Hi,
I was getting reasonably good quality prints from my 3d printer. Yesterday I printed a pretty large model with lots of support(0.2 mm layer cura slicer also tried slic3r). It was a 25 hour print and at the middle of the print I noticed some layer misalignment or shifting(not sure which is). But I didn’t tried to adjust anything since I didn’t want to mess it up even more. But the finished print has lots of misalignment or shifting problems especially in area of solid layers. I printed another part which only has few supports(0.1 mm layer), it turned out good, no problems, then I tried a belt buckle with support which also has lots of layer misalignment or shifts. So i think this issue only happens when there’s lots of supports. I re-tightened belts and slightly increased motor current for X and Y, after the first print.
Any idea what causing it?
Nozzle dragging on the full infill layers and support perhaps? How well are your e steps calibrated?
Overheated stepper driver/ stepper motor skipping steps?
@Peter_Hertel Actually nozzle is dragging on the support structures , any way to solve that?
E steps are calibrated fairly correctly based on the drive fear diameter, Could that be the issue for nozzle dragging?
@Tinkering_On_Steroid Nah, stepper motor looks good
Try reducing the extrusion multiplier to 90% or so.
@Dushyant_Ahuja with 97% I could see gap between perimeter and infill,
Now testing with 98%
In that case check the z-steps. you might be slightly off
@Dushyant_Ahuja
Not between layers, but between infill and internal perimeter.
I’m using M8 for Z axis
mm per revolution = 1.25
Micro stepping = 16
stepper motor 1.8 = 200 steps
so
Z_step = (200*16)/1.25 = 2560
Isn’t it the way to do it?
@Athul_S_Nair Try to reduce the extrusion multiplier for the support only. The nozzle should not drag on it, it will make these artifacts as you see.
@Athul_S_Nair that is the correct way.
@Dushyant_Ahuja So, problem could be with over extrusion??
@Peter_Hertel @Dushyant_Ahuja
https://drive.google.com/open?id=0B5_IWI68ZqZTTkpQd1BrVTVFekE
print done at extrusion width 0.98
You can clearly see gaps between perimeter walls but no gaps in solid layer ,is that okay??
That looks like a combination of backlash and model design / slicing. Try increasing the infill / perimeter overlap setting in the slicer. I think you can reduce the extrusion by a few more %
@Dushyant_Ahuja what does backlash has to do with it?
If your printer has backlash, it travels in one direction X distance, but on the way back it travels X - dX distance - hence there is a gap. This is specially prominent in infills. The best way to reduce this is to ensure your belts are tight - you should add a belt tensioner of you haven’t. The other way is to increase the overlap in the slicer - so that it compensates for these issues.
I think your extrusion multiplier is pretty close. It could be jerk settings, or issue with cura. Cura doesn’t always retract on moves which can lead to buildup.
First try lowering jerk, then acceleration.
@Stephanie_A I tried both cura and slicer with retraction enabled, both had the issue
I recently changed the drive gear of my extruder, seller said both should be of same diameter so \i didn’t change the e_steps. Let me check one more time and calculate the E_steps.
Also when I print cubes, the ends are actually not sharp, but curvy, could be due to incorrect jerk and acceleration settings
Current E step is 90.35
New calculated E step is 89.35
could that make a huge difference?
@Athul_S_Nair I’m going to contradict Stephanie here - not because I think she’s wrong, but because 3D printing is still an experimental technology and many times the answers are counter intuitive. In this case, if your corners are round, try increasing the jerk and acceleration settings. Lower jerk and acceleration cause higher deposition at the corners rounding them.
Most importantly - post back here what worked for you.
