Finally after a few printbed modifications my printer is working perfect… For the first 20 / 30 layers. After the first 20/30 layers the printer gets confused and starts printing +/- 1 cm to the left. So it keeps printing the right profile but “in the air” Did anyone had this problem before?
I noticed that repelletier host 0,90 is available, i will update my software but i don’t think that will solve the problem.
Anyone an idea what goes wrong?
With kind regards
Martin
Same problem here, about 2 mm to the left, is it the fannozzle that you printed?
I have the same problem as well,
But my shifts varies from 1 mm to 10 mm.
I’ve increased the reference voltage for the stepper motor in question, X-axis in my case, and it does help.
But I’m up at 550mV now and it is still happenning, but not in all prints.
I’ve also made sure the X-belt is straight as a line, but no luck.
I’m using Repetier Host 0.90…
this sounds that your stepper looses steps.
check that your platform (X & Y) is very easy moveable. if you push it with your finger, it should not stop instant. best would be it moves to the other end 
i had some issues with the Y axis, as soon the black plastic holders where tighten too strong the platform was very hard to move at all.
you have to flush 4 linear bearings at the same time! tighten the screws over cross, so the pressure is everywhere the same.
so i did not tighten them very much, works better if you have more helping hands, and all can fix the holders at the same time.
Hello Forum members,
Raising the voltage to 0,50 V and loosening the bearings seem to have solved the problem. The printer is working perfect at this moment. It printed more than 50 layers and still no error has occurred.
I have the same problem which makes the prints unusable.
It happens sporadically and stepper voltage is adjusted very careful.
It is really disappointing when this issue happens after 2-3 hours printing and everything is for the trash.
Any other ideas how to solve this issue??
These problems occur when stepper motors are slipping.
Could be because your stepper driver is not correctly calibrated.
When the calibration voltage is to low then suddenly with fast transitions the forces are to great for the motor to be precise and it slips a few steps. Solution is to raise the calibration voltage a bit (in steps of 0.1V) so when the manual tells you to set all the voltages to 0.45V then try 0.55V, if the problems are not solved try 0.65V.
Also check if there are no mechanical problems. If it is verry hard to move the carriage the motors will slip more.
When the calibration voltage is to high it is possible that the stepper driver will go in temperature protection and when it is cooled down it will start working again. This will also result in skipped steps. Solution is to lower the calibration voltage of the stepper driver in question a bit.
I was calibrating the drivers to 0,55V and was good hope.
Unfortunately after 1-2h of printing the same issue again. 
I am getting crazy. Not possible so far to get useful print of bigger size object.
But the good thing is that i have seen something in the logfile which could point to the root cause.
Anyhow … when the problem happens i can see endstop hit on the y-achsis.
The position of the print bed is far away from the endstop (Y:102.32).
I have checked micro switch, connections and cable. Everything seems to be ok.
It was not visible in the printing activity that the motors stopped. The printing seemed to work fluently.
Because of this (and the logfile confirms this) it seems that the endstop was triggered only very few milliseconds.
Could this be FW or HW related issue???
E.g. Microcontroller interpretes (wrongly!) LOW instead of HIGH for only one sequence???
I do not know for sure but could this the reason for the behaviour???
If this is the case i would recommend to modify the FW … while printing the endstops should not be evaluated at all. Only for initial calibration.
Can somebody with the same problems confirm the presence of the endstop in the logfile???
Hello forum members,
So i raised the voltage of the stepper motor to 0,55 V. this solved the problem of the slipping stepper motor. printing went fine after this adjustment.
But then i decided to update to repeletier host 0.90. The fist 7 layers of an 4 cylinder engine file printed perfectly, then the y- and x-axis started shifting a tiny bit per layer. so everything i try to print now is deformed. unfortunately i didn’t make a picture of this. Does anyone have a idea what the reason of this weird behavior of my printer is ?
Greetings,
Martin
P.S. i will upload a photo monday when i get home.
mr cg,
Can you check if your endstop switches have a bad contact in the switch (so when they vibrate they trigger)?
Martin,
The newg config file is a bit faster and has more speedchanges in the gcode. Try raising the stepper voltage to 0.6 - 0.65 on the X and y axis. Also check for wrong endstop triggers.
Hello VEL327
I will raise the voltage to 0,6 / 0,65 volt for the x- an y- axis. i will also check the end switches for bad contact. Monday i will give an update.
I had a similar problem and I am pretty sure it was caused by the X belt being too loose. I was suffering from staircasing when moving in one direction which seems to have been down to the belt vibrating and I think the belt vibration was enough that occasionally it would skip a tooth in the belt.
Before tightening the belt I had tried increasing the drive voltages and adding lubrication.
Since tightening up the belt, I have no more staircase effects and it hasn’t had the layer dislocation effect any more, well so far anyway…
Hello meavydev,
I’ve got an staircase effect indeed. And my x belt is not as much tensioned as my y-belt. I will definitely give your solution a try.
Thanks for the reaction !!
martin
I can recommend printing a belt tensioner http://www.thingiverse.com/thing:130235 It helps a lot if you have only two hands available.
I had the same problem, but only after I replaced the USB-Cable with a longer one (maybe it was not for USB 2.0). After a lot of layers there was a permanently shift about 1 cm. The restarted print shifted after the 3rd layer. When I replaced the USB-Cable with the former shorter one no shifts anymore. I also forced the ASCII-protocol in the printer settings.
I just fixed this problem. It turns out for me that my X belt was too tight after I tried to adjust it from being too loose. I was not aware that too tight would be a problem, so be mindful. I am able to squeeze the x-belt together now and not feel much tension, but that’s about it.
i have the same problem shifting layer on x-axiy 2mm layer 35, then i rotated the print 90° and had the same problem on y-axis 4mm layer 45.
Changed position and so one - nothing helped.
travel speed was @ 150mm.
the shifting occures randomly just on some prints. try now with 100mm travel speed.
hope the print will end fine.
now after more than 2 hours i had theproblem again.
thingiverse.com/thing:181093 my phone stand.
here the pix:
3rs3.ch/3Dstuff/20131110_142759.jpg
3rs3.ch/3Dstuff/20131110_142808.jpg
I have had this problem
If you are getting a message about the Y stop in the logs
Make sure the wires going to the switch are not rubbing the back bar
When the wires go across the cable tie it will give out a false report
Also check the screw that holds the pulley on to the motor.
Remember these move very quickly and can get loose
I hope this helps
didn’t get a message and marked the pully on motor - would see if they are lose. tnx anyway
it’s not a hardware/software problem!
i did see what happend - sometime, on larger printing objects, the edges come up printing thin areas and cool down till the extruder moves over this position.
then the movement is “blocked” and this causes the “my” shifting.
if only x shift occurs then set the 4 acceleration settings in slic3r to 600 mm/s2. You find them under ‘print settings’ -> ‘speed’ -> ‘acceleration control’. Additionally you can set Vibration Limit in slic3r ‘Printer Settings’ -> ‘advanced’ to 10 Hz)
