Thingiverse
I tried a few of the modular trees on thingiverse, and none of them really suited my needs. On the side of some cheap plastic Adirondack chairs, was a flip out cup/phone/keys/sunglass holder. It works really well. So I took the rough dimensions from the sunglasses component, and walah... Designed to be 4 walls thick, with a .4 nozzle. Shouldn't matter if you use infill or not.A couple little dabs of hot glue, and they were done...
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This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Check the license (see original page) on the original Thingiverse page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.