MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Very cool design, but terrible fitment - the sizing of question marks and screws doesn't account for any material expansion from 3D printing. Be ready to spend some time carving them to fit onto the cube after printing (which already will take 12h+) and have some super glue ready.
Advice to the author - leave a bit of wiggle room when dimensioning the elements that are supposed to connect together. This is not a perfect world - and hobby grade 3D printers don't keep the dimensions that well.
In case of screws, I recommend re-scaling them to 90-95% of original dimensions.
But for questions marks, it's not as easy - they need to be "slimmed down" and not simply re-scaled.
I recommend looking at a remix:https://www.thingiverse.com/thing:2517867
and fixed question marks provided in comments for that remix:https://www.thingiverse.com/thing:2705238