Stage 8: Validate and Make the Product

Goal#

After this stage you can prove that a design works before you build it, and then build it. You will check a load-bearing feature by hand and with simulation, fit a real circuit board into an enclosure and keep both sides in sync, program a CNC part and post it to G-code, prepare a 3D print package, and release the work with versions. Then you will do it all at once in the capstone: a complete consumer product, brief to files.

This matters because the gap between "looks right in CAD" and "works when made" is where products fail. Validation finds problems when they cost minutes. Manufacturing handoff turns a model into something a printer, a mill or a PCB fabricator can act on. The capstone becomes your portfolio piece.

Licence note: the required tasks use the standard Fusion tools: Design, Electronics, Manufacture (core 2D CAM and post processing) and the 3D Print command. Static stress is covered by the subscription according to the guide, but personal-use availability is not stated in Autodesk's help, so every simulation task has a hand-calculation fallback. Electronics on the personal-use plan has reported limits (commonly 2 schematic sheets, 2 signal layers and about 80 cm2 of board; check Autodesk's current figures), and the capstone board is deliberately small enough to respect them. Anything that needs a paid extension is marked "Optional (extension required)".

Before you start#

• Stage 7 finished: you can render, animate, draw and export.
• You can design a parametric two-part enclosure with a shell, fillets, bosses and a snap-fit or screw closure (see Tutorial 2).
• You can build joints, use Capture Position and run Inspect > Interference.
• You have an Autodesk account hub with a project to save into, and you know where your slicer is installed.

Learn#

• Read Simulation Workspace Overview - the setup, solve, review loop; focus on the "when simulation is worth running" section.
• Read Static Stress Study - the study you will actually use; note the assumptions list and the singularity warning.
• Read Results Interpretation - the five-step order for checking results; focus on reaction forces and the convergence check.
• Read 3D PCB and ECAD-MCAD Sync - Switch > 3D PCB, Insert into Current Design, and the Out-Of-Date round trip.
• Read Manufacturing Outputs - Gerber, drill, BOM and pick-and-place; focus on the CAM Preview step.
• Read Setups and Stock - every toolpath depends on this; focus on the Stock tab.
• Read Post Processing and G-code - the NC Program dialog and why posting needs review.
• Read FDM Design Guidelines - the limits table near the end is a design checklist.
• Read The 3D Print Command and Sending to a Slicer - Print Utility versus Export versus Manufacturing.
• Read Versions, Milestones and Lifecycle States - how to mark a release; lifecycle states need Fusion Manage and are optional.

Reference as needed: Loads and Constraints, Face and 2D Contour, 2D Pocket and Adaptive Clearing, Drilling, Toolpath Simulation, WCS and Orientation, Reviews, Markups and Comments, Sharing and Public Links and Electronics Limits in Personal Use.

Practice#

• Do the practice exercise on Static Stress Study.
• Do the practice exercise on Results Interpretation.
• Do the practice exercise on 3D PCB and ECAD-MCAD Sync.
• Do the practice exercise on Manufacturing Outputs.
• Do the practice exercise on Setups and Stock.
• Do the practice exercise on Post Processing and G-code.
• Do the practice exercise on The 3D Print Command and Sending to a Slicer.
• Do the practice exercise on Versions, Milestones and Lifecycle States.

Short drills:

• Drill 1: hand calc first. Model a cantilever bar 3 x 3 mm in section and 20 mm long. For a 5 N tip load and a typical PLA modulus of 3,500 MPa, calculate the bending stress at the root (M/Z with Z = b h^2/6 = 4.5 mm3, so about 22 MPa) and tip deflection (F L^3 / 3 E I with I = 6.75 mm4, so about 0.56 mm). If your plan includes static stress, run it and compare. Deflection should agree within about 10 percent; the root stress will read higher or unstable because of the sharp corner, which is the singularity warning in action.
• Drill 2: reaction check. In any static study, read the total reaction force and confirm it equals the applied load with opposite sign. If it does not, your constraint or load is wrong.
• Drill 3: stock and zero. Make a plate 80 x 40 x 2 mm, create a milling Setup, set the stock 10 mm larger in X and Y, place the WCS origin at a stock corner on the top face, and confirm the Z axis points away from the table.
• Drill 4: mesh round trip. Export a 20 mm cube as 3MF with the 3D Print command (Export type), open it in your slicer and confirm it reads 20 x 20 x 20 mm.
• Drill 5: version trail. Create a version of a design, change a dimension, save, open History and open the older entry. Note the Out-Of-Date icon and what it means.

Checkpoint project#

Part 1: do the tutorial. Complete Tutorial 7: A PCB-Aware Enclosure. You draw a small board in Fusion Electronics, create a 3D PCB, derive its outline into an enclosure and keep both sides in sync through an update round trip. Allow 2 to 3 hours.

