The author remixed this model.
Fixed the existing model. It was showing errors in the slicer and trying to bridge where it shouldn't.
Uploaded into CAD, redrawn the entire model using its outline.
Mind that the spacing in the 4 most left extrusion is slightly different. I just took the lazy route and merely used a linear pattern instead of placing them like the original.
Other than that it is a one to one copy.
I don't take any responsibility for other issues with sizing.