3D Printing a Gaming Accessory Holder

Hello! Welcome back.

In our last lesson, you did an excellent job designing and modeling a custom phone stand with a print-in-place hinge. That project was a deep dive into creating functional moving parts and managing the precise clearances required to make them work.

Today, we'll continue with our practical projects, but we'll shift the focus from mechanical movement to custom ergonomics and form-fitting design. The learning outcome for this lesson is to design and print a functional holder for a gaming accessory (e.g., controller, headset). This is a perfect project to practice measuring a real-world object and building a 3D model around it—a core skill for creating the custom replacement parts and accessories you're interested in.

We will move from closely following a tutorial to a more independent design process. I'll provide you with a case study and a structured workflow, but the final design will be entirely your own, tailored to an accessory you choose.

1. The Workflow: A Case Study of a Headphone Hook

Before starting your own design, it's helpful to see a complete, successful project from start to finish. The following guide from Instructables details the creation of a simple, effective headphone hook. It serves as an excellent case study for the entire process, from initial sketch to final print.

3D Printed Headphone Hook : 11 Steps (with Pictures)

Please read through the following Instructables guide, '3D Printed Headphone Hook'. Don't worry about building it in Fusion 360 just yet. Your goal is to understand the author's workflow and design choices.

Read Steps 1 through 6. Focus on the sequence of operations: Step 1: Initial Sketch: How the basic 2D profile is created and dimensioned. Step 2: Extrusion: Turning the 2D sketch into a 3D body. Step 3: Fillets: Why and where fillets are used to refine the shape. Step 4: Cutting a Hole: How a new sketch on an existing face is used to remove material. Step 5: Adding Screw Holes: How mounting features are designed. This sequence—sketch, extrude, refine, add features—is a fundamental pattern in CAD modeling.

2. Planning Your Custom Design

Now that you've seen an example, it's time to plan your own project. This planning phase is the most critical part of custom design.

Task 1: Choose Your Accessory

First, select a gaming accessory from your desk that needs a home. This could be:

A gaming headset
An Xbox or PlayStation controller
A Nintendo Switch Pro Controller
Any other device you want to create a holder for.

Task 2: Measure and Analyze

With your object chosen, you need to capture its critical dimensions. Your mechanical engineering background will be useful here; think about what measurements define the surfaces your holder will interact with.

The following guide from Adafruit provides a concise overview of this process.

Designing | 3D Printed Accessories for Headphones

This guide from Adafruit, though simple, outlines the essential first steps of any custom design project: measuring the target object and using those measurements to inform your CAD model.

Read the first two sections, 'Measure with Flex Tape' and 'Measure with Calipers'. While you likely won't need a flex tape for a rigid controller, the principle is the same. Use your calipers to measure: The width of the part that will sit in the holder (e.g., the controller's grip, the headset's headband). The thickness/depth of that same part. Any other features you need to design around (e.g., triggers on a controller, buttons on a headset).

Once you have your measurements, take a moment to sketch your design idea on paper. It doesn’t need to be perfect. A simple 2D side-profile view is often enough to translate your idea into Fusion 360.

3. Modeling Your Accessory Holder in Fusion 360

With your plan, measurements, and sketch in hand, you're ready to start modeling. Follow the general workflow from the Instructables case study, but adapt it to your own design.

Step 3.1: Create the Main Profile Sketch

Start a new sketch in Fusion 360.
Draw the primary 2D profile of your holder based on your paper sketch and measurements.
Use constraints and dimensions to make the sketch fully constrained. This is crucial for a stable design. Remember to add a small amount of clearance (e.g., 0.5mm to 1mm) to your measurements to ensure the accessory fits comfortably without being too loose.

Step 3.2: Extrude the Profile

Finish the sketch and use the Extrude tool to give your holder its width.
Consider the overall stability. A wider holder will be more stable but use more material.

Step 3.3: Refine the Shape

Use the Fillet (F) and Chamfer (Modify > Chamfer) tools on the edges.
- Fillets on load-bearing inside corners can increase part strength.
- Fillets on outside edges make the part more comfortable to handle and visually appealing.
- Chamfers on bottom edges that will sit on the print bed can help reduce "elephant's foot" (the slight flare on the first few layers) and make removal easier.

Step 3.4: Add Mounting Features

How will you attach your holder?

For Screws: Create a new sketch on the mounting surface. Use the Hole tool to create countersunk or counterbored holes for screw heads. This is a more robust and professional method than just extruding a circular cut. Refer back to "Step 5: Adding Screw Holes" in the Instructables guide for an example.
For Adhesive Tape: Ensure you have a large, flat surface on the back of the holder to maximize the contact area for the tape. No extra modeling is needed, but it's a design consideration from the start.

4. Designing for Printability

Before you finalize your design, think about how it will be 3D printed. Print orientation is one of the most important factors in DfAM.

Which face will be on the print bed?
Will any parts of your model require support structures?

Fusion 360 Additive Workspace with Support Structures — An example showing how steep overhangs on a model (like the curved part of this hook) require support structures (the blue lattice) to be printed successfully. Orienting your part wisely can minimize or even eliminate the need for supports.

Try to orient your design in a way that minimizes overhangs. The headphone hook from the Instructables guide is a great example. By printing it on its side, the main C-shape is built up vertically, and no supports are needed for the hook itself. If it were printed upright, the entire horizontal section of the hook would need to be supported from the build plate, wasting material and leaving a rougher surface finish.

5. Exporting for Printing

Once you are satisfied with your model, the final step in Fusion 360 is to export it for your slicer.

In the Browser tree, find your solid body.
Right-click the body and select Save as Mesh.
Ensure the format is set to 3MF (preferred for Bambu printers) or STL.
Set the Unit Type to Millimeter.
Click OK and save the file.

You now have a file ready to be brought into Bambu Studio for slicing and printing.

Conclusion

Excellent work! You have just completed the entire workflow for creating a custom-fit functional part. You went from identifying a need, to measuring a physical object, planning a solution, modeling it parametrically, and considering the manufacturing process (DfAM). This is the essence of practical mechanical design for 3D printing.

Key Takeaways:

A structured workflow (Plan -> Measure -> Sketch -> Model -> Refine) is key to successful custom design.
Taking accurate measurements with calipers is the foundation of creating parts that fit perfectly.
Adding clearance to your dimensions is necessary to account for printer tolerances and ensure a good fit.
Tools like Fillet, Chamfer, and Hole are used to refine a basic shape into a strong, functional, and printable final product.
Print orientation should be considered during the design phase to minimize supports and improve print quality.

In the next lesson, we will continue with practical projects by designing a small storage organizer with interlocking compartments. This will build on today's lesson by having you design multiple parts that need to fit together precisely.

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