After, many, many stumbles, I attempted my first print. It was going well, at first, and then the filament stopped feeding. The QU-BD One-Up’ filament feed is quite crude, with minimal tensioning capability. There are folks with fixes posted on the Internet, so I’ll be reading those in detail. Also, the extruder temperature and/or feed rate are not correct. Anyway, I was pretty happy to get it to do anything. The video at the link below shows it printing a Suburu logo while the filament feed was working.
UPDATE: I adjusted the filament tension and attempted a second print of the Suburu logo. It turned out better but some fine tuning is still needed. I think that, in this case, the extruder head was too close to the bed, causing fattening of the print surface. Possibly something else is wrong, like too much filament tension. I only know enough about 3D printing to be dangerous. I am, however, happy to see the 3D printer working as well as it is. I suspect that the only obstacle to complete success is my own ignorance about the subtleties of 3D printing. The photo below is the somewhat mutilated Suburo logo.