Couple of questions to those out there, a) what causes,

[David_Clunie]

Couple of questions to those out there, a) what causes, and is there a fix (other than slowing down the print), for this mirroring/banding, etc. in the xy axis? I have a prusa i3 mk2. I had a b) question too but I think I answered it, was looking to lift z upon finishing so you don’t get that dragging line across some prints when the z makes for a b-line to the home position.

G91 ; use relative coordinates for jogging
G1 Z50 F1800 ; raise Z by 50mm at 1800 mm/min
G90 ; switch back to absolute coordinates

I think I incorrectly used a z<+1/0> or something in my scripts in simplify3d last night which caused the nozzle to just drop straight into my print.

and c) i’m assuming those little spaces are “under excrusions” which oddly it seems that the rear of the bed is more effected vs the front of the bed, which I thought the meshleveling took care of on the prusa i3 mk2… maybe something is out of wack… anywho.

thanks!

-dclunie http://www.dbclunie.com

Originally shared by David Clunie

Couple of questions to those out there, a) what causes, and is there a fix (other than slowing down the print), for this mirroring/banding, etc. in the xy axis? I have a prusa i3 mk2. I had a b) question too but I think I answered it, was looking to lift z upon finishing so you don’t get that dragging line across some prints when the z makes for a b-line to the home position.

G91 ; use relative coordinates for jogging
G1 Z50 F1800 ; raise Z by 50mm at 1800 mm/min
G90 ; switch back to absolute coordinates

I think I incorrectly used a z<+1/0> or something in my scripts in simplify3d last night which caused the nozzle to just drop straight into my print.

and c) i’m assuming those little spaces are “under excrusions” which oddly it seems that the rear of the bed is more effected vs the front of the bed, which I thought the meshleveling took care of on the prusa i3 mk2… maybe something is out of wack… anywho.

thanks!

-dclunie http://www.dbclunie.com

[Daid_Braam]

The banding is what we call “ringing”, it’s the head oscillating due to a sudden change in movement. A lower XY jerk or acceleration value can help here.

[Thomas_Sanladerer]

Try printing the same model with Prusa’s Slic3r build, the profiles for S3D might be slightly different.
Print at a lower temperature to close those gaps.
Check the belt tension on X and Y, they do need to be re-tightened after the machine has finished break-in.

[David_Clunie]

Thanks guys I’ll try those recommendations later tonight! I did see the “rings” dissipate when i slowed the prusa down. I’m still fighting the dreaded “thermal runaway” monster however despite performing a pid autotune thanks to @Thomas_Sanladerer and cnckitchens vids. I’ll have to research some more on that particular issue, seems to only occur with ABS and intermittently, I think i only saw it once with PLA and that was when the fan was blasting at full power! The odd thing is with ABS the fan is set to 0 so maybe its the bed? hmmm. Again will have to investigate. Loving the prusa otherwise!