Tinkercad Teacher Guide: From Classroom Setup to 3D Printing

Tinkercad is one of the best places for students and teachers to start with 3D design. It is free, web-based, works well on Chromebooks, and is easy for beginners to learn.

This guide walks teachers through:

• Setting up student classrooms

• Understanding the basic design tools

• Creating simple 3D models

• Preparing files for printing

• Exporting designs into ElegooSlicer

1. Why Use Tinkercad?

Tinkercad works especially well in schools because:

• It runs in a web browser

• Students can use it on Chromebooks

• It is easy to learn quickly

• Teachers can organize student accounts in classrooms

• Designs can be exported directly for 3D printing

For most teachers and students, Tinkercad is the easiest way to move from an idea to a printed object.

2. Setting Up a Teacher Account

1. Go to Tinkercad.com.

2. Choose “Join Now.”

3. Select Educator.

4. Create an account using:

   • Google sign in

   • Microsoft sign in

   • Email

Once you log in, choose “Classes” from the left side menu.

3. Creating a Classroom for Students

Tinkercad classrooms let you create student accounts without needing student email addresses.

To Create a Classroom

1. Click “Create new Class.”

2. Give the class a name.

3. Choose a nickname or class code.

4. Save the class.

Tinkercad will generate:

• A classroom code

• Student nicknames

• Student passwords

Students can log in using the class code and their nickname.

Why Teachers Like This

• Students do not need personal email accounts

• Younger students can log in easily

• Teachers can see all student projects in one place

Teacher Tip

Print the class roster with student nicknames and passwords before your first class period. This saves a lot of time.

4. Organizing Student Work

Inside the classroom, teachers can:

• See every student's project

• Rename projects

• Open student work

• Help students if they get stuck

Encourage students to name projects clearly.

Good examples:

• Brady_NameTag

• Ryder_Keychain

• PencilHolder_Period3

Avoid names like:

• Untitled

• My Project

• Cool Thing

Clear names make it much easier to find files later when it is time to print.

5. Understanding the Tinkercad Workspace

When students open a new design, they see:

• The workplane

• The shape menu

• The view cube

• The toolbar

The Workplane

The blue grid is called the workplane.

This is where students build their design.

The grid represents the printer bed.

One of the Most Important Teacher Tips

Resize the workplane to match your printer.

For the Elegoo Centauri Carbon 2, the work area is approximately 256 mm x 256 mm.

Set the Tinkercad workplane close to that size so students design within the limits of the printer.

Even better, make it smaller than the full printer size if you want to print several student projects at once.

Examples:

• Full printer size: 256 mm x 256 mm

• Four student projects on one build plate: create a workplane around 120 mm x 120 mm for each student

• Small beginner projects: use 80 mm x 80 mm

Why this helps:

• Students are less likely to make projects that are too large

• Teachers can fit more projects on the print bed at the same time

• Print times stay reasonable

How to Resize the Workplane

1. Click Edit Grid in the lower-right corner.

2. Change the width and length.

3. Set the units to millimeters.

Always leave the units in millimeters for 3D printing.

6. The Basic Shapes Students Need

Most student projects can be built using just a few shapes:

• Box

• Cylinder

• Sphere

• Roof

• Text

Students drag shapes from the right side onto the workplane.

Box

The box is the most useful shape.

Students can stretch it to create:

• Name tags

• Bases

• Signs

• Containers

Cylinder

Use cylinders for:

• Wheels

• Holes

• Handles

• Rounded objects

Text

The Text shape lets students add their name or words.

Teacher Tip:

Text should usually be at least 2 mm thick and raised at least 1 mm above the surface so it prints clearly.

7. Moving, Resizing, and Rotating Objects

Students should learn three basic skills first:

Move

Click and drag a shape.

Use the black arrows to move more precisely.

Resize

Use the white corner boxes.

Tinkercad will show the size in millimeters.

Rotate

Use the curved arrows around the shape.

Most objects should stay flat on the workplane whenever possible.

Why?

Flat objects:

• Print better

• Need fewer supports

• Finish faster

8. Grouping and Combining Shapes

Students can combine multiple shapes into one object.

1. Select two or more shapes.

2. Click Group.

This merges them together.

Examples:

• Put text onto a name tag

• Combine several boxes into a house

• Add wheels to a car

Hole Shapes

Any shape can be turned into a Hole.

Hole shapes subtract material.

Examples:

• Cut a hole in a keychain

• Create a slot or opening

• Carve letters into a sign

To make a hole:

1. Select the shape.

2. Choose Hole.

3. Place it where you want.

4. Group it with the solid object.

This is one of the most important Tinkercad tools.

9. Aligning Objects

The Align tool helps line shapes up perfectly.

1. Select both objects.

2. Click Align.

3. Click the dots showing where you want them lined up.

Teachers should show this early because students often struggle to center text or line up shapes.

