- Density - 1.27 g/cc
- $44 for a spool - of 1.5 kg - 
- Mcmaster is $36 for 1 mm sheet, 2 square feet, or about 185 cc. 
- Filament is about 1/4 as cheap as sheet. (granted cost may be due to surface finish etc)
- Pellets are cheaper yet. Appear to be $10/kg - . But not $1/lb.