This model is designed to be printed without any supports. Mirror the part to make the duplicate on the other side. In PrusaSclicer this can be done by right-clicking the part and selecting “Mirror”. You can then choose the axis in which you want to mirror the part.
If you want to edit this model click this Onshape link: https://cad.onshape.com/documents/c105c0946c923abfc194928a/w/e10157ae0bcec9f676088857/e/76141922ddb368363fdabbb7
You can make a copy to adjust any sizes which may not work for you.
The author marked this model as their own original creation.