BasWheel 
LEGO Technic axle compatibility tested out ok by Gareth Chiprobot (http://letsmakerobots.com/user/2941, http://www.thingiverse.com/Chiprobot).
Ideas from http://www.thingiverse.com/thing:21486, http://www.thingiverse.com/thing:17514 and http://www.thingiverse.com/thing:5713
The servohead cutout is based on http://www.thingiverse.com/thing:28566
The OpenSCAD Parts Library (http://www.thingiverse.com/thing:6021) is needed. (not included)
The Lego axle size 2 (http://www.thingiverse.com/thing:66884) is needed. (not included)
The Parametric servo arms (http://www.thingiverse.com/thing:28566) is not needed. (code parts included)
v 2.02, 29 Jan 2015 : Added spoke_type "segmented" and parameter spoke_angle. Fixed a bug with rim_type "barrel"
v 2.01, 14 Jan 2015 : Added spoke_type "Hankook_NPT"
v 2.00, 9 Jan 2015 : Added tire_compatibility "rc1_10", added parameter rim_dxf, changed parameter names from dxf_filename to spoke_dxf and from spring_segments to spoke_segments, added spoke_type "Polaris_TerrainArmor"
v 1.28, 28 Jul 2014 : Added parameter rim_type
v 1.27, 18 Jun 2014 : Added parameters hex_screw_spacer, hex_screw_OD, hex_screw_ID, hex_screwhole_depth, hub_magnet_count, hub_magnet_margin, hub_magnet_diameter and hub_magnet_height
v 1.26, 4 Jun 2014 : Added hub_type "hex" and parameter hex_size
v 1.25, 14 Mar 2014 : Added spoke_type "dxf" and parameter dxf_filename
v 1.24, 25 Feb 2014 : Added parameters tire_compatibility and flip_wheel
v 1.23, 14 Jan 2014 : Fixed bug with parameter outer_thickness
v 1.22, 3 Jan 2014 : Added parameter wheel_extra_height
v 1.21, 2 Jan 2014 : Added parameters servo_hole_ID and servo_hole_OD
v 1.20, 24 Dec 2013 : Added hub_type "legoturntable"
v 1.19, 29 Nov 2013 : Changed license from CC BY-NC-SA 3.0 to CC BY-NC-SA 4.0 and added comments to parameters
v 1.18, 26 Nov 2013 : Removed parameter slot_height
v 1.17, 20 Nov 2013 : Changed license from CC BY-SA 3.0 to CC BY-NC-SA 3.0 and added hub_type "hubattachment"
v 1.16, 18 Nov 2013 : Added hub_type "stepper" (built to match stepper type 28BYJ-48)
v 1.15, 18 Sep 2013 : Added hub_type "servohead"
v 1.14, 23 July 2013 : Added magnet_diameter (used if you need holes for neodymium magnets on the servo_hub) and magnet_offset parameters
v 1.13, 18 July 2013 : Added hub_type "no" used for push-fit axles
v 1.12, 18 July 2013 : Added spoke_type "spring", spring_segments variable, changed "double_left" to "spiral_left_double", "double_right" to "spiral_right_double", "left" to "spiral_left" and "right" to "spiral_right"
v 1.11, 19 June 2013 : Added small spacing between double spokes
v 1.10, 18 June 2013 : Fixed hub high for the screw to be able to be bolted
v 1.09, 6 June 2013: Added hub_type "lego" and added all the variables on top of the file (Customizer ready - not working yet due to imported libraries and external stl file)
v 1.08, 5 June 2013: Added support from spoke to wheel
v 1.07, 31 May 2013: Fix servo hub (added a small distance between the main hub and the servo hub)
v 1.06, 29 May 2013: Added servo hub
v 1.05, 27 May 2013: $fn deleted from file and included in function call
v 1.04, 24 May 2013: Added spoke_type "double_right", changed "both" to "double_left"
v 1.03, 23 May 2013: Added parameter Screw_size and calculation of hub based on it
v 1.02, 22 May 2013: Screw shaft
v 1.01, 21 May 2013: Rim added
v 1.00, 20 May 2013: Initial release