aniketb 0 Posted June 25, 2014 in Extruder Shift Hi, I have this strange problem. After long duration of print, extruder shifts in X-axis direction. Please refer image. The cylinders shown by red lines are original lines and yellow line shows cylinders after shifting. Can anyone help me. Share this post Link to post Share on other sites
antiklesys 3 Posted June 25, 2014 in Extruder Shift First of all: check your pulleys and ensure they are properly tightened Share this post Link to post Share on other sites
nallath 530 Posted June 25, 2014 in Extruder Shift Did it show in the layer view? No? Then it's most likely not a cura problem (but hardware; tighten those pulleys!) Share this post Link to post Share on other sites
gr5 897 Posted June 25, 2014 in Extruder Shift Sudden shifts in only one axis are almost always fixed by tightening the set screws on the pulleys. There are 6 pulleys on the X axis (not 4) and the 2 on the short belt are the most likely that are slipping (the one on the stepper and the one on the other end of the short belt). The UM Original usually comes with a second set of spare set screws that are shiny (the originals are black). The shiny ones are better although most people are fine with the black ones but you have to tighten the hell out of them. If you don't believe me mark your pulleys and shafts with a permanent marker so you can see if the pulley slips. Less likely causes are high friction in the X axis or rubbing belts against the case but those usually cause gradual shifts - not sudden shifts like this. Share this post Link to post Share on other sites
aniketb 0 Posted June 26, 2014 in Extruder Shift I am using motor which has flat shaft, and pulleys are properly tightened, no sign of slip. This problem is happening almost after 30Hrs. I think this may be because of stepper driver. (May be motor is stalling in between). Share this post Link to post Share on other sites
Dim3nsioneer 360 Posted June 26, 2014 in Extruder Shift If your stepper driver has an overcurrent and temperature protection you might have run into the temperature protection. Maybe improving the cooling of the stepper driver could solve your problem? Share this post Link to post Share on other sites
gr5 897 Posted June 26, 2014 in Extruder Shift no sign of slip Still this is extremely common cause. Mark the shaft and the pulley with a tiny dot with a permanent marker. If a limit switch signal is triggered you get the same sort of pattern where you get a sudden shift in one layer. How is the friction of your two axes? Push them around by hand with power off. Maybe you need a little light oil? Maybe belts are too tight? Share this post Link to post Share on other sites
mikk36 0 Posted June 26, 2014 in Extruder Shift Could as well be that the printed material curled up, hardened and the nozzle hit it, making the stepper skip steps. Share this post Link to post Share on other sites
