Bottlecage Step for kids

My boy is 3 years old and is in a "I-don't-need-your-help"-stage of his life, so I'm not allowed to help him onto his seat on my mountainbike.
So I made him this step-thingie as he was using my bottlecage at a steppingstone to get all the way up :)

I printed mine in PLA and it's holding up quite nicely but PETG will probably work better.

As a sidenote I can highly recommend this seat if you would like to go mountainbiking with your kid - mine has a blast in the forest.