I have successfully used the  above info to set up a Printrbot Simple Metal. The following changes should be made however:  
Printer Settings: X max=170 y max= 270
 area width 230 D=165  H=250

In Slic3 Prnt Settings 
Configure --> Ext.Perimeter (tick the box)
Step 10 of above: Slic3r  --. Filament Settins --. Extruder First Layer 200
                                                                                     Other Layers 200
Slic3r: Printer Settings --> General  bed size x 170  y 270
Print Center 85  135
Custom GCode : replace start text with the following:
G28 X0 Y0
G29
Notes: After starting Repetier Host  connect printer with CONNECT button in top left-hand corner of screen. To save time pre-heat extruder by gong to MANUAL CONTROL and HEAT EXTRUDER --. Important - this only works after you have hit the small ON button on th DEBUG OPTIONS line. Then load load your stl file ; place it correctly on the bed, Slice and then print. 
The above instructions may seem obvious to many but for someone using Repetier Host for the first time and setting up a3D printer straight out of the box (as I did) the information may save some head scratching and/or frustration :-)