Hi All! Could somebody explain this noisy, randomly points(little bubbles) on this shape?
Must be PLA using Slic3r. ?
its ABS
The filament may have drawn water. Heating the filament in the oven at 80 ° C for 1h and then print then.
I’m curious because sometimes happens also to me. I try to give myself some explanation: 1. possible point of retraction or repriming on layer change (you can analyze your gcode with, for example, http://gcode.ws website that shows also retraction and repriming) 2. possible vibration on the bed, if the vibration is Z directed the tip of the hot end changes distance from the layer underneath resulting in squeezing the filament laterally… but I don’t know if I’m right; someone can confirm or have different explanations?
Yes could be moisture in the filament. Try using Cura instead of Slicer.
You have calibrated?
Its sometimes caused by too much temperature in the hotend. Cooling by a few degrees may help?
There is so many things that can cause this.
I have a roll of filament (ABS) which does exactly this.
Cheap filament which contains contaminants.
Other possibilities are moisture, but only ever have I had that on nylon so I doubt it.
Temperature too high, and boiling. Try dropping the temp.
Ensure heater and temperature sensor are secure.
Honestly though, my vote is on cheap filament as it’s so far apart and so random.
Do you print from SD card ?
As @Wayne_Friedt said there are many things that could cause this, most likely it is some sort of filament quality issue if it is truely “random”. if you print somewhere that isn’t a desert it is likely that there is moisture in the filament(because you print above 100C the water in the filament boils and expands making small bubbles in the molten filament). I saw a paper on this once, for injection molding, it mentioned that the filament could absorb moisture within hours of leaving the dryer. i live on the coast, so keeping my filament dry is a loosing battle.
@Artur_arteq_Wronowsk Yes,
printed from SD card,
temp 230C,
ABS,
Noozle 0.5,
using Slic3r,
extrude at 180mm/min
Do you have randomise start/end layer true? Could be a retraction issue.
As others have said, it could be moisture. I see this when when using Makerbot and protoparadigm ABS. It is accompanied by small puffs of steam and occasional audible popping while printing. We have a large rubber maid container that we throw a few bags of dessicant in with the spools to dry up. As @Camerin_hahn mentioned though, or filament gets moisture just from a short amount of time on our machine. We’re looking to kludge some type of box around the spool feeders so we can throw some dessicant in there as well
My bet is the temp is too high for the filament
Try running the nozzle temp calibration mentioned here http://reprap.org/wiki/Triffid_Hunter’s_Calibration_Guide
Can also be air bubbles in the filament. Many extrusion lines use tube extruders and will have small holes in the middle.
Another cause is if there is either slippage in the extruder or friction that builds up some spring length before the material comes out. To this same effect, fluctuations in temperature would act to cause that friction.
I’ve beem struggling with with this but just on interior walls with y axis travel.
I think your problem looks like moisture though.
I got exactly the same bubbling here for awhile when using Slic3r and Kisslicer. Can even hear the hotend fizzle when it happens. Air traveling up the nozzle?
Even though I like Kisslicer alot I’ve been giving Cura a run for its money recently and the bubbles are gone. I am pretty sure my temps are the same in all three slicers so it must be something else. Retraction setting?
As usual too little time for a closer analysis.
will try CURA this evening