Filament Guide
PLA Filament Guide
The default choice. Easy, affordable, good-looking.
Last updated: March 2026
PLA
Polylactic Acid
The default choice. Easy, affordable, good-looking.
Beginner
#1 Most Used
PLA is the most widely used 3D printing filament in the world, and for good reason. It prints easily at low temperatures, requires no heated bed, and produces minimal odour. It's derived from renewable plant starch - corn, sugarcane, or tapioca - unlike most filaments, it comes from plants instead of petroleum.[1]
Invented in the 1930s but only mass-produced affordably from the 1990s onward, PLA became the default hobbyist filament when desktop FDM printing took off around 2010.
Its main weakness is thermal sensitivity — PLA softens around 60°C, which means it warps if left in a hot car, used outdoors in summer, or placed near any heat source. If your part needs to handle heat or live outside, PLA isn't your material.
Chemistry
Aliphatic polyester derived from fermented plant starch (corn, sugarcane)
Invented
1930s - mass production from ~1990, FDM adoption ~2010
Print Temp
Heat Resistance
Softens at ~60°C[2] - poor for outdoor or high-temp use
Biodegradable?
Industrial compost only - not home compostable in practice
Popularity
~60-70% of all consumer FDM filament sales worldwide
Pros
- Easiest material to print - very forgiving
- Low odour during printing
- No enclosure needed
- Excellent detail and surface finish
- Lowest cost per kg of any filament
- Available in hundreds of colors and finishes
- Good stiffness and dimensional accuracy
- Biodegradable under industrial conditions
Cons
- Brittle - snaps under impact rather than flexing
- Softens at ~60°C (bad for car interiors, outdoor sun)
- Absorbs moisture over time - store sealed
- Not UV stable - yellows and degrades outdoors
- Lower layer adhesion than PETG or ABS
- Hard to post-process (acetone doesn't work)
Best Used For
Figurines & miniatures
Prototypes
Display models
Cosplay props
Desk organizers
Cable management
Educational prints
Low-stress brackets
Niche Tips
Silk PLA has metallic sheen but is more brittle and prone to stringing than standard PLA.
Cold pull maintenance works well with PLA - heat to 200°C, cool to 90°C, then pull firmly to clean the nozzle.
Annealing trick: baking finished PLA prints at 80-90°C for an hour can push heat deflection up to maybe 80°C — enough to survive a warm car, not enough for real heat. Parts will warp slightly during the process; design for it.
PLA is hygroscopic but less aggressive than Nylon or TPU. Wet PLA shows as bubbling/popping sounds and rough surfaces. Dry at 45-55°C for 4-6 hours.
Storage & Humidity
Target: below 45% RH. PLA absorbs moisture slower than PETG, Nylon, or TPU, but you'll still hear popping/bubbling within a couple weeks of open-air storage in a humid room. Sealed container with silica gel keeps it good for months.
Drying wet PLA: 45-50°C for 4-6 hours in a food dehydrator or oven. Do not exceed 55°C - PLA softens and spools can deform or fuse at higher temperatures.
Signs of wet PLA: audible popping during printing, rough or bubbly surface texture, stringing that wasn't there before. A fresh roll dried for 4-6 hours usually fixes all of these.
Bed Adhesion
Best surfaces: PEI (smooth or textured), blue painter's tape, glass with hairspray. PLA is forgiving - most surfaces work well.
Recommended bed temp: 50-60°C. Technically optional, but a heated bed dramatically improves first layer consistency and is worth enabling even if your slicer marks it optional.
Release: PLA lifts cleanly from PEI when cool — textured PEI gives a satisfying pop-off. If it's stuck, just wait for the bed to cool completely.
Avoid PETG on the same PEI sheet you use for PLA without a release agent - PETG can bond aggressively to bare PEI and damage the surface.
Variants & Special Types
PLA+PLA blended with impact modifiers for better toughness. Same ease of printing, same heat limits. See the dedicated PLA+ guide.
PLA ProPremium PLA with better layer adhesion, less stringing, and tighter tolerances. Often high-speed compatible. Formulation varies by brand.
PLA High SpeedLower viscosity formula designed for 80-300mm/s printing. May sacrifice fine detail at extreme speeds. Increasingly common as fast printers become mainstream.
PLA-CFPLA reinforced with chopped carbon fiber. Dramatically stiffer, matte finish, reduced warping. Slightly more brittle. Requires hardened steel nozzle - brass wears in hours.
PLA ESDElectrostatic dissipative PLA for handling sensitive electronics. Surface resistivity prevents static damage. 3-6x the price of standard PLA.
PLA Metal FillPLA blended with iron or stainless steel powder. Very heavy, can be polished or rusted for realistic metal appearance. Extremely abrasive - hardened nozzle required.
References
- Prusa Knowledge Base - PLA. Print temperature, bed temperature, and material properties. help.prusa3d.com/article/pla_2062
- Bambu Lab Wiki - Filament Guide Material Table. Glass transition temperatures and printing parameters for common filaments. wiki.bambulab.com/en/general/filament-guide-material-table
Frequently Asked Questions
Is PLA food safe?
PLA is generally recognized as food-safe in its raw pellet form, but FDM-printed PLA is not recommended for food contact. The layer lines create microscopic grooves that harbor bacteria, and most colored filaments contain additives that are not food-grade certified. If you need food-contact prints, use a food-safe epoxy coating or consider a different manufacturing method.
Can PLA go in a dishwasher?
No. PLA has a glass transition temperature of around 55-60°C, and dishwashers typically reach 60-75°C during wash cycles. PLA parts will soften, warp, and potentially collapse in a dishwasher. Even hand washing with very hot water can deform thin PLA prints.
Does PLA biodegrade?
PLA is compostable under industrial conditions (58°C+ sustained heat, specific moisture and microbial environment) but does not meaningfully biodegrade in a home compost bin, landfill, or ocean. In practical terms, discarded PLA prints behave like conventional plastic waste unless processed at an industrial composting facility.
At what temperature does PLA start to warp?
PLA begins to soften at its glass transition temperature of approximately 55-60°C. Parts left in a car on a hot day, near a window in direct sunlight, or close to heat sources can visibly deform. Annealing PLA prints at 80-90°C can raise heat resistance somewhat, but for parts that need to withstand sustained heat above 50°C, PETG or ABS is a better choice.