Small criticisms and minor ways I would have done this differently first, then the stuff they got right second.
So this seems to be designed for mounting to a conduit box, and I would have liked to see some way of routing the cord between the mount and the wall. As it stands, I'll be spending a few minutes with a mini-file cutting a channel for the low-profile cord so it'll sit flat against the wall even with the cord passing between the wall and mount. Personally, I could modify the design in about 5 minutes, so I would really like to see a revision for the future. Another minor criticism is the lack of cable color options. Some 3:1 3/4" heat shrink tubing in white would have given me the option to run the cable as unobtrusively as possible to a USB extension against my white walls. It's how I would have done it, but that is absolutely a minor criticism. Another small consideration that would have probably gone over well would have been to do some sort of surface finishing on the wall-side of the mount. The print lines are nice and neat, good job there, but printing on a glass surface with a shorter first layer height but the same or slightly reduced feed settings, and a heated bed (I don't know what these were printed on, but my experience is with a heated glass bed) for the first layer or two will cause the filament to "splort" out a little, and it ends up with a MUCH smoother surface, which is what I ended up needing because I'm using a fair bit of wall-safe double-stick tape to secure this (I rent, and try to put as few holes in the wall as possible), and so I had to do some fine-grit sanding to get a smoother adhesion surface, so that additional consideration for more versatile mounting solutions would have been nice. I believe this is also PLA filament, and I personally would have printed in ABS for durability and more importantly, UV resistance. ABS would have allowed for a very smooth mounting surface by brushing said surface with a light ABS/Acetone slurry too. I understand that ABS is more finicky, but in my experience, investing in a setup that reliably prints well in ABS is a leap forward in what it enables you to do. If I remember correctly, another filament that would provide excellent UV protection for something that could catch daily afternoon sun is ASA. It's a little more exotic than ABS, but it would be another leap forward in quality, and something at the back of my brain is telling me it's less difficult to print with than ABS too.
Now that the ways I would have done it differently are out of the way, the things they got right. The tolerances are excellent for the materials. Very good job, I can tell that some effort was put into making this fit properly against the tablet, and in the press-fit of the two halves. The printer used is obviously high quality, or at least the time has been taken to iron out kinks and get it dialed in. The fit is very secure, the only way I can think of to realistically improve the way the front and back of the mounts fit together would be to use several small neodymium magnets, which would be superfluous and add extra cost and lead time. The cord choice was excellent, it looks hand-assembled, which if that is the case, most excellent job on that. Lowest profile USB-C 90 degree connection I have seen by a factor of at least 5. And the channel used to give a gap between the mount and tablet was just right. The variety of supported tablets is something also worth mentioning, I was having a hard time just finding a regular case for a Samsung A7 Lite I could attach to the wall, and here a ready-made product exists for my exact need.
Does it function as well for my specific use as I could have designed and printed? No, but it comes damn close, and it would take me hours and hours just to get it to the same level of this mount, so for ~$30, I'm quite happy with what I received. Consider an upgrade to your printer, modifying your print settings, and make some minor tweaks to your design to accommodate alternative mounting strategies, and you'll have a PEERLESS product.
