Barack(MixamoRigged), is a character built and published by using the Cinema 4D Volume Builder and Volume Mesher, Combined to a #Powetri Character GIzmo that helps to build concept characters with ease.
The output is not a 'clean' mesh but this could be achieved by the retopologize process.
The character is part of the POWETRI series and the main purpose is to use it to be rigged and animated in Adobe Mixamo. It can be exported to .FBX or .OBJ without problems.
As for their mesh buildup The POWETRI series is a series of characters that will seldom be the star of an animated movie, but play their parts very well as extras or crowds in the background.
Second the characters are great helpers to build the outlines and concepts of a movie and inspire to build ideas on different personalities.
Besides the character has an .STL version that is optimised for 3D print and can be found on this website under the same name. For me it worked out fine on the pleasantly affordable JG Aurora A5 .But i assume it will also turn out well in more sophisticated equipment.