Setting Up The Printer
After you have set up OctoPrint on the Raspberry Pi, connect the Ultimaker 2 Extended to the Raspberry Pi via USB.
Make sure the Discov3ry is connected to the Ultimaker 2 via the E1 port in the main board under the printer. The wires should be crimped into the connector for one of the Discov3ry paste extruders. If you wish to crimp the wires for the other paste extruder, you will need to order more connector housing and connector terminals for the wires.
In order to get the Ultimaker 2 Extended and Discov3ry paste extruder ready to print, the tube from the Discov3ry to the nozzle must be primed. This means that the Discov3ry must take time to push edible material all the way through to the nozzle. This is done by printing with modified CAD models repeatedly until the material is pushed through the tube and there is a consistent flow rate out of the nozzle. There is a modified gcode file called primer.gcode that runs for about 15 minutes - similar to the amount of time it takes to prime the tube with material. You can also run any gcode file from the models folder for cake frosting multiple times to achieve the same effect.
NOTE: If you are using the same material and just refilling the syringe, you do not need to replace the nozzle or tubing. You can simply just replace the syringe and re-prime the tube with the new syringe of material.
We designed and printed with Betty Crocker Cake Icing. This means that the gcode files and configurations are set for a cake icing viscosity. For switching to different materials, you will need to generate the CAD models with a different slicing configuration (our configuration is here).
Discov3ry Setup (If only they had this video when we started!)