Designed this with the intention of keeping our kids entertained which it has for hours, I have uploaded two models one being a smaller test piece to check to make sure the tolorances is okay before printing the larger model which i would recommend printing the smaller test first. 

NOTE : - Print smaller test piece first to check all okay before attempting the larger one

                No supports required just print in place

                DOWNLOAD THE STL/CAD 3MF FILES TO BE ABLE TO PRINT THE LARGER ONE