Case resolved after switching to vector printing!
RhinoWIP Version 6 WIP (6.16.19141.12096, 2019-05-21)
on MacOS Mojave 10.14.1 / Macbook Pro Retina 2014
Many files imported from Rhino 5 for Mac or opened with RhinoWIP 6 do not print on a HP Color Laserjet Pro M476. The printer does not accept the file (that is what the print dialogue says after the printer was “thinking” about the file for a long period of time). While “thinking” the printer freezes/crashes and can only be re-activated by a hardware reset.
Similar with PDFs exported from RhinoWIP 6 through the print dialogue: THe PDF displays ok on screen but would not print. Same message as when printing from Rhino: File not accepted.
Thanks for looking into this problem!