I have something new going on. Sometimes the layers are really nice and sometimes they just are not. Seams to be consistent all the way around the part. I am in the process of checking for something loose ect. this may be the infamous Solidoodle banding that they have, i may be getting some wear on the Z screw so that i doesn’t return all the way down after a .5 Z lift. thing: http://www.thingiverse.com/thing:39404
Makes me think i want to add a spring from the build plate to the floor of the bot to keep down pressure on the Z
I do not know what is “infamous Solidoodle banding”, but my i3 did something akin to this when I had loose wire to hotend thermistor (too cold hotend on PID swings caused filament slippage). And try slicing without Z lift, in my experience most of the time it makes print surface uglier.
Check the tension on your X and Y belts.
Looks like backlash to me.
If a belt has some backlash it would be intermittent like this?
It could be skipped steps on Z from the stepper driver overheating. Do you have a fan on the electronics?
Depends on speed and movement.
But it looked alot like that on my printer, before i tightened my belt.
Could also be the head, being lose in the extruder mount.
If it was skipped steps, the whole print would be out of alignment.
I hope that’s just a toy/prop. Any recoil-induced torque from the barrel will make that thing catastrophically delaminate.
@Ian_Johnson Yes i use this board for cooling http://www.thingiverse.com/thing:157515. I had noticed just the slightest deflection in the belts so i tightened them not even 1/2 a turn and it had seemed to fix a roughness at the back of the prints, but then i noticed this. I have seen this intermittently from time to time but never close to this magnitude. While this would suggest the belt tightening would be the cause it seems hard to believe that could be the case. Even so i will loosen the belts back and try a test print.
@Steve_Berry I have dual power supplies running in parallel now. But i understand what you are saying, a power drop out at the mains causing low extruder temps…
@Vaclav_Hula Did you noticve the temp fluctuation from the temp graph in your printing program?
@Michael_Hohensee Rubber band gun http://www.thingiverse.com/thing:39404