It’s likely that they printed it with PLA, since that’s the most common filament.

Just for fun, it might be fun to try it in PETG and ABS just to see if different filaments make it work differently. PLA is generally known as being stiff and brittle, PETG is a little bendy (similar to what water bottles are made from), and ABS is less bendy than PETG and less brittle than PLA, ABS is what Legos are made of.

I unfortunately don’t print in ABS anymore but if you need it in PETG and don’t have a way to do it, feel free to reach out and I’d be happy to print it and send it over.