Help nearing wit’s end. Converting from simple beta to final version has crippled the printer for last 4 months.
Still having problems with my +printrbot, slanting in x direction (slant depends on rotation of objects too). It’s probably not string tension. The line plays a high C when plucked.
I’ve narrowed it down to the travel speed related. Default is 130mm/s, which makes approx 15° off vertical. At 30mm/s I almost get straight walls.
My test is printing two hollow 20x20x10 squares at the far X edges of the build platform. They are slanted in X every time. Printing a single square anywhere on the platform works fine.
So is this caused by loss of steps in one direction at higher speed? More steps lost at higher speeds? Some friction at one end of range (can’t feel it). Anyone else seen something odd like this?
Just to add to the weirdness, the flower box shape will tilt up right normally but when I rotate it 180 in Z it tilts up left. Travel happens in that print across the diagonal. That probably rules out friction.
I am currious if the pully could be slipping on the stepper.
Would be easy to check a bit of maker on the pully/shaft.
Also did you rotate the sliced file 180 deg. If you did it indicates that the printer is misbehaving with a specific action in the print. Finding the action that causes the tilt could help find the cause.
If belts are tight, it’s either the pulley slipping on the stepper motor shaft or the stepper itself. Assume you’ve increased the current to the stepper? Try swapping X and Y stepper motors. If the problem moves to y it’s your stepper, if not, try swapping drivers (if they can be swapped).
@Camerin_hahn can rotate the object 180 and get slant flipped.Not sure how to rotate sliced file (G code?).
@Tim_Rastall Printrbot simple uses tubing over the stepper shaft. I’ve replaces it twice with different materials. It’s held by a single zip tie. I tried to replace that with a corbin clip but they are too wide to fit.
I had slant on 1 axis and I removed the tubing on motor shaft, added 200grit sandpaper and glued it to the motor shaft. I then reattach string without tubing, recalibrate and enjoy. I all my slants disappeared.
@Alan_McNeil Try slicing with a different slicer. If you’re using Slic3r inside Repetier, try using Kisslicer instead and load the exported GCode into Repetier. See if anything changes.
So, perhaps some glue might be in order? or cutting some longitudinal grooves in the motor shaft to provide more friction for the tube.
@Niclas_Oberg A variation on that may be tomorrows project. I’ve already replaced the clear tubing with black rubber tubbing from a slingshot. Much stickier that the clear stuff.
A variation on the @Niclas_Oberg suggestion - I stripped all tubing off the motor shaft and abraded the shaft. I used a Dremel with a grit wheel and lightly ground the shaft longitudinally. Seemed to help.
I had the similar issue with the #printerbot simple, after calibrating the XYZ axis and Extruder this issue no more.
This is my #calibration value
M92 X91.29 ; calibrate X by Thalib
M92 Y94.51 ; calibrate Y by Thalib
The calibration value by #printrbot is here https://github.com/Printrbot/Printr-Configs/blob/master/Config-Simple.gcode
Hope this helps.
You could try a simple spring, like I used on mine: http://www.printrbottalk.com/forum/viewtopic.php?f=107&t=4275#p34194
Not sure your issue is the same, though.
@Jim_Peterson I like your spring idea a lot!
The other idea in that post "Slic3r option “dont cross perimeters” can move outside the limits seems far fetched but it’s worth checking. I believe I had the squares in 6mm from X bounds.
@Mohamed_Thalib_H I have calibrated 80 x 80 x 2 mm squares. My setting are close to printrbot’s, with old tubing 117, with new x 120 and y 119. I’ll look at it tomorrow. If it’s hitting X low limit, it would shift the origin left causing the the slant. But it changes with speed, puzzling.
Acceleration springs in mind. When the printer travels greater distances it gain lots of speed and momentum. When it stops, the tubing can slip on motor shaft if your zip ties are not good enough (stock are too small)
Many posts regarding this issue on Printrbot forum.
The sandpaper trick is from simple upgrades to v2
