You can now add the ReprapWorld electronics boards directly into Arduino. Currently we support Megatronics, Ultratronics and the Anet A6 boards. You can find the instructions here.
ReprapWorld is the number one webshop for all your reprap supplies for your 3D printer. We have a large collection of 3D printer components, from our famous electronics lines to filament from our own production. And everything is at a very competitive price!