The main case file will fit on a phone without the back plate, but fits better with it. The case section MUST be printed in a flexible material, like TPU. The plate should be a more rigid plastic such as PLA, which will make everything feel more solid. You won't need to glue them together; inserting the phone into the case will hold everything together perfectly. I've included two variations of the back plate, one to be used as a blank plastic plate by itself, the other as a core for a fabric wrapping (which is smaller, to allow for the tolerances of a thinner cotton-like fabric). T-shirt thickness should be fine. I've included a STEP file for the blank plastic version of the plate, so that you can boolean your own design to the plate in CAD software if you wish to.
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Iphone 13 mini case by Wickedbanana, Download free STL model
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Free STL file iPhone 13 Pro + Mini Flexible case đ±ă»3D printer model to downloadă»Cults
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TPU Case for iPhone 13 Pro by EnDiMa_Designer, Download free STL model
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Free STL file iPhone 13 Pro + Mini Flexible case đ±ă»3D printer model to downloadă»Cults
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Free STL file iPhone 13 Mini Case - TPU version (Mk 4) đ±ă»3D printing idea to downloadă»Cults
Free STL file iPhone 13 Mini Case - TPU version (Mk 4) đ±ă»3D printing idea to downloadă»Cults