We have printed with TPU filament last week, the material is similar as nanjaflex. Hot bed is helpful for the adhesive with first layer. The speed need to be much lower, about 30 mm/secby Barret Cheung - Polymer Working Group
Polycarbonate has high melt point, Most of 3d printer cannot support this material. You could have a trial with PMMA or PC/ABS. PMMA has the similar opacity as PC.by Barret Cheung - Polymer Working Group
Actually hips has similar properties as abs. The impact strength is lower than ABS. If you don't have special request for part, HIPS could replace ABS in some time.by Barret Cheung - Polymer Working Group
PLA is hard to adhesive to tpe material. You could have a trial with tpu, both are flexible materialby Barret Cheung - Polymer Working Group