Density of GEL-LAY and LAYWOO 3D print material?
I can't provide the end answer, but if you already have the material, you should be able to measure this yourself quite simply.

Measure and cut a sample of filament, and weigh it. For example, a 10 meter length with a 1.75 mm diameter will have a volume of:


  v = pi * r2 * l
  
  v = pi * (0.175 cm/2)2 * 1000 cm
  
  v = 24.05 cm3


Density is mass divided by volume. If your sample weighs 18 g, this would be


  d = m / v
  
  d = 18.0 g / 24.05 cm3
  
  d = 0.748 g/cm3


Note that the accuracy of this measurement will depend on the accuracy and precision of your measurements. A household kitchen scale might not be good enough for such small weights. In order to get a good weight measurement, you may need to use a much longer (and heavier) sample of filament.