I have a toll transponder that I’ve never attached to my windshield because I didn’t like how the white transponder stuck out like a sore thumb.  I typically just keep it in my glove box until I need to use it and then just place it on the dash.  In my old car, the defrosting vents kept the transponder nice and secure.  In my new car, the vents and the windshield are too close together that placing the transponder in the same location does not provide a secure hold and it flies across the dash when making any slight turn or acceleration. 

In order to solve this, I designed a transponder holder that 1) hooks on to the vents, 2) has the same profile as the dash, and 3) blends in with the rest of the dash.  I also made it so that the transponder is easily accessible in the off chance I ever need to access it.  The cap is press fit into the holder and holds everything in a secure fashion.

The 3d print for this model was rather simple.  The key thing to this print was to change the type of support used for the “hooks.”  I changed out the support to “tree” and the print took about 2 hours.

After the first print, I needed to make a couple of revisions.  The first one was too big/long.  The second one didn’t account for a particular curvature in the transponder. The third one fixed all these issues and the result is what you see below.

The fitment in the car is great.  The hooks fit between the vents, the slope of the holder matches the dash, and the studs to prevent excessive left/right movement fit into the speaker recesses.  Also, the color almost matches perfectly and the texture from the build plate makes it look like it’s part of the dash.

Overall, really happy with this.  The only thing I did have to modify was to add a little dab of hot glue to make sure the cap is extra secure.  It’s fine as is, but I wanted to make sure I didn’t come apart by accident, and the hot glue still allows me to take the assembly apart if needed.

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