Varia RCT715 Quarter Turn Puck

Garmin changed how the RCT715 attaches to a bike compared to the RTL series. It's more durable, but isn't compatible with many of the numerous third party mounts on the market and even on this site.

This puck fits on many of those mounts and uses the same quarter turn action as the RTL Varia radars and Edge computers. There is a separate one for Garmin mounts with the threads in the puck, but it probably is not as strong as the others due to the M3 nuts taking up too much space. It's also not recommended to use this puck with a rubber band style mount (like the one pictured) due to the added mass and bulk of the RCT715.

This puck should fit most mounts that take M3 bolts with a hole spacing between, and including, 20 to 22mm. It needs flat head screws, and make sure enough threads engage in the mount.

I built this on a Bambu Lab A1 with a 0.20mm layer height and 0.42mm line width with half a dozen wall loops, almost the same number of top and bottom layers, moderate infill, and no supports. PETG is used for its suitability for outdoor use, availability, and ease of use.

Note that I have not done extensive on-bike testing of this mount, so I have no idea how durable it is or how it might fail.

Even though the Varia radars do not have provision for attaching a tether, I recommend using one with most 3D printed mounts or pucks such as this one. There are aftermarket solutions that have tethers and appear to be compatible with this puck- backless cases or sleeves, or self adhesive attachments. Note that some cases cover the back enough that they might not work with this.

There might be a little bit of radial play with the Varia in the mount. If this bothers you, try scaling X and Y down by a fraction of a percent or so, or feel free to modify the source model.

The reinforced versions with more support all around the puck also have space behind the detent springs that goes through to the bottom of the puck instead of being a short blind hole. This should give more space in case dirt or other contamination gets in the slots by the detents, but the holes are also another potential point of intrusion. And the flathead screws are recessed a bit to make it easier to reuse screws from other pucks.

The closer fit versions might not fit depending on your printer. Though the closer fit versions I printed don't have as tactile of a snap when twisting the Varia in, it should take a bit more force to accidentally twist them out the wrong way. The models could be iterated another time to make them feel better, but I've printed enough versions as it is.