Only thing you need is a IKEA TISKEN (← click to open). Print both parts, insert first part onto the IKEA holder and slide the second part in. This is second part of my IKEA TISKEN series, so in case you are in a need of phone holder, go check it out here! :)
Printing details
*In my case, I was able to print this very well without supports using bridging only
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In case you have any requests, feel free to send me a message and I will try to help you out!