Marble Binary Adding Machine - Mechanical Computer with Flip-Flops, Adds A + B, Educational STEM Toy

A working mechanical computer you print yourself: steel balls roll down a tilted board and add binary numbers. Five blue flip-flop rockers form a 5-bit accumulator (A = 0 to 31), four blue catch latches hold a 4-bit input number (B = 0 to 15), and orange flags show every bit. Slide the release one way and a ball counts +1; slide it the other way and the machine adds B into A, carries and all. Read the result in binary and convert it with the 0-31 lookup table printed on the board. White board,…

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