Xbox One S Controller Phone Mount with Modular Mounting System by jerwil on Thingiverse: https://www.thingiverse.com/thing:2553522

Summary:
Update 6/4/2024: User Chicaneau has created a stronger version of the M5 25mm bolt. Give it a try if you're having trouble printing the one that was included. You can find the design here: M5 25mm Bolt for xbox controller phone holderUpdate 6/17/20: Thanks to user  EthanSpitz123 for creating a new extended version of the phone clamp for use with tablets. Check out the remix here: Tablet Clamp Modular Mounting SystemUpdate 12/8/19: Due to popular demand, I've added the files from the modular mounting system, so this should now be a one-stop-shop for all the files needed to get this working. However, the phone clamp has been updated since I created this design, but the controller mount should still interface with it (confirmed to fit and work by HoaxXBL's make: https://www.thingiverse.com/make:740947 Thanks for posting!).A clip to mount your smartphone or tablet onto an Xbox One S controller. This is remixed from the XBox One Controller Tablet Mount here on Thingiverse.I modified it to be compatible with the Modular Mounting System since I really like their phone mount design. I will note that I was unable to get all the buttons on the controller working when paired with my android phone. I ended up using my wired Xbox 360 controller instead, and I remixed a mount for that as well.Thanks to Running_Banana for summarizing the parts you need to print:1x Xbox One Clip with Modular Mounting System1x Phone Clamp Up with Tab1x Phone Clamp Down1x M5x25 Bolt1x M5x65 Bolt2x M5 Nut1x M5 Knob Short1x M5 Knob for Phone