Toy anchor for toy boats. My nephews like my toy torpedoes, but they find it difficult to target my sailboats as they move under wind power. (Also... I didn't really design those sailboats as "targets" so much as you know, "sailboats"...) So I've made an anchor suitable for toy boats so they can anchor a target and have at it. Designed to give ~0.25mm clearance on a 1.75mm filament hinge (i.e. axle hole is 2mm dia). Print solid for weight.

Update

I tried it out, and it works OK, because it is so light, if the water is not quiescent, it'll deflect the anchor and let it land in a non-optimal fashion... So I made a heavier one. Axle is 1/8", I used a piece of steel rod I keep around.