This model came pre-loaded on my AnkerMake M5 printer. AnkerMake Slicer provides no function to download a model file from the printer to your computer. I emailed Anker to ask about it, and they sent me this file, so I am sharing it here as is in case anyone else wants it.

Should this model NOT be in the public domain, please let me know, and I will remove it as soon as possible.