Was randomly looking through Thingiverse for things to print and stumbled across a good looking Dice / Mini Holder with a lid that can be used as a Rolling Tray, so I printed it out.
Print File – https://www.thingiverse.com/thing:3628673
Filament – HATCHBOX PLA 3D Printer Filament, Dimensional Accuracy +/- 0.03 mm, 1 kg Spool, 1.75 mm, White
Magnets – 3 mm x 1 mm DIY Office Magnets for Fridge,Whiteboard,Craft,Project,Art – 300PIECES
3D Printer – Comgrow Creality Ender 3 3D Printer Aluminum DIY with Resume Print 220x220x250mm