GrabCAD
A modified version of Pedro Navarro's "ATX Power Supply / Fonte de Alimentação (v1.0)." I had to nearly recreate the whole model to get something sane in Fusion 360. I added additional vents and a decal to approximate a Power Man 350W supply, model IP-S350CQ2-0. It's a good approximating, but it isn't intended to be exact.
Direct link to the original creator's page
Click the "View on GrabCAD" button above to visit the original model page on GrabCAD. You can download the FUSION 360, RENDERING, STEP / IGES file directly from the creator's page for free.
This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, this model is available as a free download on GrabCAD. Some creators accept tips or donations.
Check the license (see original page) on the original GrabCAD page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.