Customized version of http://www.thingiverse.com/thing:973198

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=973198

Using the following options:

Surrounding_Traps_Upper_Holes_Diameter = 27
Number_Of_Surrounding_Traps = 8
Cap_Wall_Height = 16
Center_Trap_Height = 60
Surrounding_Traps_Lower_Holes_Angle = 2
Center_Trap_Lower_Hole_Angle = 0
Surrounding_Traps_Height = 40
Cap_Ceiling_Thickness = 0.7
Center_Trap_Lower_Hole_Diameter = 6
Cap_Inner_Diameter = 80
Center_Trap_Upper_Hole_Diameter = 35
Wall_Thickness = 0.5
Surrounding_Traps_Lower_Holes_Diameter = 3
Surrounding_Traps_Lower_Holes_Orientation = 50
Will_There_Be_Center_Trap = Yes