Summary I printed this to use in building the Digital Sundial, http://www.thingiverse.com/thing:1068443 Customized version of http://www.thingiverse.com/thing:193647 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=193647 Print Settings Printer Brand: PrintrbotPrinter: Printrbot PlusRafts: NoSupports: NoResolution: .2mmInfill: 100% Notes: Use a brim, the point of contact with the bed is minimal. I used 8 lines. The included nut will fit the bolt. Instructions Using the following options: nut_diameter = 12 facets = 6 thickness = 2 drive_diameter = 5 nut_type = normal head_height = 5 head_diameter = 10 nut_step_shape_degrees = 45 thread_step = 2 nut_resolution = 0.5 drive_type = phillips resolution = 0.5 slot_depth = 2 nut_height = 6 non_thread_length = 35 wing_ratio = 1 thread_outer_diameter = 6 inner_diameter = 8 nut_thread_step = 2 texture = exclude slot_width = 1 step_shape_degrees = 45 head_type = button countersink = 2 type = bolt thread_length = 15 nut_thread_outer_diameter = 9 outer_diameter = 14 non_thread_diameter = 0