3d Print Cost Calculator

Very basic Java program I made a while back to calculate the cost of a print given the cost and weight of a spool.
Doesn't require install (if you have Java) and should work across systems.

Update: Android app is out!
https://play.google.com/store/apps/details?id=com.nz.ian.PrintCostCalculator
or
https://play.google.com/store/apps/details?id=com.nz.ian.PrintCostCalculatorPaid if you don't want ads.

Input:
Filament Type (PLA, ABS)
Weight of Spool (kg)
Cost of Spool ($)
Len