I've designed this system from a parameterized model to output trays and bins of various sizes and depths. The baseline module is roughly 8x8x2 studs measured externally. I have generated models between 1 and 3 modules wide, between 1 and 3 modules long, and between 1 and 4 modules deep. The largest is roughly 24x24x8 studs measured externally. The walls are roughly half a stud thick with a half a stud fillet at the bottom to make it easier to pull out pieces.

[https://youtube.com/watch?v=L6-tfK6DYog](url)

Magnets are placed at the interior of all 8 corners of the module prism with alternating polarity direction. This enables trays to have some attraction side by side, but crucially also enables trays to stack one on top of the other OR top to top OR bottom to bottom. See the final image for more detail on magnet orientation.

See my profile for other sized modules:

8x8x2
8x16x2
8x24x2

8x8x4
8x16x4
8x24x4

8x8x8
8x16x8
8x24x8

16x16x2
16x24x2
16x16x4

16x24x4
16x16x8
16x24x8

24x24x2
24x24x4
24x24x8

These trays use 5x3mm Neodymium magnets - typically available from Amazon or similar for 2-3 cents each.

Magnets required:

8x8 - 8
8x16 - 16
8x24 - 24
16x16 - 28
16x24 - 40
24x24 - 56

You could easily install fewer magnets if you wish.

Be aware that installing magnets will impart a “directionality” for trays where the width does not match the length. Essentially two “rectangular” trays will always want to be either parallel with each other or perpendicular, so keep that in mind when installing magnets.

The trays in the image were all printed with Bambu PLA Matte on a Bambu Labs P1S using the stock 0.20mm Standard @BBL X1C profile and no supports. I suspect you could probably reduce infill without issue. You can typically fit a 3x3 module grid on a single build plate - so one 24x24x? or nine 8x8x? or whatever in between.

Modular Magnetic LEGO Tray System

LEGO_8x8x2.3mf

LEGO_8x8x4.3mf

LEGO_8x8x8.3mf

LEGO_8x16x2.3mf

LEGO_8x16x4.3mf

LEGO_8x16x8.3mf

LEGO_8x24x2.3mf

LEGO_8x24x4.3mf

LEGO_8x24x8.3mf

LEGO_16x16x2.3mf

LEGO_16x16x4.3mf

LEGO_16x16x8.3mf

LEGO_16x24x2.3mf

LEGO_16x24x4.3mf

LEGO_16x24x8.3mf

LEGO_24x24x2.3mf

LEGO_24x24x4.3mf

LEGO_24x24x8.3mf

A more contemporary design for Formula 1 cars to use in the Formula D board game. I wanted to have enough cars to recreate the full grid and give players a choice of any current team/driver.
 
I am in the process of painting these to match the 2024 liveries as they are revealed.
 
These are designed to print well without the need of supports or brims.
 
Some of the pictures show earlier designs paired with this version. Some pictures include models printed with a .4 nozzle at .08 layer height and others show models printed with a .2 nozzle at .06 layer height.
 
I've also messed with designing some multi color prints to get the liveries without the need of paint, but haven't had the filament to try them yet. I may add more print profiles later.

Formula D - Contemporary F1 Car miniature

FormulaD - Car.3mf

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