Spiral Chess Set with magnet room

Chess with small room in the bottom for round super strong magnet 20x2mm (http://www.dx.com/p/10305). Pause the print in height 2.60mm and place the magnet inside. Then resume the print and slow down speed by 50% for nice result.

PET-G (Plasty Mladec PM), 0.2mm, 15% infill, 240°C hotend, 75°C bed.

Perfect bed calibration needed to have smooth surface. Use extruder fan.