The main function of the ATtiny is acting as a battery friendly low power co-processor for the ESP. A bit like the ULP low power co-processor of the ESP32, except with a lot more IO functions and ...
Custom firmware Mod V3 MARLIN bugfix-2.1.X for LABISTS X1 mini 3d printer with some changes in Malin code, is possible to EASYTHREED X1, K1 and SONDORI PICO printer with ET4000 V2 card ...