This is the collar that holds the stop gauge on a Central Machinery (Harbor Freight) 8" drill press.
My original collar cracked and broke so I designed this new one which is a drop-in replacement but I designed it to be beefier. So far, it seems much stronger than the original.
I printed it with PETG at 50% infill and with 3 walls and it is very strong. I printed with supports to support the top of the recess for the hex bolt head but this may not be necessary.