A fully FDM-printed mechanical calculator performs addition and multiplication by setting digits and turning a hand crank. It uses no electronics; rotations through printed gears perform the calculation, including a mechanical carry mechanism.

3D All Workshop spent about two months developing the design. Because FDM-printed gears are sensitive to tolerances, the mechanism went through roughly one hundred design iterations before it worked reliably.

OVODYO displays time by rotating two numbered 12-sided solids until the appropriate faces point upward. One indicates the hour and the other advances in five-minute intervals, with internal gearing rotating each shell around two axes.

Creator ekaggrat singh kalsi built the clock. Because the minute solid only changes every five minutes, LEDs indicate the exact minute between those steps.