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"
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