In general the main export products will be transported to my train station until the buffer is full. If the buffer is full, they will be processed further into other ingrediants with additional quality modules just to be disassembled afterwards, again with quality. By that I reduce the wastage.
Copper is simple - turn liquid copper into copper plates, and turn copper plates into copper wires in EMPs, exploiting the juicy 50% productivity bonus. In this case I send both to the train as both are practical ingrediants in many receipts.
For stone bricks I use quality modules in the initial liquid copper/iron production. The raw stone will be turned into bricks in electrical furnaces. Qualyity stone gets its own furnaces as otherwise it might block the whole process. The bricks are - if not sent to the train - turned into walls which are directly disassembled, as I have no actual need for quality walls.
Steel is simple, too - I turn liquid iron into steel, and steel which I don't send to the train into steel chests which are directly disassembled to get back the steel, hopefully in higher quality.
For iron plates and gears I have a longer chain. I create iron plates, and turn some of them into gears. The gears and iron plates are turned into yellow belts. The yellow belts and iron plates are turned into yellow underground belts. The yellow underground belts and gears are turned into red underground belts. Every time applied with quality, and for each belt production I get the 50% productivity bonus from the foundries on top. If I'd ship in lubricant I could even add an additional step and turn the red underground belts into blue ones, but I left that out.
In the end all those pretty useless quality belts are disassembled, and the remaining quality plates and gears are sent to the train.
For each product it will only stop the whole production if all buffers are full. Otherwise it will continue running. It works basically completely free of any circuitry. The only little circuitry I added is just is a constant combinator disabling the processing of rare respective epic ingrediants based on two values, as I've not yet researched the epic and legendary quality levels, and any attempt to upgrade those would be wasted.
Here's the blueprint of the most intersting part, the iron processing:
