T4 phage with 5 parts printed separately: capsid, base plate + sheath,  collar, spike, and tail fibers.

The sheath fits through the collar and into the capsid. The spike and 6 tail fibers fit into the base plate.

The capsid can be printed at 5% infill, everything else at 15%. Everything can be printed with no supports or bed adhesion, but if you scale it down you may want to add bed adhesion because of the lower surface area.

Update: added a second version of the tail fibers that are more tucked in so the base of the model isn't so wide.