I was also researching the same sort of thing but in the format of an SD card. My 3D printer is supposed to run with a serial (USB) link, but I can't get the port driver working. I have to load up the .x3g file on an SD card to run the print. It would be an advantage to load the file using WiFi. They are available, but around £30 even from China. a micro SD wireless adapter at £15 seems a better solution for me (I'm only a poor old pensioner guv!).

Cheers,

Rob