Print head jogging causing issues...

[Greg3d]

Hi Everyone,
We just got our Rostock Delta Max V2 Printer set up an running for about a month. Prints seemed to be going good with little to no issues then all of a sudden I noticed an odditty in the prints about a cm from the build plate (pic of print included). I assumed it just need more/better(?) callibration, so I sat down and went into the manual again and re-ran the calibration procedure.

No luck, I noticed I couldn't get repeatable results, it was almost like the z level keeps changing occasionally. I then noticed the print head jogs off in a direction about 1 cm from the bed on hitting home (it also seems to do it at near the top). I thought mabey it was a belt issue, took them off and inspected (tightened everything), everything was ok. I flipped the belts just encase. The issues was still there. I next checked the joints and found a sticky one, got some lithium grease and got those suckers lubed up.... still an issue. Took it apart again, found a clip was getting causing a bit of stick (same arm that happened to have the sticky joint)..gave it a light sanding - Issue is still appears in the with the head.

Any other ideas at what the issue is?

I'm not even sure what arm it is, I'm going to disconnect a single arm and run just see if I can narrow it down to which axis is causing it.
If that doesn't work mabey it's a stepper motor? Is there an easy way to check that? I might even go so far as to reflash the rambo and start the process over to rule that out?

Any help would be greatly appreciated. I followed the V 1.5 of the assembly guide and used the links inside it to set up the software.

[Mac The Knife]

Check the setscrews for the pulleys and make sure they haven't loosened.

[Holy1]

You may also want to check that the fan on the Rambo is operating. It can cause very random problems.

[Greg3d]

I thanks guys. I think i tracked it down to the stepper motors, they seemed to be slipping on the belt. I tightened them and re did the lock tight. hopefully that's all it was.