vladisenko designed this micro size flight controller board for Eachine E010 frame:

vladisenko/EachiWhoop

• Processor: STM32F103CB
• Gyro: MPU6500
• Receiver: Flysky AFHDS
• Weight: 1.44 grams
• Voltage: 1S Lipo battery input
• Firmware: patched Betaflight

Vladisenko has shared the board on OSH Park:

Note: choose “2oz 0.8mm” option.