3D打印机升级marlin2.x版本固件后出现simplify3D连接3D打印机提示失败Connection failed的问题,如下:

Attempting connection at \\.\COM7...
READ: echo:start
READ: Marlin 2.0.7.2
READ:
READ: echo: Last Updated: 2020-10-15 | Author: (none, default config)
READ: echo:Compiled: Apr 21 2022
READ: echo: Free Memory: 3432  PlannerBufferBytes: 1216
Testing plaintext communication protocol...
Testing binary communication protocol...
READ: DIGIPOTS Loading
READ: DIGIPOTS Loaded
READ: DIGIPOTS Loading
READ: DIGIPOTS Loaded
READ: echo:V82 stored settings retrieved (677 bytes; crc 24722)
Testing alternate communication protocols...
READ: ok
WARNING: CRC mismatch detected
READ:
Connection failed.

解决方案:

Tools>Firmware Configuration>Communication

cambiar comando "start" por "echo:start"

工具>固件配置>通信  把"start" 改为 "echo:start"