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Dear friends… I a a filamant manufacturer from India, I have setup a small filamant production machine (30m/min). I am manufacturing it for 3d pen. I am facing a problem… When I make filament of pure abs with no colour added, it prints fine… but as soon as I add up some pigment in it, it starts giving alot of bubbles. And it happens only when I add pigment in the abs… kinfly anybody guide me about its solution. Is there any additive to be used along with pigment? The green is coloured and gives bubbles

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Hi there,

Could there be any moisture in the pigment? This would cause bubbling and sizzling when it’s extruded.

Best,

Maddie - 3D Hubs

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The scenario here is strange, I produced a small quantity of pure filament and then a small quantity of coloured filamant… used them right after production both worked fine, then used after 4-5 hours both worked almost fine, then used after 24 hours… pure still worked same but green started bubbling… so ot seems that a coloured filamant absorb moisture at greater rate… :frowning: but I have a lot of chinese filamant, they don’t do so… I doubt they add some additive or there is some special pigment for this purpose.

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What kind of pigment? you should use inorganic heat resistant pigment with ABS, otherwise you boil it.

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Usually, bubbles comes from moisture inside the filament. According to wikipedia :

“Many engineering polymers are hygroscopic, including nylon, ABS,polycarbonate, cellulose, and poly(methyl methacrylate).”

Make another batch and test if you have the same bubbles.

Good luck

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Thanks for guiding me… can you tell what is specific market or industrial term being used for these? As I doubt people in market will not understand inorganic pigments… Thanks