Extruder outputs inconsistent diameter and weird offset problem

Hi,

I have a Prusa i3 (single aluminium sheet), assembled by myself. I'm using merlin firmware, don't remember what version, and Pronterface and Cura in the computer (I use the printer always attached to a PC by the way). I use 230 ºC for the extruder, and about 100 ºC for the bed.

I have these two problems, the worst of them, as you can see in the last two pictures, from time to time the printer adds an offset, and everything goes wrong... This offset is always along the x axis by the way.

The other problem, as you can see on all the pictures, specially in the first one, is the inconsistent flow of plastic (ABS).

Ops, sorry, I actually didn't ask anything

The question is, I almost sure the calibration is ok, I have my doubts about the extrusor screws, maybe they need more tension. But regarding the offset I'm totally clueless. Can it be an issue with electrostatic discharges?. Any suggestions?

I am having this same problem with my Makerfarm Prusa i3, the filament flow just isn't consistent. Turning up the heat on my extruder helped a little, but hasn't solved the problem. I think I'm going to take it apart and see if there's something blocking the nozzle.

It seems it was just a problem with the servo being overpowered, and the belts being a bit loose... Happy ending it seems.

We also updated to the last Marlin firmware, and changed speeds mainly...

By the way, we "calibrated" the current just by listening to them, and looking if they became stuck, and now it seems they are working great. Maybe our multimeter is too cheap for precise measure :/

Edited 1 time(s). Last edit at 02/26/2014 10:55AM by kwyjibo.