Tower of Pi
Hard to print? Probably... But definitely worth every digit!
If you have a FDM printer, try the one with the solid walls first.
My third contribution to pi day March 14 (03.14).
This is a part of a series of towers/penholders made out of digits.
Tower of Pi: http://www.thingiverse.com/thing:271769
Tower of Tau: http://www.thingiverse.com/thing:295304
Tower of Euler: http://www.thingiverse.com/thing:783098
Tower of Phi: http://www.thingiverse.com/thing:788653
Pi - Penholder: http://www.thingiverse.com/thing:271353
Please have a look at some of my other things: