Printer not printing straight

[Sylvane 0]

Hi there guys

I've been printing in ABS for a while using an Ultimaker 2+ at the school for a project, recently the nozzled got caked by ABS and during removal sections where broken. This was repaired by the school's technician however since then, the printer has not been printing in straight lines and when printing, the parts end up coming off. There problem can be seen in the picture below:

What has been done:

Bed temperature increased to 100°C (This improved the time it took before the print came off)

Temperature of the ABS printing has been modified from 250-260°C

Nozzle size has been changed from 0.4 to 0.6 and the nozzles have been cleaned

Recalibrations have been done.

At this point we are unable to print and are in quite the conundrum of what the next step should be.

Please help, thank you.

Edited October 18, 2016 by Guest