Which FDM filament is best suited for 3d printing a load bearing surface?
I am modeling a prototype motorcycle/scooter part with a bottom thickness of 1.5 cm - full density with no hollow areas. The part will need to support weight - sometimes over 500 lbs at two contact points. I need a FDM filament that isn't too brittle, but still has good tensile strength. The part will not be a part of a moving assembly. I'm finding articles that suggest PLA and ABS have similar strength, but nothing definite enough to make a decision before I purchase materials.
Thanks for any input.
2 Answers
PLA should be avoided if it will be exposed to UV, heat, or moisture. PLA was designed to break down and easily decompose so it probably is not a good choice except for a very short term prototype. With that said, if it is for just a short term prototype, it may be hard to beat. It's ease of FDM result in parts with excellent structural continuity. That's something that may be difficult to achieve with other materials unless conditions are perfect.
ABS is probably good but can have issues with shrinking and delamination during printing. Unless precautions are taken with a heated enclosure during printing you may have significant issues.
PETG has about the same durability as ABS and isn't quite as finicky to print. However supports can be nearly impossible to remove.
There are other engineered plastics that can be utilized for 3D printing that many are unaware of:
i like to use polycarbonate from poly max , works amazing for all my RND projects
