i have a nwreprap prusa i3 (nwreprap.com)
originally i misread the instructions and installed the sprinter firmware and managed to get it printing fairly well. i picked up a discount reprap extra large lcd full graphics screen with controller, and was trying to get it working (still nothing but working with the guys at http://www.makergeeks.com/xtsm12lcdra1.html on that problem)

anyway on to the problem, sprinter was running a max height of 100mm for printing (found the setting to fix that) but i upgraded to marlin (https://nwreprap.com/downloads/marli...-i3-250000.zip) for the more integrated screen support hoping that it would help with the lcd screen. in the configuration.h file it shows the correct settings for build platform (200x200x200) but when i print my 20mm test cube it comes out reliably at 50%. before switching to the marlin firmware my only height problem was when it tried printing over 100mm. am i missing something with the marlin firmware?
specs
ramps 1.4 controller
software being used:
slic3r
pronterface

any help would be appreciated!
Mike