CNC machined polyoxymethylene (POM), Delrin, by Protolabs. In this case, the surface is "as machined", which means no further surface treatments have been used, which helps to keep costs to a minimum. It is possible to improve the finish with bead blasting as well as painting. Image Protolabs Network.

CNC machined polyoxymethylene (POM), Delrin, by Protolabs. It is available in black and white. Image Protolabs Network.

3D printed glasses in in Ultem polyetherimide (PEI) by Weerg. This looks like Ultem 9085, which is a high performance material suitable for complex applications in the automotive, aerospace, and transportation parts. It is certified to UL94-V0 (flame retardant), EN45545 (railway), FAR25.853 and OSU55/55 (aerospace). Ultem 1010 is certified for use in applications that require direct skin contact, meeting strict biocompatibility standards. Image Weerg.

A CNC milled fountain pen in Ultem polyetherimide (PEI) produced by Schon DSGN, Philadelphia. Image Schon DSGN.