This is the baggatelle that you may of seen at TCT at the NEC   UK in October 2015. It is a three quarter replica of the one that I used to

play with in the 1960's, made by Chad Valley. The printed version is 26 inches long.

It was printed on a bed size of 340mm  x 280mm

See the photo for description and instructions.  The drill should read 2.3 mm for pins   NOT  3mm