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Best 3D Printer Filament
Find high quality, low cost spools of 3d printer filament that are compatible with virtually every 3d printer. Castle Ink's ABS filament and PLA filament spools come in 1kg rolls and are 1.75mm in diameter. Choose from a full spectrum of solid, transparent, and glow in the dark colors. All our filament comes with our 100% satisfaction guarantee. Get started now by selecting the type of filament you need below.
Why quality filaments matter to 3D printing
3D printer filament is absolutely critical to the performance and output produced by your 3D printer. It's critical to find high quality replacement filament. We recommend using the 1.75mm filament - since the filament is lighter than the 3mm the extruder motor displaces less mass. It also has the benefit of heating faster, which means you can print faster as a result. In our experience since the 1.75mm uses a smaller nozzle it allows for more precise flow control which reduces the risk of excessive oozing, which can destroy your output. Since it's essentially skinnier we find that the 1.75mm is really more flexible and able to be coiled more tightly plus turn sharper corners.
In an ideal world the diameter of your 3d printer filament would maintain an absolute constant diameter across the entire spool. As a manufacturer, achieving that outcome can be complicated and costly, and so there will naturally be variation in diameter of the filament. We maintain strict standards over the tolerance within which the diameter will be maintained, which prevents serious issues from arising which are usually the result of inconsistent filament diameter. The gold standard across the industry is < .05mm; generally manufacturers of higher quality filament will exceed that level.
Another thing to be on the lookout for is filament roundness. It's important that the filament maintains its consistency across the entire spool. Otherwise the print quality can be affected since the imperfect filament can lead to extruder failure. Even the spool design itself plays a role in the quality of the filament which it holds. In our experience spools where the inner diameter is relatively small can be more difficult to unspool. Typically this is the result of the manufacturer not allowing the plastic to fully cool before coiling the filament. As a result, when the printer gets close to the end of the spool the filament can become very difficult to uncoil and the extrude gear can slip and actually strip off your filament.
Regardless of the manufacturer and the quality of the processes used in the production of the filament, there are environmental conditions which can impact the quality and performance of your filament. Specifically, the absorption of moisture is one of the leading causing of filament deterioration. The small water bubbles caused by the absorption of water can become an absolute nightmare. When the water bubbles are heated at the tip of the extruder they will reach the boiling point and actually explode. Needless to say, the quality of your print will be significantly impacted by this event; plastic will spew out everywhere. Not surprisingly, rice can work very well on moisture, so storing your filament with rice can help avoid this situation altogether.