Abs needs an enclose vented to the outside, or really good ventilation. The ‘S’ in ABS stands for styrene, a fairly potent carcinogen and irritant. Do NOT print it in your living area as it off gasses while printing.

All other plastics you can print on the A1 will be safer.

I’ve printed plenty of different mid density tpu’s including random no name ones with generic profiles, using the Prusa Mini with its Bowden tube. It’s not always a no no.