I'm not sure what exactly what I want to trade it for, but I'm thinking some solid shade of green (T1/Toxic, Machine Green, or another darker green), one of the purples, or maybe something else. Mint Gum would be awesome for Hyperfuse, but I'd rather trade the Gummyrot for a less common color or one that matches my current sets or one of my typewriter sets. I love the cap, but I don't really have anything it goes with right now. Looking for MX only. I haven't yet converted to the cult of Topre and, sadly, there really aren't any Alps.
MX Gummyrot Skull
On the Brobot front, THC or Toxic followed by Army Man Green are probably the few I'd like the most. I love the caps I have, but I hate hoarding colors that don't go with my color scheme.
Jellybean Red Topre
Jellybean Blue MX
All of these colors are awesome, but, like I said, I feel bad holding onto something that I'm not using because it doesn't go with anything I have. Jellybean Blue almost goes with my Tai Hao blue caps, but I don't like them together. Call me a heretic, but I prefer solids to translucents.
So make offers in different colors. The worst that can happen is that I'll say no.
And I'll probably be including some cap of my own that I've cast with any trade. I've done that with most my cap trades in the past and some of my other sales and trades in the past.