I built a 3DR Simple without a Printrbot Simple because I could print all of the parts on my Buccaneer. The printer I built is pretty tall, with a maximum build height of around 43cm: (I've since moved the extruder closer to the center of the printer to reduce the length of the Bowden tube, and made other changes which you can see in some of the pictures below) I ended up going with an E3D hoby darco - Delta Machines