Polywood filament is a material that simulates a wood look. It has no wood in it though, and it shouldn't clog your nozzle. It requires some finetuning before you get the desired result though.
Polymaker suggests quite a high temperature, but in practice this gave me very poor results on my Ultimaker 3. It seemed to clog my nozzle a little bit despite Polymakers claims that it shouldn't.
I printed samples at 190, 195, 200, 205 and 220˚C. The 190˚C and 195˚C gave me the best result. Also lowering the infill speed will make the infill more consistent.
Here is how to configure your Ultimaker (3) to print with Polymaker Polywood:
Select the 'Fine' profile with PLA selected, change the temperature from 200˚C to 190˚C, and change the infill speed (NOT the overall speed) from 70mm/sec to 50mm/sec.
For other qualities / layer heights, just lower the temperatures by 10˚C from the default temperature, and modify speeds so that none of the speeds exceed 50mm/sec and you should be fine. To further reduce under extrusion I've set the retraction distance to 2mm. This seems to give the best result, although the print requires some cleaning up afterwards.
The large header image above is the result of a 70mm tall Baby Groot figurine I downloaded from Thingiverse printed with Woodfill at these settings.
I must say that printing with Polywood is considerably easier than with Colorfabb Woodfill, but it still isn't as easy as with general PLA. There is still a fine balance between temperature, retraction and speed settings, and still you'll get some stringing.