There are now (2020) only 3 materials we can recommend to 3D print our planes (category A or B parts):
PLA, PETG and LW- PLA. Let compare them!
This table is the summary of the most relevant material´s properties for a 3D printed airplane.
These properties can change slightly between different filament manufacturer, printing parameters and environment condition such as temperature or moisture.
Data from CNC kitchen
Low warping, easy to find and great tensile strength. Probably the best material for beginners. Nevertheless this material is too brittle, so crash resistant is not good, its glass transition temperature is too low this mean that during hot days or in contact with hot electronic the material will be deformed.
A little bit harder to print than PLA, but their mechanical properties are also a bit better for RC planes. The main advantage over PLA is his higher glass transition temperature so you don´t have to worry about the integrity of your model during hot days. Impact resistance is 60% higher than PLA making this material perfect for belly landing.
If you are really worried about the performance of your airplane, this is your material! density is half of the previous option this mean that you will be able to 3D print airplanes with the same wing loading of old balsa planes! Nevertheless, As you can see in the table its mechanical properties are very different from previous options, our designs are taken into account those properties so you don´t have to worry about the strength of your airframe.
Get it at ColorFabb
*Although you might think at first that LW-PLA is very expensive you should take into account that due to his foaming effect the flow used is 50%, this mean that 1kg of LW-PLA is equivalent to 2kg of PLA.