue of error in the stl file slicer generated wrong gcode.
May be a random limit switch trigger. Last resort is to disable limit switch checks during printing if reduced accelerations do not help and your mechanicals are good. False triggers can be caused by electrical noise or a sloppy limit switch, or loose mount.
This happened with two different stl file but then I reprinted one of them and I had no problem
I was having the same issue with my i3 randomly doing that and changing jerk values/acceleration/speed made no difference. In the end I reduced from 1/16 stepping to 1/8 to increase the torque and no problems since. Resolution is down but cannot tell the difference.