Part 2: variation, make-ready package. Using your tutorial enclosure, in about 90 minutes:

• Add one load-bearing feature (a lanyard loop, a screw boss or a cantilever latch) and check it by hand calculation with a typical material, then with a static stress study if available.
• Prepare the enclosure for printing: check wall thickness (typical 1.2 to 2.4 mm for FDM), overhangs, and export a 3MF or binary STL.
• Run Electronics CAM Preview and export the Gerber and drill ZIP.
• Create a version of the design named "Release A" and write a three-line change note.
• Share a view-only link or use comments to ask a friend to review and answer at least one comment.

Deliverables:

• A one-page calculation sheet (formulae, numbers, result, safety factor).
• 3MF or STL, with a slicer screenshot showing correct dimensions.
• Gerber/drill ZIP and BOM CSV.
• Version "Release A" visible in History.
• A short note describing what you would change after reviewing the first print.

Challenges#

Challenge 1: Will the lanyard loop break?#

Brief: A handheld logger has a lanyard loop on one end. The client worries it will snap when someone pulls the device by the strap.

Constraints: Loop is a straight printed bar 3 mm wide x 3 mm thick spanning 8 mm between two posts, loaded at its centre by 40 N (about 4 kg-force, a deliberately harsh pull). Typical PLA: modulus 3,500 MPa, usable stress across layers about 30 MPa (typical; confirm for your filament). Print orientation matters: state it.

Deliverables:

• Hand calculation for the simply supported centre-loaded bar: stress and deflection.
• A static stress study of the same geometry with fixed post faces and 40 N load (if your plan includes it).
• A recommendation: keep, thicken or reorient, with the new number.

Self-check:

• Hand-calc stress is M/Z with M = F L / 4 = 80 N mm and Z = 4.5 mm3, so about 17.8 MPa; safety factor against 30 MPa is about 1.7.
• Hand-calc deflection is about 0.02 mm.
• If simulated, reaction forces sum to 40 N and displacement is maximal at mid-span.
• Your simulation stress is lower than or close to the hand number (the posts are fixed, which is stiffer than simply supported), and you can say why.
• Increasing the bar thickness to 4 mm changes stress by the ratio (3/4)^2 and you can confirm it.

Stretch: Redesign so the load goes through a fillet-blended root, and show the stress peak falls.

Hint: see Static Stress Study and Results Interpretation.

Optional (extension required): Run a Shape Optimization study (Simulation Extension or tokens) on the loop and compare the suggested form with your own.

Challenge 2: Board in the box#

Brief: An electronics designer hands you a 60 x 36 x 1.6 mm board and asks you to guarantee it fits.

Constraints: Four mounting holes of 2.7 mm diameter, 3 mm in from each edge (spacing 54 x 30 mm). Tallest component 6 mm above the board top; USB-C receptacle on a short edge. Enclosure internal cavity 96 x 52 mm, 15 mm high; standoffs 4 mm tall. Required clearances: at least 1.0 mm from any component to any wall or lid, and at least 1.0 mm from the board to the screw bosses. Cutout for the connector 9.5 x 3.6 mm (typical clearance on a 8.94 x 3.26 mm receptacle).

Deliverables:

• A 3D PCB inserted into the enclosure design.
• Standoffs and connector cutout driven from the board outline, not typed independently.
• A clearance table: measured gaps versus required.

Self-check:

• Top of tallest component is at 2 + 4 + 1.6 + 6 = 13.6 mm above the enclosure bottom; the lid underside is at 17 mm; gap 3.4 mm, at least 1.0.
• Inspect > Interference reports no overlap between board, standoffs and enclosure.
• Moving the board 2 mm in the 2D PCB, saving and clicking Out-Of-Date updates the connector cutout position.
• The connector cutout centre height is 9.2 mm above the enclosure bottom (2 + 4 + 1.6 + 1.6).

Stretch: Add a second board layout that rotates the board 180 degrees and show which clearance becomes critical.

Hint: see 3D PCB and ECAD-MCAD Sync and Tutorial 7.

Challenge 3: Machine the faceplate#

Brief: A 2 mm aluminium faceplate will cover the top of the product. A local shop will not quote until you supply a CAM program or the equivalent.

Constraints: 6061 plate, finished 80 x 40 x 2 mm, cut from 90 x 50 x 2 mm stock. A window 30 x 16 mm with 2 mm corner radii centred 10 mm left of plate centre. Two button holes of 6.2 mm diameter at 25 mm right of centre and 8 mm above and below the centreline. Tool 3 mm flat end mill for window and outline, 6.2 mm drill for the holes. Units mm. Use a typical sacrificial board below the part.

Deliverables:

• Milling Setup with stock and WCS, tools chosen from a library, operations for holes, window and outline.
• Simulation pass with no collisions or gouges.
• Posted G-code file and a setup sheet.

