The only thing I can truly recommend is using supports for the hex installs on the rear of the mount. Other than that, any infill you'd choose and make sure that it's fully locked into place before hanging your phone in it. I also recommend, if using a 0.4mm nozzle, to use walls at 0.65mm for all settings so that the wall between the MagSafe charger and the phone is both dense enough and thin enough to provide charging.
The author marked this model as their own original creation.