Briggs & Stratton Oil Filter Wrench
thingiverse
The oil filter on my Briggs and Stratton lawn tractor has such a tight clearance around it that the models I found on Thingiverse would not fit around it. I tried replicating one of them using a mount for a 1/4" ratchet, but it just rounded the square hole when I turned. This second design is made to be used with an adjustable wrench and provides a large enough square to grab onto that it let me get the filter off the tractor. You'll want to print with the large opening up and use scaffolding for the bottom. I printed with 1.5mm thick walls and 40% fill and it worked in my case.
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