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Hi Andy,
I have had 2 UC300 controllers and had BOTH of them fail the same way. I also have the Bulkman3d with the UC300 option. Bulkman3d support basically had me do a bunch of useless troubleshooting and then offered to refund me $85 (USD) but I would need to send the old one back.
After the first one failed, I ordered a second one from Aliexpress and it failed 20 minutes into running gcode.
They told me to flash update them but the Windows 10 says "Unknown USB Device (Device Descipter Request Failed).
I can only tell you that I don't think these controllers are any good. And for SURE the SUPPORT is non-existant.
Jason
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Posted at 2021-9-2 00:04:54