The author remixed this model.
i printed the original model to test fitment. After verifying fitment, i imported the model in Sketchup then copied the face from the insert side (smaller) then extruded and angled as i wanted. Works great but i would suggest doing more than 20% infill, i don't think it'll break but if i need to print another one ill be doing at least 50%
i used PLA+ 1.75mm, 195c extruder, and 50c bed