Bookshelf Corner Brace 50 mm

Now that I've fixed the kink in the middle of our leaning tower of books, it was time to fix the leaning problem that originates from the base of the bookshelf. This is a pretty minimal corner brace and is 50 mm each way.

The holes at each end have a diameter of 5 mm, so M4's (M5's if you scale the model to your plastic appropriately or don't mind threading into the model a bit) should do.