calculate basic extrusion rate as factored by the cross section area of the filament and that of the print extrusion.
(pi * (filament diameter/2)sq / (extrusion width * layer height)) * extrusion multiplier

Inputs

Name	ID	Description	Type
Layer Height	LH	Layer Height or a Xylinus Filimant Config	Goo
Extrusion Width	EW	Extrusion Width or a Xylinus Filimant Config	Goo
Filament Diameter	FD	Layer Height or a Xylinus Filimant Config	Goo
Extrusion Mutiplier	EM	Extrusion Mulitplier or a Xylinus Filimant Config	Goo

Outputs

Name	ID	Description	Type
extrusion rate (E mm / 1 mm travel)	ER	Expression result	Goo