The Bartender is the material trader guy of suit mats. An other post steam, says to trade up tp max quantity of graphene, microelectrodes, and weapon components.Yep, got one thanks to @Codger
I was a bit dispirited at the amount of materials needed by the Odyssey engineers (they are not exactly prolific in their availability either) so I went mining. Noted a couple of small changes: firstly, my lasers have turned into very fine beams on some colours; secondly, the sound has been tweaked a little - I can now hear a "crucnh" each time a fragment breaks loose from the 'roid.
Once I've mined a few hundred tons, I'll get back to some on-foot missions I think. Or exo exploration. I don't know why that appeals to me so much, but it does
Then trade back down as you want to engineer stuff..
Currently nearly opened engineers on both accounts. Taxi travel is easy. Combat in low missions is also not the difficult. you just die a few times less.