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Key Concepts & Strategies

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Applications

Demo: Modeling in TinkerCAD

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Digi-Fab

A Collection of Tools

Digital fabrication refers to the use of computer-controlled tools and processes to create physical objects from digital designs. It's an umbrella term that encompasses various technologies, including 3D printing, laser cutting, CNC machining, and more

3D Printer

Laser Cutter

Vinyl Cutter / Plotter

CNC Milling Machine

Waterjet Cutter

3D Printing

Why Use it? Why not?

• Enables rapid iteration with precision
• Can create very complex parts that couldn't be created through other means
• Low cost & little waste
• Huge support community

• More software experience needed to 3D model & modify parts
• Generally slower than other fabrication methods
• Post processing may be required

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3D Printing

What Is It?

3D printing is a manufacturing process where a digital model is turned into a physical object by adding material layer by layer. This process is controlled by a computer and commonly uses materials like plastic, metal, or resin to create a wide range of objects, from prototypes and tools to final products.

Key Concepts

Printer Types

3D printers come in several types: FDM extrudes melted plastic; SLA and DLP use UV light to cure resin; SLS and SLM fuse powdered materials with lasers; and and PolyJet uses jets to deposit materials, allowing for high precision and multi-material prints.

Each type is suited for different applications and materials.

Key Concepts

FDM Printers

Cartesian

Delta

Core XY

Conveyor Belt

Key Concepts

FDM Materials

Strategies

Considerations

Build Volume

Support Material

Infill Percentage

Layer Orientation & Resolution

Part Orientation

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Strategies

Building by Layers

Because you are stacking melted plastic on other extruded plastic, 3D printing is like building a sand castle. Your castle shape must stack sand on other sand underneath it.

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Strategies

Building by Layers

If the design you create causes the 3D printer to float melted plastic in the air, without supporting plastic layers underneath it, your print will fail.

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Strategies

Overhangs

A 3D printer can generally print overhang layers to a certain angle (~45°) before the quality of the print begins to be affected.

Newer printers, with more sophisticated cooling systems, such as the Prusa MK4S can print at much steeper overhangs, up to 75° or greater

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Strategies

Support Material

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Supports can later be broken off of the completed print

If the design requires overhangs, supports can be generated by the  3D printer software to hold up the overhanging material.

Strategies

Part Orientation

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Whenever considering using supports, first question if rotating the part

on the print bed would allow a print without supports.

When printing a difficult shape, like a sphere, consider splitting the shape 

into two pieces (two domes) which would allow an easy print with no supports. 

The orientation (rotation) of a print can also affect its quality. Standing this part vertically is a better orientation.

Strategies

Infill and Layer Resolution

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3D prints are not solid. They are an outside wall of plastic with an “infill” pattern that can be set to very empty to very dense.

Similarly, 3D prints can be printed with different layer heights, leading to more refined and smooth surfaces at the cost of time.

Demo: Modeling in TinkerCAD

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3D Printing Pipeline

The 3D printing workflow is a process that starts with a 3D model in a CAD software that is exported to a 3D printer slicers software, which prepares the file for the printer.

CAD Software

Online Database

Slicer Software

3D Print!

CAD Model

Fusion 360

Rhino

Tinkercad

Onshape

Thingiverse

Myminifactory

Printables

GrabCAD

Cura

Prusa Slicer

Simplify 3D

Chitubox

Prusa

Bambu Lab

Creality

Anycubic

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3D Printing

Custom Models vs Downloaded Content

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vs

Thingiverse

Custom Designed Model

What is Tinkercad?

Tinkercad is a fun and easy-to-use computer program that helps you make 3D designs.

Go to tinkercad.com

Make your Account

Click on "Create your first 3D design"

choose a cube to start

change it's size!

add more shapes if you want!

2 MINUTE TINKERCAD BEGINNER TUTORIAL

Tinkercad

Resources

Tinkercad has a variety of built-in resources including a learning center with dozens of step-by-step tutorials and a collection of challenges.

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Tinkercad

In this demo, you will be designing and printing a one of a kind ring! Use the linked Tinkercad file to get started. Each step of the modeling process is outlined within the file. Click on the text bubbles to view the instructions for each step.

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Tinkercad

Join Our Class!

Click Here!

3D Print

3D Export

Click Export

when you are done designing and select STL as your file type

Go back to your 3D Model

3D Printing

Slicer Workflow

3D Printing

• Export your 3d design as STL file

• download 🌐 PrusaSlicer
• Choose i3 MK3S & MK3S+

• import your STL file

Use this tool to move the object

Use this tool to scale the object

Use this tool to rotate the object

Use this tool to place a specific object's face onto the ground.

Use this tool to cut the object

Infill is how much you want the object to be filled from the inside

Choose the printer you are going to print this design on

Supports provide stability and prevent overhangs during the printing process.

