Airtag Saddle Mount for Specialized SL7

thingiverse

**Disclaimer: I have owned my 3D printer for less than a week and this is my first (re)design ever--with less than an hour spent in Tinkercad to date. Apologies in advance for you veterans who see some sloppy work in the .stl file, but I think the end result came out really well! Note the photos are all close ups and make the unit look ungainly and large, but in real life, it's well proportioned and quite stealth.** ***UPDATE 8-17-2021***: I have added a couple more renditions for S-Works for print with 0.2mm nozzles (required because std 0.4mm nozzles don’t have enough resolution for the smaller font size). I also realigned the right countersink as it was misaligned in my original file. **** I was glad to find Eric Chu's design for this Airtag saddle mount when I recently purchased my Specialized SL7. The original plan was to print a bottle cage style Airtag mount, but when I installed it, it was too conspicuous and raised my bottle cage off the frame too much. Also, aesthetically, I thought it looked pretty bad. This saddle mount is invisible from the side and looks great when viewed in a pace line. I actually printed a remix of Eric's mount (designed for his Merida e-bike) first and really liked it, but when I installed it on my SL7, there was very little clearance between the bottom of the saddle base and the top of the mount. Since my SL7's stock Body Geometry Power Pro saddle has a carbon base, I didn't want there to be contact of any kind. So, in this remix, I decided to slice off a wedge from the top of the rear piece, which creates a couple mm of clearance between the mount and the bottom of the saddle base. I'm also really picky about things looking as OEM as possible and since the back of the saddle is one of the most noticed areas on a bike while riding in a pace line, I decided to add some Specialized branding with their distinctive hand-scrawled "S". I like the look of the "S" and I think it obscures the purpose of the mount more than having a curious blank piece of plastic mounted there. Due to the "S" being raised text, I printed the plate upside down, with the S on top. This made the use of supports necessary, which crapped up the print a bit more than when printed right side up, but the rough spots are all encapsulated inside when assembled, leaving the visible areas pristine. I added a square of double stick foam tape inside to adhere the Airtag to the back of the mount as I found that there is enough room inside for the Airtag to rattle around without it. M3 nut recesses on the back work well with 11 or 12mm M3 Hex Socket screws (Stainless steel kits available on Amazon with various lengths for a few bucks). All in all, I'm thrilled with this design, it looks slick, and the Airtag works really well through it.