Renewed version (scaled down and cut) of the geodethic domekit by EFFALO http://www.thingiverse.com/thing:3215

http://desertdomes.com/dome2calc.html
to make a dome, you'll need 26 connectors (20 hexagons and 6 pentagons) and 65 struts (35 of length A and 30 of length B).
to make a sphere, you'll need only six more pentagons (for a total of 32 connectors) and 60 each of strut lengths A and B.
this design uses 10mm holes that fit 3/8" hardwood dowels quite nicely, but feel free to adjust the script to your liking. to determine your strut lengths, use a calculator:
desertdomes.com/dome2calc.html
simplydifferently.org/Geodesic_Dome_Notes?page=3#2V/L2
and refer to this diagram for assembly:
desertdomes.com/graphics/dome/2vdiagram.gif
A 11.3 mm 35x
B 10 mm 30x
SPHERE
A 60
B 60
5way 12x
6way 20x
SEMI
A 35x
B 30x
4way 10x
5way 6x
6way 10x