Choose how detailed you want your model to be, keep in mind;

more details = more printing time

Finally, Export G-code and copy it to an SD card

By sliding this slider, you can see all the layers of the design

That's it!



Now you can take your SD card to the 3d printer

Insert the SD card into the 3D printer's SD card slot on the left side.

Choose print from SD card

Choose your G-code file

Nozzle temperature

Bed temperature

the process of printing in percentage

File's name

It will start by getting rid of a the plastic in the nozzle

To edit the setting you can go to "Tune"

printing speed

Nozzle temperature

Bes temperature

Fan speed

Material Flow

Now we wait

Applications

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Slip-Cast Ceramic

Zoom Widgets

Molded Bioplastic

Hand Drive for Wheel Chair

Polar Bear Cake

Pressed Paper Pulp

A Few Applications

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MK1

MK3

MK2

MK4

Case Study

Persephone VR Headset

Case Study

Persephone VR Headset

Jade

Thermoplastic polyurethane (TPU)

• Provides flexible and soft 3d prints for increased comfort
• Slightly harder to 3d print at high quality
• Extremely durable
• Used in headset face padding

Case Study

Persephone VR Headset

Ratchet Adjustment

• A ratchet that automatically unlocks through the dial being counter rotated
• Offers extremely simple and fast adjustment
• Significantly more durable than previous solutions

Case Study

Persephone VR Headset

Leverage curiosity of your students!

Make the machines accessible - lower barrier to entry for beginners

Encourage a balance of downloaded content with custom models

Catalog and discuss failures - they will happen!

Set clear guidelines are print-time and material use

Encourage peer to peer training with students

Use 3D printing to support other fabrication workflows

Insights on supporting

3D Printing in your makerspace

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Linkage

Rectangle 60 * 10

2 small cylinders 4 * 4 for holes

2 Half cylinder 10 * 5 for edges

Ball and socket

Great for 360 planar rotations

1. Insert a cylinder

10*10*20 (h)

1. Make another cylinder

3.5 * 3.5 * 20 (h)

؜Add a 7*7*7 sphere

Make a copy of the sphere

Align the sphere at the top of the cyclinder

Make hole the sphere and Union group

Merge both shapes

Gear

Add 1 rectangle with those dimensions, with 2 cylinder on each side, then group.

Height 5 for all shapes

Add those 2 cylinder with those dimensions

Height 10

Height 5

Use the Circular Array Trick

1. ؜Go in "Top" view
2. Select only the cylinder
3. Press Ctrl + D (duplicate)
4. Rotate the duplicate 22.5°
5. Press Ctrl + D repeatedly
6. → You will get a perfect 16-tooth gear.

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Align center

Select all and union group

؜Same Process for the 2 other gears

Gear 2 Dimensions:

1. Rectangle: 20 * 2 * 5 (h)
2. 2 cylinders 6*2 * 5 (h)
3. Big cylinder 20 * 20 * 5
4. Hole Cylinder 5 * 5 * 20 (h)

Gear 3 Dimensions:

1. Rectangle: 15.44 * 3.8 * 5 (h)
2. 2 cylinders 4.56 * 1.67 * 5 (h)
3. Big cylinder 15.38 * 15.38 * 5
4. Hole Cylinder 5 * 5 * 20 (h)

Slider

1. Insert a cube

1. Make the height 5mm and width 60 mm

(click on the square on the sides and change the dimensions)

1. Drag a “Hole” Cylinder

1. Size it to about 5 mm diameter

1. Position it near one short end (use the Align tool later) and raise it so half the hole sits inside the keychain: set its Z (height) to 20 mm so it cuts through.

1. Select both base and cylinder and Group (Ctrl/Cmd+G) to subtract the hole.

1. Drag the Text object onto the workplane.
2. Resize the text in X and Y to fit—play with width until it looks balanced on the keychain.

1. In the Text inspector, type your name. Choose font if available.

1. Embossed text: leave text as Solid, select both text + base → Group to permanently join (this merges geometry so text prints as part of the base).

1. Engraved text: set text to Hole before grouping; select both → Group to subtract and leave an engraved text recess.

1. 3D spatial reasoning
2. Decomposing complex structures into simple forms
3. Creative interpretation of real-world architecture
4. Precision in grouping, aligning, and scaling

Learning Goals

1. Computers with Tinkercad access (mice recommended!)
2. Internet for city research
3. Centimeter grid paper + pencils for sketching
4. Access to 3D printer (optional but ideal)
5. Reference images of landmarks

Materials

1. Sketch

1. Choose a landmark they know or like.

For beginners: start with landmarks that are mostly geometric (e.g., Pyramid, Big Ben).

For advanced students: try curves or lattices (Eiffel Tower, Sydney Opera House).

