One useful small item is a customizable key tag, big enough that you don't lose or forget important keys.
Given my background with consumer 3D printing, I set out to design an object that would print really fast, and would look nice.
If you want to save time and see the final result: Edit the keychain in 123D Design Online
You can also use the gallery link: http://www.123dapp.com/smb-123D_Design/Keychain/1264529
Step 1: Using 123D Design Online
- It is easy to use - designed from scratch to do simple operations well
- It maintains an object "history", so any feature can be edited later - this allows for customization
- It runs in a browser - no need to install software or keep it updated
- Go to http://www.123dapp.com/
- In the Apps menu, select 123D Design
- If this is the first time you've used 123D Design, you'll be prompted to install a plugin
- You should also create an Autodesk account, or sign on with any of several social networks
Step 2: Adding Geometry and Joining Parts
In this case, add a cylinder, make it 20mm wide and long, and 5mm high. Also add a cube, 20x20x4mm.
You should be able to drag them together, and side of the square will snap to the middle of the cylinder.
Step 3: Joining Parts
Join the parts, and accept the warning dialogue.
Step 4: Making Holes
Now select the part that you want to use as a "tool" to make the hole, and you should see a slider for solid vs. void. Select void, and you have your hole.
Step 5: Making Rounded Edges
To do this, select the fillet tool in the toolbar, then select an edge. In this case we've selected the top edge of the cylinder. Then you can either drag a handle to increase the radius of the fillet, or type in a value directly. (You'll find this to be one of the most satisfying things you can do in this program!)
Step 6: Making the Tag Body and Hollowing It Out
Add another cube, make its dimensions 20x8x4mm. Pretty easy. Drag it next to the rounded tag end, and it should snap together.
We'd like to make a recess in the tag, to make it look prettier and make a frame around the text. This is very easy to do in 123D Design, there is a tool called "hollow", it's the hollow cube-like icon on the top toolbar.
Select it first and then select the top face of the tag body. You can either move a handle to define the width of the shell, or type in a value directly.
If you want to make the recess deeper, you can later use the Push-Pull tool in the toolbar to press down the bottom of the hollow.
Step 7: Adding and Editing Text
A nice feature of 123D Design Online is that text remains editable even when you're done editing the part, so it makes it easy to publish customizable objects (like this one!).
Step 8: Export a Printable File
Enjoy a coffee, or a snack!
Reload the page in your browser, and under the "Save/Download" options you should see an STL file. Download this, and print it according to the instructions for your 3D printer.
Alternatively, you can use the Fabricate menu to get your piece printed using one of the 123D 3D printing partners.