Tooth-tipped handle wrench (34 mm inner diameter). You should be able to modify it by scaling it in Bambu Studio and measuring only the inner diameter. You can also make it thinner on the Z axis to save material, but it's already very small (21 grams with 50% infill)

I used 50% infill and printed with PETG, but I think you can use less material for lightweight tasks, and even PLA is sufficient for DIY and hobbyists. There's nothing fancy here, but maybe it can save others some trouble.