Chaperonins assist protein folding and exist as multi-subunit protein assemblies. The most know chaperonin in  Escherichia coli is the GroEL / GroES complex that is deposited in PDB as 1aon. I made this model for teaching protein folding and was designed in order to physically replicate to some degree Figure 4-30B from Lehninger Principles of Biochemistry, fifth edition. For the multicolor model, an IDEX printer is required.