Common uses:

• Centering text on a name plate

• Putting a hole exactly in the middle

• Lining up several objects

10. Measuring Accurately With a Digital Caliper

One of the biggest differences between designing for 3D printing and drawing on paper is that the measurements matter.

A digital caliper is one of the most useful tools a teacher can have in the classroom.

A digital caliper lets students measure:

• Length

• Width

• Thickness

• Diameter

• Inside openings

This helps students design objects that actually fit.

Examples:

• Measuring the width of a pencil before designing a pencil holder

• Measuring a phone before making a stand

• Measuring the diameter of a water bottle before designing a cup holder

• Measuring a drawer before designing an organizer

Why Use Millimeters Instead of Inches?

Tinkercad and most 3D printers work best in millimeters.

Millimeters are:

• More precise

• Easier to use for small objects

• The standard unit in nearly all 3D printing software

For example:

• 1 inch = 25.4 mm

• A wall that is 2 mm thick is easier to understand than 0.079 inches

Encourage students to switch the caliper to millimeters and leave Tinkercad set to millimeters.

Teacher Tip

Avoid switching back and forth between inches and millimeters. That is one of the easiest ways for students to make objects the wrong size.

A good classroom rule is:

"Measure in millimeters. Design in millimeters. Print in millimeters."

How to Use a Digital Caliper

1. Turn on the caliper.

2. Press the mm button.

3. Close the jaws and press zero.

4. Place the object between the jaws.

5. Read the measurement.

Common measurements students may need:

• Pencil diameter: about 7-8 mm

• Standard key ring hole: about 5 mm

• Thickness of a phone case: 10-15 mm

• Width of a marker: about 18-20 mm

Designing With a Little Extra Space

Printed objects should usually be designed slightly larger than the thing they need to fit.

Why?

Because 3D prints are not perfect, and a tiny amount of extra space helps things fit more easily.

A good rule is:

• Add 0.5 mm to 1 mm of extra space for objects that need to slide or fit together

Examples:

• If a pencil measures 7 mm wide, make the hole 7.5 or 8 mm

• If a phone is 80 mm wide, make the holder 81 mm wide

This helps avoid prints that are just slightly too tight.

11. Building for 3D Printing Success

Students often design objects that look good on the screen but are hard to print.

Teach these rules:

Keep Designs Flat

Try to keep the largest side on the workplane.

Avoid Floating Parts

Nothing should hang in the air.

If a piece is not touching the workplane or another object, it will not print correctly.

Make Thin Parts Thicker

Very thin pieces often break.

Good classroom rule:

• Walls and thin parts should be at least 2 mm thick

Keep Text Large

Very small letters may not print well.

Use letters that are:

• At least 5-6 mm tall

• At least 1-2 mm thick

11. Suggested First Student Projects

Good first projects include:

• Name tag

• Keychain

• Bookmark

• Pencil topper

• Simple desk organizer

These projects help students learn:

• Shape placement

• Text

• Grouping

• Holes

• Exporting

Avoid complicated projects on day one.

12. Exporting a File From Tinkercad

When the design is complete:

1. Click Export in the upper-right corner.

2. Choose “Everything in Design.”

3. Select STL.

STL is the best file type for most 3D printing.

Important Teacher Reminder

Students cannot slice or send prints directly from Tinkercad.

Tinkercad only creates the design.

The teacher still needs to:

• Open the STL in ElegooSlicer

• Arrange the projects on the build plate

• Choose print settings

• Send the print to the printer

This is actually helpful because it gives the teacher control over:

• Which projects print

• How many print at once

• Print quality and settings

13. Bringing the File Into ElegooSlicer

1. Open ElegooSlicer.

2. Drag the STL file into the slicer.

3. Place it on the build plate.

4. Resize if needed.

5. Slice the file.

6. Send it to the printer.

If printing several student projects together:

• Import multiple STL files

• Arrange them across the build plate

• Leave some space between them

A good rule is to leave at least 10 mm between student projects.

14. Printing Multiple Student Projects at Once

One of the best ways to save time is to print several projects together.

Because you already limited the size in Tinkercad, you can often fit:

• 4 small name tags

• Several keychains

• Multiple bookmarks

on one build plate.

Benefits:

• Less wasted class time

• Fewer trips to the printer

• More students get a finished object faster

Teacher Tip:

When placing multiple projects on the build plate:

• Put each student's project in a different corner

• Label the STL files clearly

• Take a screenshot before printing so you remember which project belongs to which student

15. Troubleshooting Common Student Issues

16. What Teachers Should Focus On First

Students do not need to learn every tool in Tinkercad right away.

For the first lesson, focus on:

1. Dragging in shapes

2. Resizing

3. Adding text

4. Grouping

5. Exporting an STL

That is enough for most students to create a successful first print.

As they become more comfortable, then introduce:

• Hole shapes

• Align

• More complex designs

• Importing SVG files

• Designing functional objects

The goal is not to make students expert designers immediately. The goal is to help them create something that works, prints, and makes them excited to keep designing.