This is a handle that fits on the end of the filament tool that came with my machine and makes it more comfortable to use. Its primarily use is to clear the filament path from the extruder down to the nozzle (on a direct drive system). It may have other functions, but this is the only thing I've ever used it for.
The specific filament tool for this handle can be found at: https://everybody3dprints.com/product/alignment-tool/
It's very possible that it can be used with a variety of different machines that use 1.75mm filament, but works best for direct drive hot ends.
It's an easy print that is in two pieces. It requires two M3 x 6mm bolts with nuts and can be printed with the filament and settings of your choice.