Does anyone know why while my printer was printing it just decided to print the model a few millimeters to the right? I have the printer bot simple metal kit.
Skipped some teeth on the belts maybe? Did it make a weird noise or anything?
Something has kept that axis from moving back to its correct position, sticking bearing, belt drive gear slipping just to name a few.
Do you think tightening the belt will help.
I would try and see if everything is sliding smoothly and put a felt pen mark on the motor shaft and the drive gear that way you will be able to see if the gear is spinning on the shaft. There is also current issues that may be causing this as well.
Stepper motor skip also seems possible, especially if the motors are undersized or print is too fast.
Stepper motor heated and skip with noise or shaft slipped/screw loosen.
I agree try tightening the belts
Cause of this for me so far has always been a bad or improperly adjusted stepper driver. They are small and fairly ill suited to the kind of abuse we throw at them and need to be replaced every so often.
These kind of things often happen if the nozzle gets stuck somewhere while moving around, and the motor current is not high enough to overcome the mechanical resistance - then the motor loses steps.
In this particular case, this seems to be the case: Note how the offset is more or less exactly the thickness of the ear. Probably the nozzle came from the left (all seen as in this picture) after printing a layer there, and moved to the right. The slicer had planned to start extruding on the right side of that ear, so the nozzle had to move across the ear.
However, the nozzle got stuck at the edge when hitting the ear (maybe a little bit of plastic was sticking out), so it didn’t move all the way (and since it was moving, it was typically faster than printing, which in turn means: less torque).
So it got stuck on the left side of the right ear in the picture, assuming it was on its right side and printed from there. This explains the visible offset. The motor doesn’t have any feedback, so doesn’t know that it is off … so this was its new normal from then on.
To fix: increase motor current and/or print slower. Also, there are slicer settings that tell it to go around already printed things when moving.
Good point on the slicer settings. This is also why high dollar commercial printers have servos instead of steppers these days, that way they can track & retry missed steps.
when you slice setting this modle, you must pay attention this questions about the Speed of printing,also,the Hollow section need to support.Btw,can we Introduce our printer.maybe you can leave message to me .
Check set screw on pulleys. Check and tighten belts. Don’t go above 100 on travel moves. Slower print speed if all else fails. Pots are always worth checking and tuning once. Slipping z coupler could set the tip up for a crash with the model- wouldn’t take much. Calibrate your extruder to be sure over extrusion isn’t quietly adding a fraction of over print height to your layers… It can add up over time and at adequate print height, finally force a crash.
That’s everything I can think of.
Oh, and filament pull can do it if the spool is on the table and not above, forcing a little tug to skip steps, but I’ve only seen this in the y axis… Unless the spool is off to the side and pulls itself into a collision with the y movement on the bed. If you are not in the room, it can recover and the spool be pushed back out of the way do it may not be obvious.
3d printing is still a black art at times.
Brook
The model seems fine to the poitnt where the head has to accelerate between the ears. I would check non printing move speed and then it may be related to a sticky bearing loose belt skipping steps.
Looking at the bottom layers of your print (not the ears) I’ve had something similar in the past with PLA, when too much plastic gets extruded on the first layer. The nozzle was hitting the bumps and not making a full return in that axis. As the gentleman above says, tighten belts, lubricate bearings and for the base layer, check your slic3r settings.
Recalculate?
make sure all movement is smooth and unconstrained. Looks like stepper motor skip.
I ran into a similar situation in where the motor voltage on the board was to low.