LUME Current Build Spec - K11 + Top Display + Arducam

LUME Current Build Spec - K11 + Top Display + Arducam

Date: 2026-04-30

This is the current approval target for the LUME physical build. It replaces the earlier Jetson/SVPRO-oriented assumptions from the old print queue.

Design Intent

• Compute is the GMKtec K11 in the rear T-form pod.
• The ZHAOCAILIN 11.3 inch 1920 x 440 mini monitor sits on top of the bar in a low cradle. It is not cut through the bar body.
• The Arducam IMX586 USB 3.0 camera sits in the right-front auxiliary camera bay with its own printed mount and Type-C cable relief.
• The Orbbec Femto Mega remains centered on the front face.
• The K11 ports live in the rear pod. The bar rear now has a pod umbilical/feedthrough interface instead of visible Jetson-style ports.

Symmetric two-Arducam option: see `LUME_SYMMETRIC_CAMERA_VARIANT.md`.

Approval Mockups

Review these images before printing anything large:

• `renders/approval/approval_bom_contact_sheet.png` - all current views in one image.
• `renders/approval/femto_datasheet_fit_contact_sheet.png` - Femto Mega datasheet drawings plus current CAD fit check.
• `renders/approval/approval_bom_hero.png` - 3/4 form-factor view.
• `renders/approval/approval_bom_front.png` - front view showing Femto and Arducam placement.
• `renders/approval/approval_bom_top.png` - top view showing the monitor and rear pod.
• `renders/approval/approval_bom_ghost.png` - ghosted view showing mounts, cable path, K11 sled, and Arducam bracket.

Source scene: `lume-approval-scene.scad`.

Wiring/service plan: `LUME_WIRING_SERVICE_PLAN.md`.

Real Component Assumptions

Dimension source audit: `LUME_DIMENSION_SOURCE_AUDIT.md`.

Approval V2 STL Folder

Corrected, non-destructive exports are here:

`exports/approval-v2/`

These are for validation only. The existing prearranged 3MF files are not updated yet.

Current plate-level print queue: `PRINT_APPROVAL_QUEUE_CURRENT.md`.
Current OrcaSlicer approval projects: `print/3mf-current/approval-v2/` and `print/3mf-current/approval-symmetric/`.

Part Count

• Test/calibration pieces: 4 coupons.
• Final printed STL objects: 14.
• Final physical printed pieces: 15, because `splice_plate.stl` contains two physical splice plates.
• Total printed physical pieces including coupons: 19.

The earlier "31 parts" count was not accurate for the current K11 build.

Active Print Batches After Approval

1. Coupons: four fit-test parts.
2. Internals: `femto_mount`, `arducam_mount`, `mic_rail`, `led_diffuser`, `cable_backbone`, `splice_plate`.
3. Shells: four shell halves, one large print per plate.
4. Pod: `pod_top`, `pod_bottom`, `pod_compute_sled`, `pod_vesa_plate`.

Removed Or Legacy For This Build

Do not treat these as mandatory for the current K11/Arducam build:

• `jetson_sled`
• `svpro_L`
• `svpro_R`
• `fan_shroud`
• `thermal_baffle`
• `port_anchors`
• `port_bracket`
• old `bezel` with three round camera holes

They remain in the repo for legacy reference, but they do not match the current hardware direction.

Missing Or Not Yet Finalized

These are the items that should be included or locked before final printing:

1. Display retention and strain relief.

The top monitor is currently represented by a cradle and pass-through. The CAD still needs the real cable exit side, a retention strategy, and strain relief for mini HDMI plus USB-C power/data. Decide whether the monitor is held by screws, clips, VHB tape, or a removable clamp.

2. High-speed USB and power architecture.

The K11 can host the system, but the wiring plan needs to reserve ports and bandwidth for Femto Mega, one or two Arducams, monitor USB-C power, mic array, and any LED controller. If Femto uses USB data, avoid routing it through a weak hub. If Femto uses Ethernet/PoE or 12V DC, that should be reflected in the pod cable exits.

3. Service access.

The pod should expose or make reachable: K11 power button, power input, HDMI/USB service ports, and any Femto DC/Ethernet/sync connectors that remain in use. Right now the design is focused on fit; serviceability still needs a physical check.

CAD update: the pod now includes a rear K11 service window, a matching VESA-plate window, and a right-side service slot for USB/Bluetooth extension access.

4. Fastener and insert BOM.

The print files need a matching hardware kit: M3 heat-set inserts and screws for shells/pod, Arducam case screws once pitch is verified, a 1/4-20 Femto screw once the bottom thread location is verified, VESA screws, rubber feet/grommets, and cable-tie or clamp hardware.

5. Thermal validation.

Femto Mega's stated operating temperature range is narrow, and the K11 adds heat inside the pod. The current pod has intake/exhaust paths, but the assembled prototype still needs a 30-60 minute powered temperature test before semi-outdoor use or enclosed mounting.

6. Acoustic/visual front finish.

The current CAD includes mic rail and LED diffuser geometry, but the exact microphone, LED strip/ring, diffuser material, and front finish stack are not final in this approval pass.

Approval Gates

Do not print shell halves or pod as final parts until these are checked:

1. Caliper the ZHAOCAILIN monitor case: total width, depth, thickness, and exact mini HDMI/USB-C exit side.
2. Confirm the Arducam metal case screw size and whether the 28 x 28 mm hole pitch is exposed through the case.
3. Caliper the Femto Mega bottom 1/4-20 thread location before relying on the cradle screw hole.
4. Confirm K11 orientation in the pod: ports toward pod rear, bottom fan facing pod intake grille.
5. Open the approval-v2 STLs in OrcaSlicer and verify support/orientation before exporting new 3MF plates.

Femto-specific fit audit: `FEMTO_MEGA_FIT_AUDIT.md`.

Source References

• ZHAOCAILIN display public listing: https://www.ubuy.co.nl/en/product/QVFHC5048-11-3-inch-computer-secondary-screen-ips-lcd-display-cpu-temperature-monitor-with-casing-for-computer-case-temperature-windows-aida64-cpu-gpu-monitor
• Arducam B0478 product/spec page: https://www.arducam.com/arducam-imx586-48mp-motorized-focus-usb-3-0-camera-module-b0478.html