Here is a platform that you can station above a planet and it will acquire orbital resources for you. I find this useful for getting calcite on other planets or a trickle of iron and copper for Gleba. I reckon the sulphur will be useful for Volcanus but I haven't scaled up there yet. It can be done with common parts and without circuits, but it would be about twice as big and I had so many quality resources lying around that I figured why not use them? This station can only be built after doing basic builds on Volcanus (for foundries) and Gleba (for advanced crushing). I would recommend also having done some stuff on Fulgora as it makes for a great quality hub, but it is not strictly required.

If you want to build this in your game, here is the blueprint string: