I am trying to print 1.75mm ABS filament with official J-Head mounted to Bulldog Lite. Seeing bubbles on the outside of prints.
What would you guys recommend I change or look at on machine to fix.?
The top layer looks good and smooth, but I can’t tell for sure. Is it?
The perfect periodicity of it, and the fact that it’s only on the outside perimeter, makes me think it’s related to the x/y motion system.
Do you get that pattern on all four sides, or only two?
Bubbles? You mean those uniformly spaced blobs? I get the feeling that those are from the extruder hitting the outside wall and maybe going a touch outside of the wall when doing infill. Check your infill settings. In Cura, there is an expert settings tab with the amount of overlap you should have. Also, are you sure you are not over-extruding?
Yeah. Another shell is another way to fix it, I suppose.
What slicer anyways?
Using Simplify3D
@Stephen_Baird I get the pattern on all four sides. Top is smooth but I see variation of line width.
@NathanielStenzel Going to increase shell and give it another go.
Wouldn’t infill marks be vertical? Likewise, any repeating XY motion system issues would be vertical.
Print a cube of slightly different size. Like scale up or down the model by 5% and re-print. Does the angle of the lines change? If so, it’s probably an extruder-related issue.
One thing that can cause this is a stepper/driver mismatch, like running a low-inductance motor with DRV8825s. It will cause pulsing motion due to skipped microsteps.
@Ryan_Carlyle That could be. I am running Bulldog Lite with Smoothie board. The Bulldog came with a motor; will try siping it out with my old motor.
I get the same thing http://i.imgur.com/G10zgrE.jpg and I’m 100% sure, no, make that over 9000% sure that isn’t infill in my case because that cube is hollow with no infill at all. The pattern is the same across every side of the cube, almost like a screw thread.
Pretty sure the slicer I used for that one was skeinforge
Maybe it is motor stutter if it is not infill related. Some stray signal could be causing x,y,z motors to buzz intermitantly.
@John_Santiago Genuine Smoothieboard or one of the copies? Genuine Smoothieboard doesn’t have this problem because it uses 4988s. Some of the copies use 8825s and often have ripples in prints.
Another thing that can do this is a motor with the wrong specs, like coil resistance way too high, so yeah, trying a different motor is a good idea.
@Ryan_Carlyle Running a Azteeg Mini V1.1. Def. going to put the old motor back on.
@Steve_M Did you fix the issue with your prints?
@Mark_Rehorst 4982 and 4988 have identical functionality as far as motor current control, the only differences are missing 1/8 stepping and chip package types. They’re equivalent in my mind.
@John_Santiago The Azteeg x5 v1 uses 8825s. Rippling motor motion is a known problem with that board and certain motor/PSU combos. The problem should go away if you switch the drivers to fast decay mode, or you can try different motors to find one that has higher resistance/inductance.
@John_Santiago no, I just learned to live with it.
It’s not likely to be mechanical resonance because the overshoot ripples would fade as the extruder travelled away from the corners, plus the effect would not be vertically slanted.
My guess is over-extrusion.
Generally infill is going to produce vertical lines. First try printing it at 0 percent infill. That will make sure that it isn’t an infill problem. After that I would have to agree with the others that it is most likely a motor inductance priglem
Show us a picture of your idlers, those look like the marks you get from running the toothed side of the belt over a smooth surface instead of a proper idler.
What kind of printer? Using tilt compensation (“auto-leveling”)? Looks like it could be a particularly nasty rounding error.