CUBE INSIDE A CUBE

I MADE THIS TO LEARN HOW TO USE SOME FEATURES ON DESIGN SPARK MECHANICAL. ALSO I WANTED SOMETHING THAT POSED A CHALLENGE TO PRINT. I COULD DO IT USING SUPPORTS NO PROBLEM BUT THEY ARE PRETTY DIFFICULT TO REMOVE FROM THE INSIDE. I WANTED TO DESIGN MY OWN BREAKAWAY SUPPORT SYSTEM TO LEARN HOW TO DO IT. I WAS SUCCESSFUL AFTER ABOUT 10 TRIES. THIS IS THE FINISHED PRODUCT AT THE BEST SIZE I COULD FIND TO GIVE A NICE FINISH ON THE HOLES. I HAVE ONE WITH SUPPORTS AND ONE WITHOUT IF YOU PREFER TO USE YO