This simple tool allows you to estimate the cost of a 3D print (for a potential customer). It takes into consideration these parameters:
-cost of electricity (in Euro and US country)
-cost of material (you can also specify the price/kg of your spool, or you can use default values)
-print file preparation (this cost is added for each print, so if you have a lot of object but all equals, insert value 1 (only one print is considered))
-short post production (like supports removal)
-machine wear

This app compute an estimation, so take the results as an example only. You can contact me for problems or help.