Desktop Game Robot
Thought for 45 sec
Recreated and validated the
and documented it in Enclosure Build. It includes a 220 × 180 × 78 mm PETG base, removable lid, display/camera head, 260 × 200 mm play zone, and swept clearances for four MG90S servos.
3D Model (OpenSCAD)
Remaining
- The validated master asset defaults to the body; separate direct-download assets for the lid, head, and preview still need to be persisted.
- Purchased display, servo, camera, and module dimensions require physical verification.
- Further execution is blocked because no ACUs are currently available.
Received notification from "Robot Enclosure Build" that it finished — picking the work back up.
Thought for 2 sec
The executor reports the parameterized PETG enclosure complete, with a 220 × 180 × 78 mm base, removable lid, camera/display head, 260 × 200 mm play zone, and four MG90S swept-clearance volumes. The master OpenSCAD source and Enclosure Build document were previously linked.
Still remaining:
- Persist separate lid, head, and assembly-preview exports.
- Inspect/compile those exports and verify printability.
- Confirm final purchased-module dimensions before printing.
I cannot perform those reconciliation steps now because the account has no available ACUs.
List dimensions to confirm
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Enclosure Build
Overview
This is a compact PETG FDM concept for the module-based Desktop Game Robot. The enclosure uses a weighted ventilated base/body, an independently printable bottom lid, and an independently printable open-back moving head shell. All geometry shares one datum: X left/right, Y positive toward the rear, Z=0 at the tabletop/base underside; robot front is -Y.
Asset
3D Model (OpenSCAD)
The source defaults to
part="body". Set the top-level part parameter to:"body"— weighted base, module supports, buttons, vents, cable entry, neck."lid"— removable bottom lid with screw holes, registration lip, feet and weight-plate aperture."head"— portrait display/camera head shell."preview"— non-printing camera frustum, target play zone, MG90S bodies/cable bends, and all four swept motion envelopes.
Export each printable setting separately. The asset card provides source and generated STL/3MF downloads; the preview setting is a design aid and should not be sliced.
Authored Dimensions — Verified in Source
Table
| Feature | Authored dimension |
|---|---|
| Base/body outside | 220 W × 180 D × 78 H mm |
| Bottom lid | 214.4 W × 174.4 D × 3.2 T mm |
| Registration lip | 2.0 mm high × 1.6 mm wide |
| Head shell outside | 124 W × 52 D × 112 H mm |
| Head position | Y=40 mm; Z=132 to 244 mm |
| Assembled static envelope, excluding arms | 220 W × 180 D × 247 H mm including 3 mm feet |
| Neck | 72 W × 46 D × 58 H mm |
| Nominal walls | 2.4 mm |
| Lid/body fit gap | 0.4 mm |
| Seam gap | 0.35 mm |
| Primary/secondary corner radii | 6.0 / 3.0 mm |
| Four button panel holes | Ø18.4 mm, X=-60/-20/20/60 mm, Y=-56 mm |
| Rear DC entry | Ø12.5 mm at Z=25 mm |
| Rear switch opening | 21 × 14 mm at X=-55 mm, Z=28 mm |
| Strain-relief slot | 18 × 5 mm at X=55 mm, Z=14 mm |
| Vent slots | 20 × 2.4 mm, 6 mm pitch, six per side |
| Closure bosses | Ø9.5 mm with Ø4.2 × 6.5 mm insert bores |
| Lid screw clearance/head recess | Ø3.4 / Ø6.5 × 1.8 mm |
| Closure screw coordinates | X=±94 mm, Y=±74 mm |
| Display window | 56 × 91 mm, centered at Z=184 mm |
| Assumed display pocket | 71 × 111 × 11 mm including clearance |
| Camera lens opening | Ø9 mm |
| Camera lens datum | X=0, Y=10, Z=236 mm; 45° downward |
| Weight/service aperture | 121 × 66 mm nominal through opening in lid |
Purchased-Module Dimensions — Must Be Checked
These dimensions are sources or explicit engineering assumptions, not validated against the eventual purchased hardware.