Self-check:

• The smallest inside radius on the window is 2.0 mm and the tool radius (1.5 mm) is smaller, so the corners clear.
• Stock is 90 x 50 x 2 mm and the part sits within it with 5 mm of margin on each side.
• The program header is in millimetres, uses a tool change for each distinct tool, and its WCS offset matches the Setup.
• Moving the window 2 mm in the design and regenerating updates the toolpath without rebuilding the operations.

Stretch: Add tabs so the part is held to the stock during the outline cut and explain how you would remove them.

Hint: see Setups and Stock, Face and 2D Contour, Drilling and Post Processing and G-code.

Optional (extension required): Use the Manufacturing Extension's nesting tools to arrange four faceplates on one sheet, and compare material use.

Challenge 4: Print-ready case#

Brief: The case body (open box) and lid will be printed on a desktop FDM printer. Produce files that print first time.

Constraints: Case 100 x 56 x 20 mm, 2.0 mm walls and floor, 3 mm lid, corner screw bosses 6 mm in diameter, heat-set inserts per the manufacturer's hole size. USB-C cutout 9.5 x 3.6 mm (bridge span within the typical 10 mm limit). 0.4 mm nozzle. Lid screw clearance holes 2.7 to 2.9 mm. Base printed open side up; lid printed top up (recess opens upward, so no support is needed).

Deliverables:

• Base and lid as separate meshes (3MF or binary STL).
• Orientation and support notes.
• Slicer screenshot showing estimated time and supports.

Self-check:

• Section Analysis reads the wall at 2.0 mm, inside the typical 1.2 to 2.4 mm range.
• No unsupported overhang beyond about 45 degrees except the connector cutout, which you have checked.
• Imported mesh is 100 x 56 x 17 mm (base) and 100 x 56 x 3 mm (lid).
• Modelled solid mass of base plus lid in PLA (typical density 1.24 g/cm3) is about 45 g; yours must be under 50 g.

Stretch: Add a snap-fit lip as an alternative to screws and update the checks.

Hint: see FDM Design Guidelines, Exporting STL and 3MF and Troubleshooting Failed Prints.

CAPSTONE: Design, validate and manufacture a complete consumer product#

Brief#

Product: "Pocket Climate Logger", a palm-sized, USB-C rechargeable temperature and humidity logger with a small display, two buttons and a lanyard loop. It is a plausible product for sale in a small run: printed case, machined aluminium faceplate, custom two-layer board.

Client: a small hardware start-up. They want a buildable design package, not a prototype photograph. You are the sole product designer.

Requirements (all measurable):

All dimensions are typical starting values; where you must change one, record why.

Milestones#

Each milestone has a gate: a check that must pass before you continue. Times are estimates for a learner who has finished the earlier stages.

Total about 29 hours; spread over two to three weeks.

Deliverables#

• Requirements table with a pass/fail result against each line.
• Parametric Fusion design with named components, user parameters and a clean timeline.
• Electronics project: schematic, 2D board, 3D PCB, ERC and DRC reports.
• Validation report (two pages): hand calculation, simulation or fallback, fit and clearance table, mass.
• Print package: case and lid meshes, orientation notes.
• CAM package: faceplate Setup, operations, simulation screenshot, posted G-code, setup sheet.
• PCB package: Gerber/drill ZIP, BOM CSV and pick-and-place file, verified in a Gerber viewer.
• STEP of the full assembly and the faceplate.
• Three colourway renders, one exploded-view animation and a published video.
• Drawing set (at least four sheets): exploded assembly with parts list and balloons, case, lid, faceplate with GD&T (flatness and position).
• Supplier folder named with project and revision, with a text index.
• Design version "Release A" with change note, and a review link or comments thread.

Marking rubric (weighted)#

Total 100. Bands: 90 and above, release-ready; 75 to 89, strong with minor gaps; 60 to 74, competent but a supplier would phone you; below 60, rework a milestone gate.

Portfolio checklist#

• Hero render with a transparent or clean background.
• Exploded animation clip (under 10 seconds) and a still frame from it.
• One-line problem statement and the requirements table.
• Two decisions you changed after validation, with the evidence that drove them.
• Screenshot of the stress or hand-calc result, and what you did about it.
• Board layout screenshot and 3D PCB in the enclosure.
• Toolpath simulation screenshot and a photo of the printed part (if you printed it).
• Drawing set PDF with at least one GD&T sheet.
• Supplier folder listing.
• Retrospective: what took longest, what you would do differently, one risk you did not close.

You have finished this stage when#

• I can check a load-bearing feature by hand and with a static stress study, and explain any difference.
• I can fit a 3D PCB into an enclosure with measured clearances and keep the two in sync.
• I can set up a milling Setup, program 2D operations, simulate and post to G-code.
• I can prepare a mesh for printing and verify it in a slicer.
• I can export board manufacturing files and check them in a viewer.
• I can version and share a design for review.
• I have completed the capstone and scored it against the rubric.

Next stage#

That completes the path. Head back to the learning path to review your progress, or pick any section of the guide to go deeper.