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The Mazda 3 keyfob (2019 and later) sucks! This video shows you how to shrink it down.
The 3D printed design can be viewed here: a360.co/3vmkqH4
The Autodesk Fusion 360 design files can be found here: drive.google.com/drive/folder...
This work is licensed under Attribution 4.0 International. To view a copy of this license, visit creativecommons.org/licenses/b...
Music: www.bensound.com
Update: I've been using the keyfob for over 2 years. A couple issues: 1) the battery starting losing connectivity in the first month. I tinned the copper tape with solder, and the issue went away. 2) just recently, the battery started losing connectivity again. I opened up the case and a TON of dust had seeped in. I cleaned it and the issue went away. The dust is coming in thru the OPEN/LOCK buttons, so I added some tape behind them to seal it, so it hopefully doesn't happen again.
Otherwise, still working great!