7

No, that’s very odd. I’d be interested to hear what others have to say.

8

It may be simple. The first thing I thought of is the bed may not bed level and/or the nozzle is not quite close enough to the bed. I’m sure you’ve already checked that though. :slight_smile:

Good luck!

-Michelle

9

Check your belts

10

If it were an extrusion problem, this would happen if your seams were lined up (each layer starts in the same place), but would not appear to be so regular if each layer started in a random location. In the pictured print, does each layer start in the same location? If so, try another print with randomized start points, so you can isolate the cause.

11

Check your belts

12

I have had very similar issues. Your problem is either 1) Your extruder is not firmly held in place so as it moves throughout your print the head will tend to wobble and move around. 2) Your belts are not tight enough resulting in lash which can and will cause things like I see in your picture to happen. 3) Your z axis rods are misaligned. You can check this by moving the z axis up and down and visually seeing if your y axis wobbles as it goes up and down. This is unlikely, as it would not cause the pattern I see in your photos…Trust me, this is not an extrusion problem. It is a problem with alignment and tightness throughout your printer

13

Also, your belts may be already tight. Check the fasteners that hold the belts to the carriages. One of these may be loose causing excess lash

14

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.

15

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

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16

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

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17

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?

18

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

19

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

20

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

21

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

22

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

23

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

Thanks!!!

24

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

25

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!!!

26

This was my first instinct.