Step 1: CAD -- Design a 3D model using any kind of CAD software (OpenSCAD, Tinkercad, OnShape, etc.). Make sure to think about constraints of printer during design process - 45% angles, vertical alignment.
Step 2: Convert to STL -- Export your CAD, 3D model to STL format. Make sure units are correct when exporting files. Keep track of your newly created STL files by naming them similar to your CAD files.
Step 3: Upload to Cura -- Import your STL files (patiently) to Cura, by clicking the upper-left hand button within Cura when you first open the application. Examine the design to see if it looks similar to the CAD model. Make sure the correct model of Ultimaker is selected. Put the nozzle size to 0.6mm. Add brims, skirts, supports, or any other potential additions to the design. Export as .gcode to microSD, name it something you will remember, and eject microSD card.
Step 4: Machine Setup -- Apply adhesives to the base plate of the printer if needed. Make sure the right color polymer is in use. Make sure no plastic is going to get caught while printing. Plug the microSD card (or USB if using dual extrusion) into the printer. Use the dial to select your print, press start print, and let heat up. Watch it start to print and make sure everything looks satisfactory.
Step 5: Build -- Let the machine do its thing. Continually glance over at the printer to see it isn't air printing and/or stringing. Make sure it is printing at a slow enough speed so that it is attached to the base. If you want to speed up the process, increase speed only when it is about half way done.
Step 6: Removal -- Remove the printed object (or multiple objects) from the machine. Be sure to take any safety precautions to avoid injury such as wearing gloves to protect yourself from hot surfaces. Use pliers or other tools to help remove if needed.