Can the da Vinci Jr 1.0 print in 100 microns, if so how?
I will attempt to answer your question, as it stands. 

Dealing with the first part, according to the product specifications, the resolution, or layer thickness, is indeed 100 &mu;m, when printing using the Fine setting.


  Resolution
  
  Fine 0.1 mm (100 microns)
  
  Standard 0.2 mm (200 microns)
  
  Speed 0.3 mm (300 microns)
  
  Ultra Fast 0.4 mm (400 microns)


With respect to the second part of your question, how could I do this? You simply put the printer into Fine mode, and the resulting print will be printed with 100 &mu;m thick layers.

If this is not what you wanted to ask, then please clarify your question.