Hello, I wish to give a try to Astroprint with a Raspberry, connected to my Smoothieboard. In the past I had bad experiences with direct control of printer via USB<->PC<->Pronterface, especially with small and frequent movements. Actually I print always from Smoothieboard SD card. Printing directly from Raspberry (via USB or, better, via TTL serial) is smooth enough in your opinion ?
Give it a try. I haven’t personally tried AstroBox with Smoothieboard but on Marlin, Sailfish printer it works pretty well.