ABS+ NO FURTHER A MYSTERY

But don't be dismayed by this alphabet soup. Only a few varieties are in day-to-day use. Also, brands have a tendency to stay away from these extremely geeky monikers in favor of far more descriptive names alluding to A necessary top quality with the filament, for instance adaptability (NinjaTek's Ninjaflex and Polymaker's Polyflex, As an example)