My Seastream Angler 120 didn't come with a cup holder so I designed this one and should fit any of the feelfree kayaks that use the unitrack. It is designed to use a tapered 10-32 screw and hex nut. The nut will need to be glued into the track adapter to keep it in place for installation. It might work for Yakattack tracks as well but will sit higher because of the bump designed to fit into feelfree's unitrack and you will have to figure out how to mount it to the track.

I'm currently printing this for the first time and it may need revisions. 8/30/2020

I realized the first version I made wouldn't fit a 32oz stainless insulated cup so I made it a little wider and a little shorter. I took a version of this on a float trip and it worked really well but I realized it needed some drains so I added a bunch. I also broke up the cup holder to make it easier to print and will need to be glued together. I'll probably add a Scotty adapter in the near future. 9/7/2020

I added a Scotty mount adapter that bolts to the flat bottom cup holder with a 10-32 nut and tapered bolt.
I also gave the option to print the cup holder as one piece or two.
The cup holder labeled Scotty Cup could be used on other track systems like the Yak Attack tracks but you'll have to come up with the nuts that fit the track. 9/12/2020

Fixed nut size on scotty adapter. 9/14/2020

Added divots for the scotty adapter to seat in on the cup holder so it doesn't spin when you bolt it together. I also changed the bolt hole from the side to sliding all the way through the bottom. Choose the V2 model if you want that option. 9/14/2020