But Choosing the right filament brand is difficult with all the different manufacturers out there to pick from. Many filaments out there won’t properly extrude and you end up with low quality prints. This usually happens with cheap China made filament, where quality control is lacking. The higher tolerances in diameter and roundness causes issues due to the inconsistent size and amount of material being extruded. If the filament is too thick in areas, the nozzle may jam. When the filament diameter is too thin, the gears in the extruder may lose grip, causing little to no filament to come out of the nozzle.
Another common issue to be aware of in cheaper filament is the presence of voids. If not careful, during the manufacturing process, tiny bubbles create these pockets of air within the filament. These cavities will reduce the quality of the print by leaving voids in the surface. Loud popping sounds when printing is a good indication of these air bubbles as well. This is caused by the rapid expansion of the air and moisture pushing out through the heated nozzle.
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