PLA is the default FDM material for a reason: it is the cheapest mainstream filament, prints easily without an enclosure, and comes in every colour imaginable. A standard 1 kg spool costs $20–30 from reputable brands, which works out to $0.02–0.03 per gram. Budget multi-packs dip below $15/kg; silk, matte and glitter finishes run $25–40.
What a PLA print costs
A 125 g model from a $25.99 spool uses $3.25 of material. Add roughly $0.27 of electricity for a 6-hour print, $0.41 of printer wear and any of your time, and the true cost lands near $7 — still the cheapest way to put a custom object in your hand.
Cost tips for PLA
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Buy 2–4 spool bundles of your workhorse colours — per-kg price drops 15–30%.
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PLA is forgiving of higher speeds: shorter prints mean less electricity and machine time.
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Use 2–3 walls with 10–15% infill for decorative parts; extra infill is money inside the part where nobody sees it.
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Keep spools dry: stringing and failed surfaces from damp PLA waste more money than a dry-box costs.
When to spend more than PLA
PLA gets soft around 55–60 °C and is brittle under sustained load. For parts that live in a car, outdoors, or under mechanical stress, step up to PETG or ABS — the material cost difference on a typical part is well under a dollar.
Frequently asked questions
How much does PLA cost per gram?
Standard PLA is $0.02–0.03 per gram ($20–30 per 1 kg spool). Specialty finishes like silk or matte run $0.025–0.04 per gram.
How many prints do you get from one spool?
A 1 kg spool prints roughly 8 large models (~125 g), 20 medium ones (~50 g), or hundreds of small parts — minus 5–20% for supports and the occasional failure.
Is cheap PLA worth it?
Often, for prototypes. But inconsistent diameter causes failed prints, and one 100 g failure erases the $5 you saved on the spool. For sellable parts, stay with brands you have measured.