But Do not be dismayed by this alphabet soup. Only some types are in day to day use. Also, makers tend to prevent these overly geeky monikers in favor of more descriptive names alluding to An important quality in the filament, like flexibility (NinjaTek's Ninjaflex and Polymaker's Polyflex, As an example) and toughness (Makerbot, XYZprinting, and U