Do Science To It
Rare8.0%ObjectiveOptionalAnywhere
Synthesize a component with the Chemistry Lab.
Build the Chemistry Lab (1,600 bytes; Ceramic + Tungsten + Glass at the Medium Printer - the Tungsten means a Desolo or Calidor trip for Wolframite), then synthesise anything. Rubber is the freebie: 1 Organic + 1 Resin, both lying around any Sylva base. Pops on your first synth.
You'll be back here a lot for Lab Rat, so park the lab somewhere with decent power.