This machine will continuously craft the highest tier possible of any item you choose, and will recycle anything not good enough into better ingredients and reuse them. The benefit is you only need 1 assembly machine and 1 recycler, which saves on quality modules. You can tweak the qualities you don't want in the filter of the inserter going into the recycler.
How it works: You set an item as the signal of the constant combinator, and it will select all 5 tiers of that item and set the recipe for 5 dummy assembly machines, looking at the ingredients of each. It requests all ingredients into a buffer chest. It then keeps checking which ingredients are available on the logistic network, and will select the highest tier possible it can craft at that moment to set the recipe of the real assembler. It extends that signal for a little bit so it doesn't immediately switch back.
I'm using legendary quality modules, an epic assembler and rare inserters. You can change the quality of the entities as needed.