This is an Eureka Puzzle called "Reason Out" of a **** difficulty. I got this back in November and decided to take it out again. I got it stuck in this position
OLIVER RING - WOODEN STRING PUZZLE / Eureka - Wooden Disentanglement Puzzle / Wit's End Puzzle by aarrodri | Download free STL model | Printables.com
Eureka the Tube Puzzle - toys & games - by owner - sale - craigslist
Free 3D file OLIVER RING - WOODEN STRING PUZZLE / Eureka - Wooden Disentanglement Puzzle / Wit's End Puzzle・3D printable object to download・Cults
Eureka 3D 473359 3D Puzzles : Amazon.com.au: Toys & Games
Amazon.com: Eureka Puzzle Care Package : Toys & Games