This company has a 4 axis "hat" board for the Raspberry Pi. It uses Pololu style stepper drivers or you can get jumper boards for those sockets to use it with external drivers. The ebay listing for the external driver jumper boards shows how to use pieces of wire in the sockets if you don't feel like spending another $5 for a set of the four jumper boards. http://stores.ebay.com/Protoneer
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