1. Look up reference images (front, side, top if possible).

1. Draw a quick sketch or shape breakdown — e.g., “The Eiffel Tower = triangles + squares + cylinders.”

2. Build in Tinkercad

Tools & Tips to Teach:

1. Move & Rotate: to align and angle shapes.
2. Group & Ungroup: to combine parts into one structure.
3. Duplicate (Ctrl+D): for repeated features like windows or columns.
4. Align Tool: for perfect symmetry.
5. Hole Tool: to cut out arches, windows, or doorways.

؜3. Prepare for 3D Printing

1. Export as .STL → ready to slice and print.
2. Open a Slicer Program
3. “Import” and select your .stl model.
4. Use Rotate or Lay Flat tools if needed.
5. Adjust the size (Scale) only if necessary — e.g., to fit the print bed.
6. Click Slice: The slicer will generate the toolpath and show: Estimated time, Material use, and preview layers
7. Save the sliced file (usually .gcode) to:
8. An SD card or USB drive for most printers
9. Insert into the printer and start the print!
10. Watch the first layer — it should stick evenly.

؜Print Settings

1. Infill: 15–25% for most models Supports: Only if there are overhangs > 45°
2. Adhesion: Add a brim or raft if the object has a small base

؜4. Print + Reflect

1. It should take around 2 hours! Once it's done take a cool shot of your project!

In this activity, students will research, sketch, and 3D model a city skyline using Tinkercad. Then students will 3D print their designs to display and take home. Curricular connections can also be made easily to geography, geometry, scaling/measurement, and informative writing.

1. Identify geometric shapes that compose real buildings.
2. Learn to model efficiently in Tinkercad using grouping, scaling, and alignment tools.
3. Practice scale and proportion when converting 2D sketches to 3D.
4. Understand the importance of overhangs, print orientation, and bases in 3D printing.
5. Reflect on the design process — from inspiration to finished product.

Learning Goals

1. Computers with Tinkercad access (mice recommended!)
2. Internet for city research
3. Centimeter grid paper + pencils for sketching
4. Access to 3D printer (optional but ideal)
5. Reference images of city skylines

Materials

1. Explore

Goal: Build visual inspiration and understand skyline composition.

1. Look up skylines from different cities: New York, Riyadh, Tokyo, Paris, Dubai, etc.
2. Discuss: What makes each skyline recognizable? (Height pattern, building shapes, landmarks.)
3. Choose one city — or invent your own futuristic one.
4. Save 1–2 reference photos.

2. Sketch

Goal: Break down buildings into basic geometric forms.

1. On centimeter grid paper, sketch your skyline using 3–5 main buildings.
2. Simplify each structure into cubes, cylinders, pyramids, wedges, etc.
3. Think in scale: each 1 cm square = 10 mm (1 cm = 10 mm).
4. Add a simple ground/base line that connects the buildings.

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؜3. Model in Tinkercad

Goal: Turn 2D sketches into a 3D skyline.

1. Start with a flat base (rectangle about 100 mm wide × 5 mm thick).
2. Build each building using primitives (boxes, cylinders, wedges, roofs).
3. Adjust each building’s height and scale using the white handles or the numeric inspector.
4. Use the Align tool to line up buildings neatly along the base.
5. Use the Group function to merge buildings that belong together.
6. Add text for your city name or your own name using the Text shape.
7. Advanced option: Use Hole shapes to cut windows or roof details.

؜4. Prepare for 3D Printing

Goal: Make sure it prints cleanly and stands up.

1. Check for overhangs — anything not supported underneath may not print well.
2. Rotate the skyline flat onto its back using the rotation arrows if too much overhang.
3. Use the hotkey D to drop the model to the workplane.
4. Add a flat base or wedge under your skyline so it can stand upright after printing.

If the design is not flat on the work plane, one trick you can use is to create a large rectangle with a short height and group the large rectangle as a hole across the bottom of your design. This will flatten the bottom of your design evenly and allow you to drop the design to the work plane and print it flat on its back.

؜4. Prepare for 3D Printing

1. Optionally, engrave your name or the city name on the base.
2. Export as .STL → ready to slice and print.
3. Open a Slicer Program
4. “Import” and select your .stl model.
5. Use Rotate or Lay Flat tools if needed.
6. Adjust the size (Scale) only if necessary — e.g., to fit the print bed.
7. Click Slice: The slicer will generate the toolpath and show: Estimated time, Material use, and preview layers
8. Save the sliced file (usually .gcode) to:
9. An SD card or USB drive for most printers
10. Insert into the printer and start the print!
11. Watch the first layer — it should stick evenly.

؜Print Settings

1. Infill: 15–25% for most models Supports: Only if there are overhangs > 45°
2. Adhesion: Add a brim or raft if the object has a small base

؜5. Print + Reflect

1. After printing, stand the skyline all next to each other upright and display!.