Duplo OV Scanner

thingiverse

My kids are absolutely thrilled about building with Duplo blocks, and just recently we took a fantastic trip using public transportation - we rode buses and trains, where we had to swipe our cards to get on board. After returning home, my little ones started constructing a train station out of their beloved Duplo bricks, but they quickly realized that one crucial feature was missing: a card scanner! And then it hit them - an idea so brilliant that it's almost too cool for words: building a miniature card reader to fit perfectly onto their Duplo creations.