OpenSourceEV EVO Phone Mount V4 for Rivian R1T & R1S

OpenSourceEV Parts designs, produces, and shares 3D‑printed parts for Rivian EVs. Staying true to our open‑source mission, every product we create comes with free STL files so anyone can remix, customize, or print at home for little to no cost.

We’re here to empower the Rivian owner community by making DIY customization simple, affordable, and accessible — backed by over 5,000 downloads on our Printables page and our new low‑cost, free‑shipping Creator Kits available on our website.

And if you’re considering a Rivian R1S or R1T, you can receive up to $500 in Rivian Gear while supporting our mission of open‑source enhancements by using our Rivian Referral Rewards code: ROBERT1265188. You enter this code when putting your deposit down on your Rivian. Details are available here.

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This design has recently been updated to V4. Details of what is different are in the description and in this overview:

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The OpenSourceEV Phone Ball Mount EVO is the fourth generation of the best phone mount on the market for the Rivian R1S and R1T. It's designed to tuck in between the gauge cluster and infotainment screen. It's held in place via friction and is easily removable.

This new fourth version of the EVO improves on V3 in a few different ways:

• Dual Function: New to V4, we've integrated a special loop system to allow the phone holder to additionally hold a pair of sunglasses. 
• Strength: Dimensions have been overhauled and the contact area with the infotainment screen has been increased 35% to make the mount even more secure and tighter when installed.
• Strength X2: We're transitioning from a 30MM to a 35MM bolt to make the mount even stronger and more secure.
• Refinement: Contours have been refined so it integrates beautifully with the interior. We've beveled the top and bottom of the holder and moved the ball mount slightly leftward and rearward relative to the cabin for better phone positioning.
• Stability: The mounting balls have been redesigned with a new, textured skin. This allows attached phone holders to SIGNIFICANTLY better secure to the ball with less pressure. Other mounts tend to slip.

The Phone Ball Mount EVO is compatible with all three ball sizes - 17MM, 20MM and 1 Inch. (all models included) The 17MM works with most phone mounts, 20MM works with the co-branded Offroam x Peak Designs products, and a 1" size designed for RAM branded items only.

We print and sell this in ASA, but  a high quality PETG (with a high melting point) will work well too. Print it with supports at 35%. You'll need an M5 bolt and M5x35 nut (m5x30 with older versions) They are available individually at OpenSourceEV.com should you want to purchase - in the spare parts section, or available from Amazon or local hardware stores.

Please note that this mount alone will not hold a phone in your Rivian - it is designed to be an attachment for a 3rd party phone holder. Phone holders pictured are not included. We suggest defaulting to the 17MM ball unless you know exactly what you want. Phone holders are available on Amazon, and we've hand selected and sell a few known-good units on our store.

• This product is available for purchase here: https://opensourceev.com/products/phone-ball-mount-evo
• Spare parts for this product are available here: https://opensourceev.com/collections/replacement-parts 
• Discuss this product at: https://www.rivianforums.com/forum/threads/new-opensource-ev-phone-mount-evo.17448