Diagonal ripples using a RepRap

JOATLabs · 2015-06-04T13:44:07.000Z

I just dealt with this on a solidoodle 3 (direct drive extruder). It was a failing extruder stepper driver. I replaced it and the pulsing went away.

broncosis · 2015-06-04T13:50:36.000Z

To be honest your extrusion looks not bad Are the parts well bonded If your having extruder problems other things typically go wrong this is very consistent I had said to check your belts I am sorry for the double post But your bearings could be warn or loose in there mounts

CLau · 2015-06-04T14:19:35.000Z

Adjust your X and Y motor pots on your board. This happens when your motors are pulsing from the lack of current, giving you the “moire” effect. *edit* Down voted for no reason. Guess I won’t give any advice here anymore

Brad_3 · 2015-06-04T14:43:31.000Z

Have you adjusted the nozzle temp? I’ve been able to fix a lot of my issues like this just by raising the print temp up. Just out of curiosity, is that ABS?

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.