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I’m pretty new to printing and while I have worked out a lot of bugs I cant seem to fix this one. On most prints it starts out fine and after several passes the lines become jagged and incomplete. I have tried changing filament,temp,nozzle height,speed all with no luck. The pictures show the issue. Thanks!


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The printer is an Alunar Anet A8

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Hi Matt,

It looks like you are extruding too much plastic, what slicer are you using? There should be a setting to reduce the extrusion multiplier setting or you can adjust the extruder steps per mm in the printer configuration.

Here’s a link for calibration be it may be slightly different on your machine.

Regards

Matt

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I actually thought the same thing and even when I drop the multiplier incrementally all the way from 1 to 10 percent it continues to be jagged. The problem is intermittent as well. some prints I have the error and some I dont. I can even literally print the same object gcode with no changes to the code or the printer and it will work one time but fail the others. I tried using both cura and slicer. Ive taken the whole extruder apart and cleaned it figuring maybe it was blocked with no luck either. tried new hot end as well.

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How are you leveling your bed? Does this only occur on the first few layers? Also, what kind of material is this? I notice this sometimes with ABS, but only if I print a skirt. Maybe your extrusion width is off?

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I am leveling the bed it has auto level but ive also been checking manually due to this issue, this happens throughout the entire print, and it happens with both pla and abs. I havent really played around with extrusion width much but i just checked and the value is set correct i think.

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Your printer is definitely trying to put too much plastic into too small of an area. Check other things like diameter of the filament (i.e. grab some digital calipers and measure the diameter of your filament at several points and use the average). I have found that cheap plastic will often change in diameter through out the spool and cause this inconsistent blobbing issue. If your software allows it, check how much overlap you have between lines. Make a sanity check on nozzle diameter.

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I turned down the multiplier by1- 10% incrementally and it didnt help the issue. also just checked. the filament is ok(i tried 4 different spools with the same problem) nozzle diameter is good too. I just checked diameter on a new one then I have and put it on/ tested. no change. as for the overlap the only thing I could find was infill overlap is 10 percent. it said something about the overlap is used to attach infill to walls. 10% was the default from the manufacturer. No idea if thats too much or too little or good.

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10% overlap should be fine. Have you calibrated your extruder? The extrusion multiplier is good at fine tuning for variance in filament thickness, but if your extruder isn’t calibrated, it won’t be enough. Made_Reality posted a link to an instructable that takes you through the calibration process.

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Yeah I did calibrate it. I mean its possible I messed something up ,but I dont think I did. Like i said in one of my posts the problem is intermittent. Most come out messed up, but here and there it will print correctly. That’s with not changing anything in the gcode or with the printer in between the attempts either. Maybe 1 in 10 or less end up printing without issues if I’m lucky

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OK. The only other thing I can think of that would cause what I am seeing in the pictures is that something is wrong with your Z-height. Is this a problem that only happens in the first few layers, or does it happen at any height? Your pictures only show the very first layer. Are you putting the nozzle closer to the bed on the first layer to get better adhesion?

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I just saw your response to a similar question that someone else asked. Will you please post some picture of finished parts that have this problem?