I hear you on the filament cost and for anything I am unconcerned about (i.e. test print, print that is not itself visible or structurally important, things like that) ... I use the cheap stuff. I only use the Taulman or ColorFabb when it matters. When it does matter those are two sources I rely on. Generally speaking the R1 series can eat just about anything and make it look decent. My delta printers and the C2 are more picky.