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I was going to order a replacement hanger clip from Troy-Bilt, since these things are easy to lose, and saw they were $2.24 each plus shipping. Hmm… doesn't look too complicated, I can make that in OpenSCAD… So I did. The fit is a bit looser than the original I had managed not to lose, but it snaps in much better - you can modify the SCAD file for a bit tighter fit (lower the variable id by maybe 0.25).

Print details (I use Cura, if you know other slicers, please add differences in comments or makes):
Flip upside down in slicer before trying to print - hook side down, opening pointing up…
PETG (I used eSUN Black PETG)
0.2mm layer height with 0.32mm first layer (I have an Ender 3 v2 with mag PEI - helps with first layer squish and bed adhesion)
0.6mm nozzle (shouldn't matter if you have a 0.4mm nozzle)
4 walls (for added strength)
5 top layers, 5 bottom layers (for added strength)
Tree support with 2 walls, touching buildplate, 80 degree support overhang angle (support is only really needed for the hook)

With these settings, and current (2024.01.12) Amazon US price for eSUN Black PETG, it came out to $0.22 per hanger clip.