How to reduce 3D printing cost: each lever with its saving

To reduce 3D printing cost, cut print hours first, then grams. Thicker layers halved the print time in one PLA (polylactic acid) test, 20% infill used 39% less plastic than solid, and a 5 kg spool costs 20% less per kilogram than a 1 kg one. After that, cut failed prints and color changes, and keep the printer busy.

How do you reduce the cost of a 3D print?

Reduce the hours and grams each good part needs. Print thicker layers or with a 0.6 mm nozzle, drop infill to 15 to 20%, and keep two to four walls. Buy filament in 3 to 5 kg spools or refills. Then cut failed prints and color changes, and spread the printer’s fixed cost over more printing hours.

Each saving below comes from a published test, a manufacturer’s figure or a store price.

Lever	Change	Saving	Trade-off
Layer height	0.12 mm → 0.28 mm	51% of print time	5.5% less tensile force, visible layers
Nozzle size	0.4 mm → 0.6 mm	Up to half the print time	Less fine detail
Infill	100% → 20%	39% of grams, 41% of time	Less toughness; walls make it up
Bulk filament	1 kg → 5 kg spool	20% per kg	Spool sits longer, needs dry storage
Failures	12% → 5% failure rate	7.4% of material and machine cost	Time spent on calibration
Utilization	10% → 25% of the year printing	59% of the machine-hour cost	Needs the work to fill it

Layer height: the biggest time saving

The Swiss retailer Galaxus printed the same PLA hook at four layer heights. At 0.12 mm it took 3 h 42 min. At 0.28 mm it took 1 h 49 min, 51% less, using the same 20 g of filament. Thicker layers save hours, not plastic.

Trade-off: tensile force fell from 32.5 kg to 30.7 kg, 5.5% less, and layer lines show more.

Nozzle size: a 0.6 mm nozzle

Prusa lists “print times up to twice as fast” for a 0.6 mm nozzle against the standard 0.4 mm. In Prusa’s lamp example, two perimeters from a 0.6 mm nozzle replaced three from a 0.4 mm nozzle and cut the print by “nearly 9 hours.” Keep layer height under 80% of the nozzle diameter, which is 0.48 mm on a 0.6 mm nozzle.

Trade-off: fine details and small text soften. Strength did not suffer: Prusa measured up to 25.6% more impact energy absorbed with the 0.6 mm nozzle.

Infill percentage and pattern

In Galaxus’s infill test, the same PLA hook used 23 g and 2 h 25 min at 100% infill, and 14 g and 1 h 25 min at 20%. Each 10% of infill added about 5 minutes up to 90%. The last step, 90% to 100%, added 28 minutes.

The pattern matters too. Prusa puts adaptive cubic at about a quarter less material than rectilinear, and honeycomb at about 25% more material and up to twice the time. Lightning infill uses the least plastic of all, because it only holds up the top surfaces.

Trade-off: Prusa calls 10 to 20% “the ideal balance” and says going above 40% makes “very little sense.” It adds that more perimeters give the same toughness gain as infill above 20%.

Wall (perimeter) count

Galaxus printed hooks with 1 to 8 walls from a 0.4 mm nozzle. One wall took 1 h 31 min and 17 g, and eight walls took 2 h 11 min and 22 g. That is about 6 minutes and 1 g per wall on this part. Galaxus settled on four walls (1.6 mm) as the best balance.

Trade-off: UltiMaker notes that “two extra perimeters often add more strength than raising infill from 20 % → 30 %.” Cut infill before you cut walls.

Buy filament by the 3 to 5 kg spool or as refills

Prices on the makers’ US stores on October 8, 2026, before shipping and tax:

Filament	Price	Per kg
Polymaker PolyLite PLA, 1 kg	$19.99	$19.99
Polymaker PolyLite PLA, 3 kg	$49.99	$16.66
Polymaker PolyLite PLA, 5 kg	$79.99	$16.00
Bambu Lab PLA Basic, 1 kg with spool	$18.99	$18.99
Bambu Lab PLA Basic, 1 kg refill	$15.99	$15.99

The 5 kg spool is 20% cheaper per kilogram than the 1 kg spool. The refill saves $3 (16%), but only if you already own a reusable reel, which Bambu Lab sells for $11.99. The filament cost calculator compares spools per kilogram.

Trade-off: a 5 kg spool sits for months, so store it dry.

Failed prints

A failed print costs its filament and machine time up to the point it failed. At a failure rate f, each good part carries an extra f ÷ (1 − f) of material and machine cost. At 12% that is 13.6%. At 5% it is 5.3%. Cutting failures from 12% to 5% takes 7.4% off that cost for every good part. The failed print cost calculator prices your own rate.

Multi-color purge

On a single-nozzle printer, each color change flushes plastic. OrcaSlicer’s default flush is 280 mm³, or 0.35 g of PLA at 1.24 g/cm³. Bambu Lab’s wiki gives three cuts:

• Fewer layers. Going from 0.2 mm to 0.28 mm layers cut a test cube’s changes from 153 to 111, and its waste from 83 g to 61 g.
• More copies per plate. Nine cubes on one plate wasted the same 83 g as one, about 9.2 g per cube.
• A lower flush multiplier. At 0.8, every flush is 20% smaller.

The multi-color waste calculator turns your change count into grams, dollars and hours.

Trade-off: a flush that is too small leaves tinted layers in the new color.

Supports

Organic (tree) supports save plastic but can cost time. In one user’s PrusaSlicer comparison, a part’s grid supports used 31 m of filament, and organic supports used 21 m. The MK4 estimate rose from 15.5 h to 17.4 h, while support removal dropped from about 2 hours to an estimated 5 minutes. If the part was PLA, the 10 m saved is about 30 g (2.98 g per meter of 1.75 mm PLA).

Trade-off: at $0.51 per machine-hour, the extra 1.9 hours cost $0.97, more than the $0.60 of PLA saved at $19.99 per kg. Count your own time and the 2 hours of removal saved outweigh both.

Machine-hour cost and utilization

A printer’s depreciation, maintenance and overhead are fixed per year, so each printing hour carries less of them when the printer runs more. For an $800 printer kept 3 years with no labor counted, the printer hourly rate calculator gives these rates on its other defaults:

Share of the year printing	Cost per machine-hour
10%	$0.51
25%	$0.21
50%	$0.11

Electricity is the smallest line. At Prusa’s measured 80 W and 18.16 cents per kWh, the U.S. Energy Information Administration (EIA) residential average, an hour costs about 1.4 cents. Cutting hours saves more through wear than through power.

Worked example: one PLA hook

Take the Galaxus hook at 0.28 mm layers and 0.8 mm walls. Price it at the 10% utilization machine-hour rate of $0.51, which includes electricity.

	Before	After
Infill	100%	20%
Filament	23 g from a 1 kg spool at $19.99	14 g from a 5 kg spool at $79.99
Print time	2 h 25 min	1 h 25 min
Filament cost	23 × $0.0200 = $0.46	14 × $0.0160 = $0.22
Machine time	2.42 h × $0.51 = $1.23	1.42 h × $0.51 = $0.72
Cost per hook	$1.69	$0.94

The two changes cut the hook’s cost by 44%. Machine time was the larger line in both cases. Print enough to reach 25% utilization and the machine line falls to 1.42 h × $0.21 = $0.30, for $0.52 per hook. Put your own grams, hours and spool price into the print cost calculator to see your saving.