Rimfactory Synthamide Composite
When you have both Rimefeller and Rimfactory, it gets kinda annoying that you can automate plasteel, but not synthamide composite. To make matters worse, autoclaves are really annoying to use, and don't use the vanilla bills system, so composite can't even be automated using adaptive assemblers. So, I decided to fix that. The same metal refinery that makes plasteel can also make synthamide composite.
Since Rimfactory's plasteel recipe does not require synthylene, I'm going to say it's capable of filling whatever function the synthylene would otherwise be required for. Thus, the synthamide composite recipe will also not require synthylene, only synthamide and chemfuel.