I designed this drawer to keep all my accessories in order: hotends, nozzles, Allen keys, fans, cutters... The drawer is just the right size to fit the instrument box that comes with the a1 mini. As you can see from the photos it fits perfectly because I made it to measure. I studied this solution to optimize the space since I have the prints on a shelf. In the file you will find drawer and rails, printed and mounted. I used glue to attach the rails to the shelf where I mounted everything, but there are also two holes for screws, I recommend using glue or double-sided tape for greater tightness.