This is a bracket for K-Guard gutters (I think an older design, mine were installed around 2002). You can see the original (with part of it snapped off) next to my print of this bracket. This is a remix of https://www.thingiverse.com/thing:6067353 but designed to be printed on its side without any overhangs.

This is probably over-engineered, but I had no problems at all getting 3 of them into my gutter that had pulled away from the house.