In the guide that comes with the download zip (the file is called Orca V5.3.X Docs.pdf), read section 3.5, this covers the materials. If I ever do print this, I will likely do it using Polycarbonate Carbon Fiber (PC-CF), namely due to having the means to print this engineering filament well.
There is also a good section found here: https://hoffmantactical.com/learn/filament/ which I would recommend reading. But the TLDR of it is:
"Use Polymaker PLA Pro for testing and your first prints. It will melt at elevated temperatures.
Use Bambu PET-CF or PPA-CF for long term prints. A 0.6 nozzle may be required.
Siraya Tech PAHT-CF or their PET-CF / GF are also worth working with."
