By Default the current firmware for the Kossel and Prusa I3 are setup for the 2004 LCD, to run the 12864 LCD you will need to locate 3rd party firmware that is readily available across the RepRap community.
The build guide can be found on the following google drive link, in addition you will also find the firmware, and the configuration guide:
Folger Technologies - Google Drive (Prusa i3) Documentation
Please follow the tuning guide found here:
Folger Technologies - Stepper Tuning Guide
Care must be taken well tuning the stepper, over driving the current can cause damage to the stepper driver chip. Please also note, putting your stepper drivers in backwards will most likely permanently short out your stepper driver.
As of revision B and higher our kit these bearing holders are no longer required, please note in the guide that the LM8UU bearings now attach directly to the acrylic y-carriage using the provided zip ties.
With the current kit design we prefer to put the endstop on the small bit of 8mm rod that extends past the 8mm nut on the rear lower right of the print bed platform. Putting the endstop here will allow it to hit the heated bed and give you the print area you desire.
You may have reversed your motor connector on the RAMPS side, flipping the connector around should cure this problem.
50 microns (0.05mm)
All of our kits and printers are capable of printing ABS, PLA, Wood, PVA, TPE
Depends on the filament you are using, normally 220-235c
Depends on the filament you are using, normally 195-220c