How to 3D print your own keychain

It is fun to walk around with a keychain that you have designed and printed yourself. The good thing is that 3D modeling doesn’t necessarily have to be complicated, you can quickly get started with the free intuitive 3D modeling software TinkerCAD and 3D print slicer tool REALvision online, on Windows, Mac, and basically on any device.

In this guide, I will show you how to create your keychain, and how you prepare it for 3D printing. I will walk you through the complete design process step by step. Let’s get started so you can have your own masterpiece in your hands.

How to design your own keychain with TinkerCad

You can start by signing in or creating an account at TinkerCAD. Before you do this, it can be a good idea to sketch your 3D model simply just with paper and pen, to help you to visualize your 3D object as it might not be easy to think in three dimensions if you don’t have much experience in 3D modeling. 

When this is done, you can move on to TinkerCAD, after logging in, you will find yourself at the dashboard. From here you will be able to see all your earlier creations. Click “create new design” to get started with 3D modeling.

Now you will find yourself in the TinkerCAD workspace. To start making a keychain, you choose the red box to your right. Don’t worry about the color, as your keychain will be the color of your filament

At the top, there is a ruler. Add it next to your box so that you can see the 3D dimensions. The dimensions are shown in mm, so 20 is 2 cm.

You can stretch the box if you want to have it wider, but I have decided to make my keychain a square for this example. In the picture, I have set the height to 4, so it will nearly be half a cm thick.

How to make a hole for your keys to fit​

Next, you would like to make a hole for your keychain. You do this by first adding a solid cylinder in the corner and making the height the same as the box. In the example, the length and the width of the cylinder are 4mm each.

Then add another cylinder in the middle of the first cylinder, but this one needs to be a hole.

Hold down Shift and click on the two cylinders. Then click the group bottom

Now you should see a nice hole inside the cylinder. If yes, then you can group your new cylinder with the box. Maybe you already guessed it, but you have now made the hole for where your keys are going to fit.

If you would like to put your name on top of the box, click the button “Workplane” in the right top corner.

A blue square should appear, and when you place that on your model, the whole workplane should turn yellow. By adding another workplane, you are telling Tinkercad that everything you put on this workplane should be on top of what’s beneath it, enabling you to create something that pops out of your keychain.

To the right, you can choose to put text in the model. My name is Uffe, which is why I choose to put on that.

I have set the text height to 2, so it doesn’t stand out too much. You can also choose to put on other elements. I have decided to put a funny mustache at the bottom to give the keychain another 3D effect. You can also put on hats, eyes, and many other things if you like.

When you are happy with your keychain, click export.

Choose .stl and save it on your computer. The stl. file format is the format that your slicer tool uses when preparing your model for 3D printing.

How to find cool designs on 3D file portals

The fastest way to get a fantastic self-printed keychain is to download a design from one of the many portals offering free 3D models. 

Good portals to start looking at are

1. Thingiverse
2. TinkerCAD Gallery

When you find a model you like, you click download and save it in STL format.

How to slice your 3D keychain

When you have drawn your model or found it on a portal, you will need to prepare it, so your 3D printer can correctly place the layers of filament in the proper order.

This process is called slicing, and you can use the easy-to-use free slicing software REALvision Online to slice your keychain.

When you have made a free account, upload your .stl file and view your keychain as your 3D printer will approach it.

When done, press the red button in the right bottom corner to start the slicing process.

When the slicing is done, you will see an estimated length for your print together with the amount of filament you will need. Hit the red button in the right corner to download the G-code file that your 3D printer can use.

How to 3D print your keychain

Congratulations if you have managed to get so far in your product development process. Now you know how to use basic 3D design software. The least challenging part of making your own keychain is printing it, as the printer does all the work once you first have stated it.

Put your G-code on an SD card or a USB drive to get your printer started, depending on which printer you have.

This time I have decided to use a Creality Ender 3v2 printer to keep it simple.

To start the print, you:

1. Insert the SD-card/USB stick in the printer 
2. Find your file on the display
3. Check that you have enough filament before printing 
4. Click print

How did the printing go?

The first print I made was my own creation of a keychain. It went out well and took only about 15 min. I would like to make the edges more curved, so that is for my next print. I would also like to paint the name and the beard, so it is not grey in grey.

As a huge Minecraft fan, I was ecstatic when I saw that the user GASmakerspace had made models of the tools from the game available on Thingiverse, so I also printed them. Here’s a picture with the ax, and as you can see, this print also went well, so now I have plenty of keychains to choose from.

Now it is time to 3D print your own keychain

I hope you now have a good feeling about how to 3D print your own keychain. Probably you have already started? Either way, I wish you fun while you print.

Remember you can use REALvision Online to slice your keychain for free. Just click the “Start slicing” button in the bottom corner of this page.

Good to know – General terms related to 3D printing