Untested yet, as my printer's hot end won't heat up. (time to dissect, I guess!)

Print two of the handle half-pieces.

Original CAD file if you want to modify it in OnShape
https://cad.onshape.com/documents/f479a53c25e7f8a3f9ff0f64/w/85ca739eb38d8a6415d79600/e/077902a28cb0ed59ff4624b0?renderMode=0&uiState=6628764cc7a51f74e082acdf