Update 18th of January 2016
As a thanks for the massive amount of downloads and feedback, here are updated versions for both sizes and a completely new version (also for both sizes).
The files named "H6" are updated from the old version, they have a slightly thicker frame to prevent breaking when the charger is inserted. Some sanding/filing is still required unless you want to scale it up to 101-103%. Hard to say exactly how much, as all printers are slightly different. This version needs support, and maybe a raft (I use rafts).
The files named "T1" are completely new. Even smaller than the previous version and needs no support. The cable exits on a slightly higher angle, so it might interfere with some bands, let me know if that is the case and I'll see what I can do. The higher angle makes it so that its flat on your nightstand even without the weight of the watch, or something tacking it down to the surface. My custom 24mm nylon-strap which is rather stiff works fine with this, but any feedback is appreciated. The only finish-work I did was to remove the raft.
The 38mm-versions are not tested (as I don't have one), so if they're wrong please let me know as soon as possible.
Hope you like it! :)
My prints were done at 0,2mm layer height, 3 shells, 8% infill, with raft, support on "H6", none on "T1".
Inspired by the "Nightstand-mode" in watchOS 2, here's a couple of horizontal nightstand-charging-stands... I use some blue-tack on the underside to prevent it from sliding around when I try to shut the alarm up in the morning. Enjoy. :)
Rotate 90 degrees so that the base is flat on the buildplate. 200 micron, 2-3 shells,. Maybe a raft. Support only needed on "H6".