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Summary First improvement to my custom 3D printer. 3D printed Potentiometer pot knob made by me in 123D designs and printed with Cura. This was my first 3D designed object for 3D printing. The inner hole was printing smaller than designed, so I had to add 0.3mm to the inner hole dia for it to print 6mm as I wanted. Print Settings Printer: My custom 3D printer Rafts: Yes Supports: No Resolution: 0.2 Infill: 25% Notes: Print settings Brim: 20 lines Shell thickness 0.5mm Fill bottom top 0.5mm Print speed 30mm/s Temp ex 245C Temp bed 100C Filament dia 3mm Flow 125% Nozzle 0.5mm Knob size in 123D design: Outer dia knob: 20mm Knob hight: 10mm Hole inner dia: 6.3mm Knob size printed: Outer dia knob: 20mm Knob hight: 10mm Hole inner dia: 6mm