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notes/3D printing/Filament.md
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@ -156,3 +156,22 @@ Also known as acrylic plexiglass, the high transparency of PMMA is the only adva
| -------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| - Highest transparency thermoplastic<br>- Can be buffed to a frosted/polished surface<br>- High UV resistance<br>- Relatively affordable<br> | - Horrible bed adhesion<br>- Bad layer adhesion<br>- High coefficient of thermal expansion leads to constant print failures during or after the printing process<br>- Very brittle<br>- High water absorption |
# TPU (Thermoplastic Polyurethane)
TPU is the most common flexible filament
| Pros | Cons |
| ------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| - Flexibility<br>- Cheap<br>- Wide range of colors and hardnesses<br>- Perfect layer adhesion<br>- Basically shatterproof | - Permanently bonds to most build plates (use gluestick)<br>- Very high water absorption, needs to be dry to print well |
## Variants
### TPU (~99D)
- Harder than a skateboard wheel
- Basically rigid
- Useful because it's "shatterproof"
- Often used for combat gear or robotic applications
- Easiest TPU variant to print
### TPU (~80D)
- About as hard as the sole of a running shoe
- Good for things like bumpers or hinges
- Still fairly easy to print
### TPU ()