Printrbot has announced that they are rewriting their firmware. Significant changes to Marlin are being made in order to simplify and improve things for Printrbot users. The new code, which has yet to be released, will be open source with plenty of room for coders to play around, but Printrbot emphasizes that their changes are "laser focused" on improving their own hardware and software. The changes are also part of a larger transition away from desktop to cloud-based software. Read more at 3DPrint.com: http://3dprint.com/112025/printrbot-marlin-firmware/