Read a three-print phone case

This mission is a manufacturing read-through, not a request to redraw a phone from scratch. Follow one shared camera datum from the TPU shell into the two PETG pieces. The final source is the current composite camera-frame model; do not substitute an older open-lattice or single-piece case.

One design, three printable parts {#materials}

One assembly produces three exports: the flexible TPU case, a phone-side PETG inner island, and a camera-side PETG snap island. “Two-piece camera frame” means the two PETG pieces cooperate at one camera cluster; it does not mean the TPU shell disappears. Keep material jobs separate: TPU supplies enclosure and capture compliance, while PETG supplies the rigid, flush camera frame.

Trace the TPU envelope {#phone-shell}

Start with the pocket rather than the decorative rear surface. Phone width, length, thickness, corner radius, pocket clearance, wall thickness, and rear panel thickness define the shell contract. Port and button cutters are then subtracted from that positive body. When a fit changes, change the named clearance or wall control; do not move a cutter by an unexplained offset.

The current source also cuts the camera-frame seats from this TPU part. Those seats use the same measured camera, microphone, and flash datums as the PETG pieces. That shared datum is the relation to inspect before changing a dimension.

Distinguish authored from generated pattern {#lattice}

The rear treatment is a positive edge lattice: struts are explicit geometry joined to the shell, not holes pretending to be a Voronoi algorithm. Read the lattice-strut component as a reusable segment between two declared endpoints. The finished case may contain many such authored edges, but the source makes no claim that it can regenerate a new Voronoi graph for another phone.

Treat this as a boundary: changing the shell envelope can preserve the frame and fit relations, while changing the authored lattice requires new authored edge data and a printability review.

Place the PETG islands {#islands}

The inner and outer PETG islands are the two parts of the composite camera frame. Both are built from the same three lobe centers: camera, microphone, and flash. The inner island provides the phone-side seat and a female capture groove. The outer island provides the camera opening, hidden snap skirt, bead, and repeated relief slots. The microphone and flash remain open through both pieces.

lens-clamp-fit-clearance, capture thickness, snap engagement depth, and snap interference are named fit controls. They are not cosmetic knobs: changing one requires inspecting the matching TPU cut and the opposing PETG feature.

Inspect the complete assembly {#case-solution}

The final source is the current three-export model: one TPU shell plus the two PETG camera-frame pieces. Its preview positions the PETG pieces beside the shell so their separate printable roles stay visible; that is an inspection layout, not a claim that they print as one merged solid. The camera frame itself is a composite of two mating pieces, not the old simplified one-piece camera pad.

Check the flush-stack relation before trusting the view: captured TPU plus the inner PETG thickness equals the rear-panel thickness. Then check that the snap through-cut, inner groove, and outer skirt use their named clearance and interference values consistently.

Make a coupon before committing {#fit-warning}

Print a small camera-frame coupon before the full case. Include a short piece of TPU seat, the inner PETG groove, and the outer PETG snap skirt. Test the actual filament pair, nozzle, layer height, and slicer settings. The model preserves the relation; the coupon decides whether the chosen clearance and interference are usable on this printer.