Rotate the model onto its side for layer strength. I used 15% triangular infill for my print, but if you need additional support increasing the infill should be fine. If all else fails, increase stand_thickness.
phone_width - [mm] How wide your phone is.phone_thickness - [mm] How thick your phone is.stand_height - [mm] How tall the stand should be.stand_thickness - [mm] How thick the stand's supports should be.stand_angle - [deg] The angle from vertical your phone should be held at.slot_width - [mm] How wide the cable slot should be.gap_height - [mm] How big of a gap to leave under the phone.The author marked this model as their own original creation.