Check out the canon printed entirely with colorFabb materials. We have printed this entire canon with steelFill and the basis was printed with one of our other special filaments: woodFill
You can see how to print with steelFill on our tutorial page: https://learn.colorfabb.com/how-to-print-with-steelfill/
Design: by Labern – https://www.youmagine.com/designs/colorfabb-cannon
steelFill is available now: http://colorfabb.com/steelfill