Diagonal ripples using a RepRap

MB3D · 2015-06-04T15:00:45.000Z

The issue seems to appear along the outline of extrusion, there is no retraction at each 5mm of the outline, i think.

jdsantiagojr · 2015-06-04T15:11:02.000Z

I would first check the extruder and make sure it is snug.

Christiano0o0 · 2015-06-04T15:26:20.000Z

raising the temp make is even more pronounced. The part was printed in PLA but this also happens with ABS. The only filament it doesn’t happen with is ninjaFlex. I believe that is so because of the unique way ninjaFlex behave while its being extruded, in that the it creates a little pressure as its being melted and then extruded

Christiano0o0 · 2015-06-04T15:27:51.000Z

I didn’t want to have to buy stepper drivers, but i might have to

Christiano0o0 · 2015-06-04T15:31:21.000Z

I have done all of the things you mentioned. I will recheck the tightness of the printer. Honestly i think its a micro stepping issue, but i really don’t know much about it and haven’t been able to find much info through google searches

Christiano0o0 · 2015-06-04T15:33:11.000Z

I wish it was that simple. I have already made sure the bed is level and properly calibrated.

Thanks!!!

Christiano0o0 · 2015-06-04T15:43:40.000Z

This was a calibration print. I set a print speed of 40 mm/s but it slows down to about 10 mm/s if the layer print time is below 30 sec. Also I can adjust the extrusion percentage lower but the i have a problem where the walls would be to thin and not printed at the desired thickness. I will keep trying

Thanks for you suggestions

Christiano0o0 · 2015-06-04T16:00:02.000Z

it is a smooth rotation then its stops for a fraction of a sec. I don’t think i have noticed it jump.

Layer height is .25, .4 nozzle, 1.75mm filament, at 40 mm/s print speed(Slowed down to 10 mm/s if layer print time is under 60 sec), heatbed at 60 c, and hotend at 220 c (I use a B3 Pico and due to the design it has to run a bit hotter or else it jets jammed)

This object was PLA but also happens with ABS. Also i have used ninjaFlex and it prints out perfectly. I believe it does so becuse of the unique way ninjaFlex prints out and creates a small pressure in the melting chamber so it doen’t matter if the motor start and stops, as long as the delay is not to long.

Honestly I believe it might be a micro stepping issue in the Marlin Firmware but I have had a difficult time finding and info doing google searches.

Thanks!!!

cdeschrun · 2015-06-04T16:00:21.000Z

This was my first instinct.

Christiano0o0 · 2015-06-04T16:02:38.000Z

I read it and took you suggestion into account

cdeschrun · 2015-06-04T16:03:08.000Z

.

Christiano0o0 · 2015-06-04T16:03:52.000Z

Correct. No retraction in the making of this print

Christiano0o0 · 2015-06-04T16:04:59.000Z

Extruder is nice and tight

Christiano0o0 · 2015-06-04T16:07:31.000Z

I have moved the stepper pots both ways with no success and. PID autotune has been performed on the hotend

Thanks

cdeschrun · 2015-06-04T16:08:10.000Z

What kind of machine is it?

cdeschrun · 2015-06-04T16:31:08.000Z

Swap your extruder driver with another axis driver. Readjust pots. If ok, swap out your extruder. If you still have problem then your extruder is fine and pots fine.

broncosis · 2015-06-04T16:34:19.000Z

What type of control board You could always swap stepper drivers from another axis to see if it changes anything

JOATLabs · 2015-06-04T16:39:06.000Z

Switch the e and z before buying and see if it helps. E is most used and z is least used. If it resolves then you know before making any purchases.

cdeschrun · 2015-06-04T16:48:07.000Z

FYI there is a patent on controlling flow with temperature ( by a big company… I think…)

XMP_LLC · 2015-06-04T20:38:52.000Z

Try reduing the layer height and increasing the extrusion width.
Sometimes the extrusion bead will whip around if there is too much space between the nozzle and the previous layer or the substrate. The whipping tends to be effected by that which it is being deposited on which would cause the pattern you are seeing. It is a sort of positive feedback loop where the phenomena perpetuates itself. Let me know if that helps!