Tiled 3D printing bed

This project is a scalable, Klipper-compatible heated bed system designed for efficiency and flexibility. The bed is built from PCB-based heater tiles (≈100W each) that can be individually powered, allowing selective heating to reduce energy use. A central hub board, driven by an STM32 microcontroller, controls up to multiple channels with individual MOSFET switching and thermistor sensing.

The project consists of 2 types of PCBs, the tiles and the power distribution boards.

Currently there is a 150mm tile and a 8 channel power distribution board.

Images

Heater tile:


Power distribution board:

Specs

The calculator can found here: https://www.desmos.com/calculator/dyaic1mb9s

Per tile:

Measurements	Value
Dimensions	150mm x 150mm
Power	~110W @ 24v
Max Temp	~105°C*

[!WARNING] The max operating temperature depends on the rated temperature of the connector. The thermal fuse blows at around 125°C to prevent thermal runaway, but the current chosen connector (MicroFit 3) is only rated to 105°C.