Here is an attachment made from plywood that can hold a pencil for Delta configuration machines. it can turn them into simple plotters enhancing your tool options. 
Video of plotter attachment in action connected to RDelta 3d printer:
All the files and instructions can be found at:
http://www.thingiverse.com/thing:2120341
Video of plotter attachment in action connected to RDelta 3d printer:
All the files and instructions can be found at:
http://www.thingiverse.com/thing:2120341
