Prototype Gel Molding Box

This is an agarose gel mold box for different sized gels. It is a prototype. I would like it to tighten at any point but the screw does not hold enough force. I made another prototype with a wedge compression system, but this only works for the two boxes designed for the mold. After the print is complete, I applied silicone to the face of the clamps with a puddy knife. Apply it as uniform as possible. This give it a seal so the liquid does not leak out.