What clearance should I leave between parts that are supposed to fit together perfectly when using a .6mm diameter nozzle?
First, find or make a tolerance checking test print. This basically just involves a few cylinders with diameters something like 0.1, 0.15, 0.2, 0.25, 0.3, ... mm smaller than a cylindrical hole, and lets you figure out what works without going through lots of iterations on your actual part design or time on the printer. Make note that diameter (2 gaps) vs radius/gap-width (single gap) is a really important distinction here.

With that said, your design does not look well-suited to 3D printing. The purple studs are going to break. That's pretty much a given. And overall there are just way too many pieces. A big part of the advantage of 3D printing is that you don't have to assemble things out of parts that would be easy to produce (or available stock) with traditional manufacturing methods. You can often produce a complete working result all in one print, or two or three if there really need to be separable parts.

I would replace the purple studs and red piece that looks like it's intended to allow easy connection/removal with a threaded interface. That would distribute the forces much more evenly, and it's easier to print. If you don't care what orientation it stops at, it's super easy; otherwise you have to put some sort of stop or predict where the friction will hold it.