My coworker had an old rod holder he used for ice fishing. It snaps onto a 5gallon bucket and holds the rod. So I jumped into solidworks and modeled him up a 3d printable version, and printed him enough to last several more years.

Hope you can find it useful. I have included Fusion360 and Step files, as well as 3MF and STL in both the supported an unsupported version.

Update: Solidworks native design file included. The solidworks file has two “configurations” to turn on/off integrated supports.

Print instructions

Prints easily in any material (PLA, PETG, ABS). I have included a version with integrated supports and sacrificial diaphragm to support the horizontal latching tabs. But if you like your own supports there is a clean version for you to support how you see fit.