PLA vs PETG vs ASA filament

PLA vs PETG for brackets and prototypes

Start with PLA for a fit check, an organizer, or a model you want to print with minimal tuning. For a bracket that will be flexed repeatedly or exposed to more warmth, consider PETG and test the part in its intended conditions. Expect to spend more time tuning stringing and checking the right build surface for PETG.

For a fit check followed by a working part, print the prototype in PLA, then run a small PETG test before using a full spool. Recheck the fit after switching material.

PETG vs ASA for outdoor parts

Consider PETG for a small outdoor part if your printer is open and the part can be tested where it will be used. Consider ASA for long sun exposure or hotter conditions if your printer supports it and you can provide an enclosure and appropriate ventilation. ASA’s tendency to warp matters more on a large, flat part than on a small test coupon.

For an outdoor mounting plate, print a small sample with the same wall thickness and fastening method. Check it after exposure to the actual heat and load before printing the full part.

PLA vs ASA for a prototype that will live outside

Use PLA to check screw spacing and clearances indoors. If the final part needs ASA, budget for a second calibration pass. A fit that worked in PLA may need adjustment after ASA shrinks during cooling. Test one joint or mounting hole before committing to the whole print.

Three 1.75 mm spools to compare

Each linked option is listed as 1 kg of filament. Confirm the selected material, color, weight and delivery terms on Amazon. Use the settings for the specific spool and your printer.

• Overture PLA, black. A starting point for prototypes and indoor models. Check Overture PLA on Amazon (paid link).
• Overture PETG, white. An option for functional prints where you want more flexibility than typical PLA. Check Overture PETG on Amazon (paid link).
• Polymaker ASA, black. An option for weather-exposed parts on a printer set up for ASA. Check Polymaker ASA on Amazon (paid link).

These are comparisons based on listed specifications and material guidance. For print setup, see the Prusa material guide.

Compare a single spool, a multipack, or a refill

Divide the delivered cost by the kilograms you’ll actually use. Four 250 g spools equal 1 kg if you can use all four colors. If you only need one, compare that color’s usable weight against the full pack cost. For a refill, include the cost of a compatible reusable spool if you need to buy one.

See the worked cost-per-kilogram example.