Remixed Shawn_T_hingi's model of a similar part, to fit my Brother HL-3170CDW. Brother part number LY2204001 (in case it looks like it'll fit your printer, use that part number to see what other models it fits). As a change to the original part, I made some of the areas solid and added braces at the rear to help keep the arms from breaking off, since those seem to be a weak spot.
Printed as it sits in the paper tray, with tree supports for the raised sections on the bottom and the small tabs at the top of the arms. Used 100% infill.
The author remixed this model. Imported from Thingiverse.
Heavily modified to fit my HL-3170CDW