I use an old Printrbot Simple October 2013, all wood, spit and string, but works great! There was no choice under what printer i use for that so i chose the closest thing. This year (2017) I also bought a Geeetech Rostock 301 3 color mixing printer, customized the extruders and replaced defective diamond knock off hotend. It works well, but i am still trying to hack it to provide gcode driven mixing.
I Am A…Engineer, Designer
Tools I Use…
Printers: Geeetech Rostock 301
Design Programs: I write my own c++ applications to generate stl
3D Design Skill Level