Source: hardware/enclosure/README.md

Enclosure (v1 prototype)

tag_case.scad is a parametric two-part case: base + lid. Every key dimension is a parameter at the top of the file. Measure your actual parts with calipers and edit before printing. Anything marked MEASURE in the file is a guess.

openscad -D 'part="base"' -o base.stl tag_case.scad
openscad -D 'part="lid"'  -o lid.stl  tag_case.scad   # already flipped face-down
openscad tag_case.scad                                 # exploded preview; console echoes the envelope

OpenSCAD wasn't installed on the machine this was written on, so the file has not been render-checked. Open it in OpenSCAD (F5 preview, then F6 render) before your first print.

Layout (default parameters)

Cavity is about 80 × 38 × 22.5 mm. Outer body is about 87 × 45 × 27 mm, plus screw lugs on the ends.
Lower layer: a 503450 LiPo resting on the two mount bosses.
Upper layer: the RAK19007 stack sits on 1 mm shelf rails.
End bay: the piezo hangs from a collar under the lid and sounds through a 3 mm port. A 10 mm recess on the outside of the lid takes an adhesive acoustic vent membrane.
Seal: 1.5 mm silicone O-ring cord sits in a rim groove. A 0.2 mm tongue on the lid gives about 33% squeeze. The lid screws (4 × M2 into heat-set inserts) are in external lugs outside the seal, so the screw holes are never wet paths.
Mount: 2 × M3 heat-set inserts go into blind holes from the outside bottom. They never break into the cavity. Bolt the case to a blank visual ear-tag panel through holes you punch at mount_pitch.
Programming: open the lid, or use BLE DFU (the RAK4631 supports OTA over BLE) so the lid stays shut.
GNSS patch antenna: stick it to the underside of the lid, above the board. stack_h must include the patch thickness if you mount it there.

This is bigger than Cornell's 7 × 4 × 2.5 cm nylon V2. That's expected: v1 proves function and v2 shrinks it (see ../BUILD.md). Weigh the finished tag. The target is under 60 g on the animal, including the ear tag.

Print settings

	Bench / walk tests: FDM PETG	Field / on-animal: SLA tough resin
Material	PETG (dry it first: 65 °C for 4 h; wet PETG prints porous)	Tough/ABS-like or "Tough 2000"-class resin; UV-stable if available
Layer	0.16–0.2 mm	0.05–0.1 mm
Walls / infill	4 perimeters, 5 top/bottom layers, 40% gyroid	Solid; drain holes not needed
Nozzle / temp	0.4 mm, 235–245 °C, bed 75–80 °C, fan 30–50%	Per resin datasheet
Orientation	Base: open side up. Lid: outer face down (the `lid` export already flips it)	Base: tilt 15–30° so the rim and groove don't sit on supports; supports only on the outside bottom. Lid: tilted, supports on the inside face only, never in the groove or tongue
Post	Heat-set inserts at about 230 °C. Leak-test: dunk for 10 min with a tissue inside	Wash, full UV post-cure (brittle if under-cured), then inserts

FDM parts leak through layer lines more often than through the gasket. For any wet test, brush a coat of thin epoxy or XTC-3D on PETG parts, or use the SLA version.