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retro clock with MAX7219

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retro clock with a 4x64 LED matrix panel MAX7219 and your custom controller (for example esp32 )

Updated at source: Aug 20, 2026

Model information

Quantity	Component	Description
1	MAX7219 Dot Matrix Module
1	ESP32 C3 Super Mini	Or use whatever mcu you like to attach
1	USB C Breakout board	Optional for power supply
1	PCB 4x6	Optional for mounting esp32
8*	M2* Screw	4 for Back to Body attachment; 4 for mcu mount
8*	M2 Heat Insert	~

*dependence on you mcu mount .

General: Nozzle 0.4mm; Layer Height 0.2mm

I have set "Iron all top surfaces" to get a clean and smooth transition between the parts.

Part	Remarks
Front Frame	Iron all top surfaces
Front	Smooth Plate Iron all top surfaces With a dark filament add a stop before layer 2 and switch to a clear/light one. (Display area is 0.6mm (3 layers @ 0.2mm, there will be no light if all layers are black)
Body	Smooth Plate Iron all top surfaces
Back	Iron all top surfaces
Feet	Print this last and keep it on the build plate as a positioning reference!

The connection points are for alignment only and are not intended for fastening!

Clear holes on Back-Part which are covert by one layer for print support.
Attach MAX7219 to Front. This just holds by friction. Therefor the front part has a tight fit with small tolerance (feedback is welcome).
Attach and glue Front to Body
Attach and glue Frame to Body
Don't use glue for Back - Body connection.
Insert M2 heat Insert to Body.
Still don't use glue for Back - Body connection.
Attach your MCU to Back.
Screw Back to Body.
Attach Feet to Body. This is one way only! The connection points will break if you try to remove it, so take a breath and do it right the first time, with glue!