Burrly Possible by Wayne Daniel

I received this 12 piece burr disassembled and getting it together seemed like a Herculean task.  I enlisted the help of long time puzzle designer Derek Bosch to sketch up a burrtools file and it turns out he had the original printed solution as well, thanks Derek!

This puzzle was exchanged by Abel Garcia at IPP16 Luxembourg (1996) and came with this description:

“A holey 12-piece (4x4x4) burr, assembling in a checkerboard pattern.”

John Rausch describes this puzzle at PuzzleWorld:

“This twelve-piece burr has unusual internal construction to make an otherwise impossible puzzle.”