# Make a Decorative Christmas Tree Ornament (with Scratch ; 3D Printed)

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## Introduction: Make a Decorative Christmas Tree Ornament (with Scratch ; 3D Printed)

Summary : Use SCRATCH and its pen to draw a geometrical shape. Export the drawing. Print it in 3D.

Snowflakes made with my 12-year-old students, easily adaptable to a higher level (with fractals by example).

I had this idea to introduce my beginner students to modeling (with math) for 3D printing. They were happy!

It's my first instructable ; English isn’t my first language, so please excuse any mistakes... Merci 🇫🇷 !

## Step 1: ​Decompose the Problem Into Simpler Sub-problems.

Launch Scratch. Using the block pen down (in the pen extension), start by drawing one branch.

This branch, repeated 6 times, gives the whole snowflake.

If needed : The Scratch file is available here (official scratch website).

Then, when the dimensions and the pen size are chosen, hide the sprite and take a screenshot of the Scratch stage. Save the picture.

## Step 2: Print the Image, Giving It Some Thickness, With a 3D Printer.

It's necessary to give thickness to the image.

Two solutions :

• With CURA (or other slicer), open the image file and choose the right dimensions in the window "Convert Image...".
⚠️ Caution : the "base" must be 0.

Print your own snowflake ! Idea : use a Glow in The Dark Filament 😉.

## Step 3: Decorate Your Christmas Tree !

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## 5 Comments

Another example : Koch snowflake. Same method.

Love the approach to 3D design via Scratch! Great project, thank you for sharing!

Thank you.
It's easy to implement with young people.