A:
 sphere_diameter: 10.2;
 knob_diameter=4.9;              //knobs on top of blocks
knob_height=1.6;
knob_spacing=8.0;
wall_thickness=1.45;
roof_thickness=1.05;
block_height=9.5;
pin_diameter=3;         //pin for bottom blocks with width or length of 1
post_diameter=6.4;
reinforcing_width=1.5;
axle_spline_width=2.0;
axle_diameter=5;
cylinder_precision=0.5;