I wanted to organize my kids' shoes and coats to make them a little tidier and at the same time easily accessible to the toddler. 

They can screw into something with 4mm diameter countersunk wood screws (length will be dependent on your own needs, but minimum 10mm).

You can hang shoes, coats and anything else that needs hanging to tidy up. 

Usable by adults too!

Printing: 
The more walls and higher infill you use, the stronger it would be. I would suggest most likely printing it out of PETG to benefit from its great layer adhesion.