I modified this awesome flight case/lunchbox thing by Greg_The_Maker to fit on a Prusa MK4S print bed (210x250mm).

In my case it's barely big enough to hold my 3.5" FPV drone, goggles, controller, and a couple batteries.

Summary:

• "Flight_Case_Top" is deepened so it's the same height as the bottom piece.
• "Flight_Case_Top," "Flight_Case_Base," and "Flight_Case_Seal" are squished on the X-axis and stretched on the Y-axis to be the maximum footprint allowed by my printer.
• All divider notches removed from "Flight_Case_Base" and "Flight_Case_Top."
• Printed in PETG, but not sure I would recommend doing that without an enclosure as I got a lot of warping.
• I used button-head M4 machine screws, nuts, and washers instead of grub screws. I did have to reem out a few holes with a drill to allow them to fit.
• The original handle, catch, and catch arm still fit properly.