I've Remixed "Subaru WRX Washer Cap" to add different text for the 2 reservoirs on my '95 STI. I did not make the "STI" logo, it was taken from http://www.thingiverse.com/thing:1330474.
The text has gaps between the walls for me in Cura but I just bridged that with paint.
Monoprice Maker Select V2
Rotate each .stl so that the text faces up and the supports are on the bottom of the cap.