Pulley Sheaves
Hand crank winch hub
The sheaves (aka pulley wheels) that came with the pulleys I got for my hanging desk system were to small and bent the cable too much, so I printed these larger sheaves. They are made out of PLA and seem to be very strong.
I designed this in Blender and 3D printed it to make a winch to hold my hanging desk. It has four keyhole slots in it to connect cables to.