It's plastic with some wood fibers in it.. I had the same experience.. Ended up using transparent ink and paint with an airbrush to paint my chess pieces to look like wood. Luck the designer had split them so they could be printed laying down which makes the lines made by the printing process look sort of like wood grain. There is a online program I found that will take your gcode and alter the temp so the print will have different varied darkness but still does not look like wood to me..