If you have made on of these learning towers for your kid, I highly recommend adding some foots so the tower is more protected from tipping over. This does not eliminate the chance of happening, as you know kids will find a way to do so. ;) However it will be much more secure.

You have to print the left and right foot each. They can be slid on the foots and additionaly can be screwed on from the back. You can add the same ones on the backside foots for extra safety.

I recommend adding some felt protection on the underside so your floor does not get scretched.

I recommend using PETG with 3 or 4 perimeters and infill above 30%.