Table
| Module | Dimension used | Status / action |
|---|---|---|
| Raspberry Pi 5 | 85 × 56 mm PCB; ~Ø2.7 holes on 58 × 49 mm pattern | Official reference drawing; verify cooler, connector, cable and board-revision clearances on the physical assembly. |
| 4-inch portrait DSI display | 70 × 110 × 9 mm module envelope; 52.3 × 87.1 mm nominal active area | Assumed envelope. Measure the selected Waveshare revision, active-area offset, mounting holes, connector direction and flex-cable bend before final head print. |
| Camera Module 3 Standard | 25 × 24 × 11.5 mm; 66° H × 41° V FOV | Official product brief nominal. Verify lens protrusion, focus travel, cable orientation and actual calibration. |
| MG90S | 23 × 12.2 × 29 mm body; 32 × 12.2 × 2.5 mm conservative flange | Nominal generic envelope. Genuine and clone cases/tabs/splines differ; measure all four servos. |
| Regulators, PCA9685 and audio board | Generic rail area rather than fixed hole patterns | Purchase-lock modules, then drill or revise rail/slot geometry. Insulate exposed undersides. |
| Speaker/microphone | No purchase-locked opening | Add grille and acoustic isolation only after the exact speaker and XVF3800 arrangement is measured/tested. |
Camera Tabletop Play Zone
Camera Module 3 Standard is modeled at 236 mm lens height, 100 mm behind the base front edge, aimed 45° downward, using nominal 66° horizontal × 41° vertical FOV.
Table
| Finding | Derived result |
|---|---|
| Full frustum first intersects tabletop | 107.6 mm forward of lens = 7.6 mm in front of base edge |
| Full frustum far tabletop intersection | 517.9 mm forward of lens = 417.9 mm in front of base edge |
| Marked useful zone | 260 W × 200 D mm |
| Marked zone position | Starts 180 mm and ends 380 mm in front of base edge |
| Camera distance to marked near/far edges | 280 / 480 mm |
| Nominal horizontal coverage at marked near edge | 363.7 mm |
| Nominal horizontal coverage at marked far edge | 623.4 mm |
| Width margin around 260 mm target | ~51.8 mm/side near; ~181.7 mm/side far |
The complete target rectangle is inside the nominal geometric frustum. Actual usable recognition coverage will be smaller because of lens distortion, autofocus behavior, object height, occlusion by the robot, lighting and software cropping. Print or tape a 260 × 200 mm calibration mat and validate with the installed camera before freezing head angle.
Servo Clearance and Motion Table
The
preview selection shows four independent swept-volume keepouts plus conservative servo body, horn and cable-bend geometry. The volumes intentionally overlap the shell where mounts must be developed; no decorative skin, cable bundle or fastener may intrude into the final cleared regions.Table
| Joint | Axis datum (X,Y,Z mm) | Authored limit | Keepout basis | Prototype-dependent checks |
|---|---|---|---|---|
| Head pan | (0, 40, 106) | ±45° | Head bounding volume plus 6 mm linkage allowance; Ø36 mm horn radius plus clearance | Confirm pan bracket, hard stops, display/camera cable loop and center-of-mass torque. |
| Head tilt | (48, 40, 150) | ±25° | Head sweep about X axis plus 6 mm allowance | Verify head corners clear neck at both limits and cable loop does not tighten. |
| Left arm | (-101, 4, 105) | 35° down to 55° up | 92 mm arm length swept with 14 mm radius | Verify arm shape, servo spline orientation, shoulder fasteners and tabletop clearance. |
| Right arm | (101, 4, 105) | 35° down to 55° up | 92 mm arm length swept with 14 mm radius | Same checks; mirror only after measuring servo/tab asymmetry. |
Common MG90S allowances: 0.5 mm body fit per modeled envelope, 18 mm horn radius, 6 mm linkage clearance, and 12 mm minimum cable-bend radius. Establish firmware soft limits inside mechanical limits, approach endpoints slowly, and fit hard stops where a linkage could pinch or over-center.
PETG FDM Settings
Suggested starting settings; tune to the printer and filament:
- PETG, dry filament, 0.4 mm nozzle.
- 0.20 mm layers; 0.24 mm first layer.
- 4 perimeters minimum; 5 around insert bosses and servo mounts.
- 5 top/bottom layers; 25–35% gyroid infill in the body/head, 35–45% in the lid.
- Print body upright with open bottom on the build plate; print lid flat; print head with rear opening down or use a brim after slicer overhang review.
- Prefer no supports; enable local/tree supports only under the camera aperture or head details if the slicer flags them.
- Use 5–8 mm brim for the body/head if warping occurs.
- Typical PETG starting range: 235–250°C nozzle, 75–85°C bed, low fan after initial layers; follow filament maker guidance.
