Metrix Open Hardware Lab’s Brainwave RepRap Controller

[Luis E. Rodriguez]

What would the downside of this be? I'm not even sure if it supports an LCD screen and SD card?

MAKE

http://www.thingiverse.com/thing:25054

BUY

http://metrix.net/index.php?main_page=product_info&cPath=1&products_id=1

Luis E. Rodriguez

Are you a Maker?

[Bryan Boettcher]

It looks nice, although it's difficult to compete with reprapdiscount producing stupid-cheap RAMPS 1.4 boards.  There's a few design decisions I'm not a huge fan of, although it looks like a hobbyist could make it with commonly available materials.

For instance, I wonder why every single board has both a power and ground for the heated bed (and the hotend).  They could do the exact same thing with switched grounds, requiring the loads to be straight on the +V.  This would reduce the fusing requirements on the boards, and halve the power tracks (and probably increase the available power, as well!).  Boards like the Sanguinololu could use all 4 pins on the "power" outputs for ground.  RAMPS could use 3 of the 4 power busses on the Phoenix connectors as ground.  The hotend could run at a different voltage than the motors, which could run at a different voltage than the hotbed, which could be yet another voltage from the motors, all with the same hardware.   It's also likely the polyfuses would be completely obsolete as well.

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