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Chri
i know that the Atmel is not so fast compaired to a 32 bit arm, but when i look to my Sanguino i can print with 400mm/s from SD-Card including a Panelolu2 so its still fast enough for the job, and most people are printing below 200mm/s , so i think the Atmel still has a lot of resources left and there are also no single board solutions that are small and inexpensive afaik.
It depends on how you define small and inexpensive. The Duet board measures 100 x 123mm. It costs about the same as the Printrboard and has much the same features, plus the advantages of a 32-bit ARM-core processor and on-board Ethernet. Once you have used a web interface to control your printer, you will never want to go back to USB.