Problem with printer shifting

Hey everyone please view the attachment,
Don't know what else to do. I've tried checking both the x and y axis for binding and they both run smooth. I've calibrated X, Y, and Z as far as how far they travel. Every time I print at some point the X and Y get off set. Any ideas ? I'm printing on a mendel with arduino 1280 and ramps 1.4. I've tried pronterface and repetier software with basically the same results.

Check the locking screw in your motor pulley, it might be loose, check your bearings if they are hold by zip ties.

Is this a new printer, or a printer that was running and now misbehaving?
Makes a big difference.

See this thread: Reprap.org

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My printer: Raptosaur - Large Format Delta - [www.paulwanamaker.wordpress.com]
Can you answer questions about Calibration, Printing issues, Mechanics? Write it up and improve the Wiki!

Thanks for responding. I checked the motors and the set screws are tight. Good suggestions thou...I would never have thought to check that.
Paul, the printer is old. I packed it away when we moved last year and just recently got it out again. It worked pretty well before I moved. It does have me perplexed.

are your belts slipping on the pulleys? or are the pulleys themselves slipping on the motor shaft?

Might also be software/firmware and trying to make too fast moves. Did you maybe have higher printing speeds set in your gcode generator? This can result in missed steps.

Edited 1 time(s). Last edit at 11/14/2014 05:37PM by Ohmarinus.

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http://www.marinusdebeer.nl/

Hey again,
Haven't had a chance to respond lately but still having the same issue (see photo). Many great suggestions but still a weird issue. Took X and Y apart and made sure everything moved freely, Checked and tightened pullies attached to motors, Adjusted pot on X axis but still I get this weird shifting. Have any other ideas ?
On another matter ...When slicing the object, on a few of the prints, the print head was driven into the deck. Upon reviewing the gcode I noticed that Z was first set to 5mm then for all subsequent z moves the decimal was shifted to the left (ie. from 5mm to .5mm). so that when a print started it would drive the head into the deck...guess I'm most surprised that my z stop didn't stop this from happening ?? I struggle along...and wait for some sage advice...maybe I should try changing around the motors

woops.!! here's the photo

Hi again. Since my last correspondence, I replaced the moror on my xaxis , reset all pots , replaced all drive pullys (with metal ones), and still I get this shifting along the x axis (see photo). To recap, the printer worked fine before a move a made (now a couple of years ago). Ever since then
there has been shifting on the x axis for which I don't seem to be able to find a cause. Any ideas would be apprecriated. (see photo)

Hey everyone...anyone who reads this. I managed to solve my dilema. What I did was to go around to each of the pots and adjust while holding the pully of the motor being adjusted. By gently holding the pully i could adjust the pot so that enough power could be delivered...Well ok, now onto the next issue.