This does not fit the P1S. It looks like the bottom of the P1S is different than the P1P, I am remodeling the stand and hope to have a remix uploaded soon.
My first image is the bottom of the P1P which has more space and thin walls, second image is my P1S which has a large plastic plug and thicker walls.
So now the gaps between the walls are 2.5mm and the smaller of the two square posts in your model are now 8.5mm. The distance between the two smaller square posts is now 102.5mm. Finally, I shortened the feet to 1.5mm and attached some 12mm x 3mm rubber feet to them so the feet are now 4.5mm-5mm in height.
The fit works, but definitely not perfect. Once it slots in, there is a little "click" when the back tower comes flush with the machine.
Now to test how it holds up to vibrations during printing...
if you are using this version and have the anti vibration feet fitted then you need to download these rubber feet to fit with it
if you dont have tpu handy just print from pla until such time as you have tpu available
https://makerworld.com/models/69032#profileId-73264