It is an awesome toy if you do it right it can be used as a bath toy as well as a pool diving toy

Tips

1.  100% infill otherwise it won't sink

2.  Use slim tree supports 

3.  You can size it up or down any size sinks. NOTE: if on 100% in fill

4.  Size it up if not it will still work but is very small

Warning

This is my first model I have ever made but I have printed it, and it sank. So hopefully it will work for you.