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A few more USB ports would be a welcome addition, as now the keyboard and mouse take those two on board...
For me, a board only solution makes sense only if it is a standard form factor, for example mini-itx, so a machine could be built with only off the shelf parts. But for most situations, the current case is perfect, as there are no user servicable parts inside, except the boot switches and micro-sd.
A board-only solution for robotics only needs to have easily obtainable screw mount dimensions so it can be bolted to a design :)
Mini-ITX is rather large for the purpose, and defeats the object of using a system like the Efika MX (after all why not use Atom, there are plenty of ITX Atom boards around if you want an ITX robot).
ARM processors have higher integration and smaller profiles, which means smaller robots. The smaller the control board, the more compact the robot :)
In terms of a board-only solution unless there is significant I/O capability which would be covered by the case (on the Efika MX, there is absolutely not..) then it is not worth having two different models. We realized this pretty quickly with the current Efika MX model.
What the Efika MX needs for robotics is an easier way to mount the case onto a robot - perhaps a case which can be mounted to a VESA mount (in a very small design, 100mm by 100mm may be far bigger than the system though!) on the back of a monitor can be used to mount onto a robot too. This would offer a standardized mounting for all solutions.