Marble run toy blocks
Buy plans for the marble blocks
From time to time, people ask if they can buy the blocks. Sorry, I do not make these for sale.
Recently (March 2019) I received an email from a guy in the czech republic who hand-makes
blocks based on these for sale here: drevodilnakulicka.cz.
Also, if you want a toy in similar spirit, you can search fur "Cuboro blocks", or "Haba kugelbahn".