-Easy access to every connector -Breakable GPIO opening -Internal mounting holes (4x M2x10 or M2x14) -Micro SD card does not protrude but still accessible -Light guide -Compatible with Raspberry Pi 3, 2 and B+ Raspberry Pi 3, 2 and B+ version have enough power to run a wifi usb stick, 3d printer and logitech camera without another powered usb hub. Reduce the amount of wires around an OctoPrint setup.Printed with a Solid Utopia V2 at 0.150mm layer height, 100/120mm/s 2015-01-21 I uploaded a new version with more gap between the usb port and the pcb and more clearance under pcb. The fasteners pad have more strength too. Enjoy! Normand http://solidutopia.comPrinted with a Solid Utopia V2 -0.150mm layer height -100/120mm/s 4x M2x10 screw or M2x14