Simple keyless handcuffs

These handcuffs are made to be as simple and easy to make as possible. It consists of 4 parts: Left cuff, middle cuff, right cuff, hinge pin. It was originally designed to be print in place but considering its rather bulky shape, splitting it up into several parts is cheaper incase any part breaks.

To make sure the cuffs fit perfectly, you need to measure your wrists and scale the model properly. It's best to use a calliper and measure both the long and short diameter of both wrists. The cuffs are designed to fit wrists with the diameter of 65 mm and 45 mm. If your wrists are 60x40 then scale the model by multiplying the relevant distance by 40/45 (0,88) or 60/65 (0,92). It's best to test it first with the test rings. Also, if your wrists are considerably smaller than 65x45, then you might have to test the locking mechanism with the lock test model.

There are two ways to unlock the cuffs:

If there are no hands in the cuffs, then they can be opened by pushing the right cuff up and t