Description: This article contains some of the most frequently asked questions about PLA and PLA+ Filament from Summer 2019.

Q: What is PLA filament?
A: PLA filament (Polylactic Acid) is a type of thermoplastic that is derived from renewable resources such as corn starch or sugar cane. It is used in 3D printing and is typically used for food containers, biodegradable medical implants, models, and prototype parts.

Q: Why would I use PLA filament?
A: PLA filament is very easy to work with which makes it perfect for beginners in the world of 3D printing. It is less prone to warping than other filaments.

Q: Why wouldn’t I use PLA filament?
A: While a great filament overall, PLA is prone to clogging, and attracts water molecules, making it very brittle over time. PLA clogs are usually easy to resolve however and gives you valuable experience in learning how to troubleshoot your printer.

Q: What temperatures do I print PLA at?
A: While the exact temperature will vary based on your printer, the filament you are using, and your preferences, the recommended range of temperature for PLA is 205-220°C, and 60-80°C for the bed temperature. You are not required to use a heated bed; however, it does make the process much easier.

Q: What is the difference between PLA and PLA+?
A: PLA and PLA+ are actually very similar filaments. PLA+ however, has extra ingredients added to it to alter its properties. Unfortunately, there is no standard of PLA+, so each company will add its own ingredients, which will change certain properties, and may change the temperatures you will need to use to print with.

Q: What sizes of filament do I need?
A: The size of filament that you need will vary based on your printer. Currently there are 1.75mm and 2.85mm filaments available. Usually printers will only support one of these sizes, so ensure you are using the correct size.

Q: Why is there 3.0mm filament listed online?
A: 3.0mm filament is another name for 2.85mm filament. It was originally used as an easier way to purchase filament, rather than using a rather specific number of 2.85mm. However, over time some manufacturers did not realize this and started making 3.0mm filament, so be sure to check the size in the specifications for the filament. This will normally be listed as true diameter and should be listed as 2.85mm rather than 3.0mm. 1.75mm filament however does not have this issue, and you can purchase it without issue.

Q: What print speed should I use when printing with PLA?
A: The exact speed will vary based on your printer and your personal preference, however typically 30mm/s - 40mm/s is the recommended print speed.

Q: What retraction settings should I use?
A: Retraction settings (speed and length) will vary greatly based upon your printer, what type of extruder you are using, and what filament you are using. To fine tune this based on your printer, you can follow this guide: https://www.matterhackers.com/articles/retraction-just-say-no-to-oozing.