Update, 2026. This printer is no longer on sale, and the shop links below died along with Gearbest. I have left the review up because the build notes and the general lessons still apply, but do not go hunting for one of these.
What I recommend now for FDM 3D printing: Anycubic. Here is my Kobra S1 Combo review, and my tools page has the rest of what I actually use.
Wait, there were no problems??
Printing from the SD card slot worked perfectly. It’s just like the other CR-10 printers in my collection. One weird thing that I have never heard anyone else report in any of the forums or groups, however. When I plugged in USB it heated on its own. I’ve got a replacement main board sent to me to swap it out, I expect it is one of those weird random things.