- Deburr mating edges. Do not force a tight PETG fit; target 0.3–0.5 mm gaps and lightly sand only after a test coupon.
Hardware BOM
Table
| Qty | Item | Notes |
|---|---|---|
| 4 | M3 heat-set inserts, ~4.0–4.2 mm OD, 5–6 mm long | Match actual insert supplier to Ø4.2 mm authored bore; print a boss coupon first. |
| 4 | M3 × 10 mm socket or button-head screws | Bottom lid; confirm engagement without bottoming. |
| 4 | M3 washers | Optional under lid screw heads. |
| 4 | Ø14 mm adhesive rubber feet or equivalent | Source models Ø14 × 3 mm foot locations. |
| 1 | Steel ballast plate, suggested 125 × 70 × 3–5 mm | Mount on the inside face over the 121 × 66 mm lid aperture using structural VHB plus a secondary retention strap/cover. Round/deburr edges and electrically insulate it. |
| 4 | M2.5 × 6 mm screws | Raspberry Pi mounting; confirm integrated standoff pilot fit and cooler clearance. |
| 4 | MG90S servos with metal horns or reinforced plastic horns | Measure cases, tabs and spline height before printing final brackets. |
| 8–12 | M2/M2.5 servo and linkage fasteners | Final count depends on horn/bracket choice. Use threadlocker only where plastic compatibility is known. |
| 4–8 | M3 inserts/screws for display/head/brackets | Hole pattern remains purchase-revision dependent and must be added/confirmed. |
| 1 | Locking cable gland/grommet for Ø12.5 mm entry | Must grip the actual 12 V cable jacket. |
| 1 | Insulating sheet/cover set | Cover regulator undersides, distribution terminals and ballast plate. |
| As needed | Braided sleeve, cable ties, tie bases, ferrules | Keep moving cables out of all preview envelopes. |
Assembly Order
- Print a wall/fit/insert coupon using the same PETG profile; confirm 0.4 mm fits and insert bore before full prints.
- Print
body,lidandheadseparately. Inspect for layer separation, blocked vents and distorted screw holes. - Heat-set the four lid inserts squarely into the body bosses. Avoid overheating PETG; allow each boss to cool before loading.
- Deburr and insulate the ballast plate. Bond it to the inside face over the lid aperture and add a mechanical retention strap or printed cover before operating the robot upright.
- Install rubber feet and verify the lid sits flat without rocking.
- Mount the Raspberry Pi and module trays on insulating hardware. Keep regulator/distribution terminals covered and preserve the central wire corridor.
- Install the DC gland, master switch and branch wiring. Perform continuity, polarity and rail-voltage checks before fitting compute/display/servos.
- Bench-fit each MG90S and establish neutral positions with the horns removed. Add brackets/linkages, then check the complete mechanical range by hand with power off.
- Measure the purchased display. Revise the head pocket/hole pattern if needed, then mount the display and camera with cable strain relief.
- Route the camera/display flex and servo harnesses with service loops outside every preview keepout. Cycle pan, tilt and both arms slowly while watching for rub/pinch points.
- Close the lid with four M3 screws. Use low hand torque; PETG inserts can spin if overheated or over-tightened.
- Run camera calibration on the marked 260 × 200 mm play mat, then perform the specified thermal, motion, tip-stability and two-hour integrated soak tests.
Fit and Safety QA
- Base/lid seam is uniform; lid can be removed without prying against wiring.
- Every screw has straight driver access and at least ~4 mm useful insert engagement.
- Ballast is positively retained, insulated and does not obstruct service screws.
- Robot cannot tip during worst-case arm/head motion; increase ballast or footprint if necessary.
- No cable enters pan, tilt or arm swept volumes at any commanded angle.
- Display active area is centered in the 56 × 91 mm window; touch edges remain usable.
- Camera lens and autofocus travel clear the Ø9 mm opening throughout tilt travel.
- Pi cooler intake/exhaust and side vents remain unobstructed; validate temperatures under a two-hour load.
- 12 V cable cannot pull on electrical terminals; switch and buttons remain finger-accessible.
- All module dimensions, connector locations, speaker grille needs and mounting holes are rechecked against purchased revisions before the final print.
Sources
Overview
Asset
Authored Dimensions — Verified in Source
Purchased-Module Dimensions — Must Be Checked
Camera Tabletop Play Zone
Servo Clearance and Motion Table
PETG FDM Settings
Hardware BOM
Assembly Order
Fit and Safety QA
Sources
