Biomedical device fabrication

Hello everyone! I am Federico,
I am looking for useful information regarding the fabrication technique and consequently the most suitable materials for manufacturing a device for use in biomedical research. Specifically, the device is about 15x3x3 cm in size and has many empty spaces and channels inside. I am interested in identifying the fabrication method that will allow me to ensure a good accuracy of the geometry, possibly without spending too much money (no exaggeratedly high accuracy required, no too small components). In your opinion, could HP Multi Jet Fusion be a good solution? And possibly, can PP be a good material? I know it is often used for biomedical applications due to its hydrophobic and chemical inert capabilities; however, the part will need to be in a 37°C and high humidity environment for a long time.
Thank you very much to anyone who can help me!
Federico