This tool holder is designed for the iGauging machinist square set, but probably works for any similar sets from other manufacturers:
https://www.rockler.com/igaging-3-piece-engineers-square-set
Should you have a different set, an Inventor file is provided and the parameters can be changed to adjust the size of the tool holder.
A zip file is included with the preconfigured XML parameter files for the iGauging set if you just want to tweak them a bit.
No supports needed. Print at .16 layer height and oriented with the shelf on the build plate:
The author hasn't provided the model origin yet.