This is my 3D printable version of the Wobble Chess set:

http://www.uncommongoods.com/product/wobble-chess-set

Print and fill the hollow bottom with sand, mortar, or anything very dense. Glue the top on the bottom once dry.

The heavy bottom will keep the chess piece upright.

This set is made with TinkerCAD. Edit each piece at:

King: https://tinkercad.com/things/dXJvHZRfMzC Queen: https://tinkercad.com/things/4mnrOL24YHi Bishop: https://tinkercad.com/things/1Dud6Vbo96M Knight: https://tinkercad.com/things/09Ei2jn9xht Rook: https://tinkercad.com/things/1fu3Cs9yiTA Pawn: https://tinkercad.com/things/2bz4hCXxa0b