So In my general cheapness I was looking for a substitute for colorfab LW PLA. In my travels I found this. It is polylite LW PLA. Apparently it is already "foamed" and you can print using standard
PolyLight 1.0 - LIGHT GRAY - LW PLA – 3DLabPrint
In-house developed and produced Airplane grade LW PLA Filament., Suitable volume for our Hurricane, Zero, Bungee Prop, Piper J-3 CUB or any (1m) LW
PolyLight 330g - Army Green - LW PLA
PolyLight 1.0 - LIGHT GRAY - LW PLA – 3DLabPrint
Polylight LW PLA - A happy medium.
Polymaker PolyLite LW-PLA Black - 3DJake Polska
PolyLite LW-PLA (Light Weight, Low Density) - Matte Black - 1.75mm
PolyLite Light Weight PLA (LW-PLA)
Polymaker PolyLite LW-PLA Bright Yellow - 3DJake Polska
PolyLight 1.0 - SKY BLUE - LW PLA – 3DLabPrint
Polymaker PolyLite LW-PLA Black - 3DJake Polska