This model is a correction to the original 5 cylinder radial engine model I built before. I realized after publishing the previous version that 4 stroke radial engines To assemble, print the following parts, and follow the assembly procedure.Cylinder BlockHandle *Rotor *Pin *Hub Bottom (Requires support)Hub TopPiston (x 7ea) *Rod (x 6ea) *(Parts with an asterisk are identical to the 8 cylinder version. Note that you need 1 less of piston and rod.)The un-sectioned cylinder block is also uploaded, but I have not tried printing it (I am not entirely sure if it the parts can be assembled into it).