MKS Tinybee

[AndreKR]

I’m shopping for a new board for a 3D printer and a popular board that I can easily get is the MKS Tinybee.

It uses an ESP32 as MCU and shift registers (74HC595) as port expanders.

I found a fork of the Klipper MCU firmware for ESP32 here, so that should work.

But as far as I can see Klipper only supports I2C port expanders, specifically the SX1509? And changing that doesn’t seem easy - in fact I don’t even understand how currently a stepper controlled through an SX1509 would work, the SX1509 pins seem to be converted to I2C commands on the klippy side, but the stepper pins are controlled by stepper.c on the MCU side.

Has anyone else looked into this?

[cardoc]

I personally would avoid MCU’s that aren’t officially supported by Klipper.
Did you read the readme?

Forks like this tend to end up suddenly unsupported and strand users with an out of date version of Klipper and no upgrade path.

[hcet14]

You may have a look here Why is Klipper not compatible with ESP32? - #2 by jakep_82.