Here's what we want to make first :

We will use Sketchup because it's easy to learn and enough powerful for most usages. If you're confortable with another 2D/3D CAM, feel free to use it and follow along the instructions and dimensions with your own software. But you should give a try to Sketchup someday, it's very fast and efficient to prototype, even in 2D.

  • Download and install Sketchup You can use the free version for this workshop.
  • Start Sketchup using the woodworking - millimeters template.
  • The top bar contains cummons tools you will use. Right-click it to personalize it and add the standard views:
  • Anytime you’re stuck with a tool, check the instructor : window > instructor.


You want a shape that specially fits your phone dimensions. Grab a ruller and get the lenght, height and depth of your device in millimeter (or google it). Keep it next to you, you'll need it.


  • Use the magnifying glass (or type z) to zoom.
  • Use the orbit tool o to manually orient the view. Use it with shift held to pan.
  • You also can automatically zoom to your objects with

To simplify the export, we will draw everything on the ground surface :

  • Go in top view
  • Set parallel projection : Camera > Parallel Projection


Let's start drawing! Use the rectangle tool to create a rectangle with the dimensions : phoneLenght+20 x phoneWidth. My phone is 124mm x 59mm, so I want a 144x59mm rectangle. Don't go far 150x60.
You have to:

  • Grap the rectangle tool
  • Click somewhere and move the mouse is the direction you want
  • Type 124;59
  • press Enter

See the down-right field you type in.

Lens placement

Use guides to position the lenses holes :

  • Grab the ruller tool
  • Click on the horizontal side to initiate a horizontal guide. Place it in the center of a vertical side. Sketchup automatically propose you an anchor for that!
  • Reapeat for the vertical side.
  • From the vertical side, click, mode your mose to the right and type 32 and enter
  • Repeat for the left lens.


You'll draw a circle from the center, with the radius of your lenses plus 1 millimeter for convenience. Your lenses have probalby a diameter of 34mm, fo you should use 18mm for radius

  • Use the circle tool to draw both circles
  • Use the selection tool to grab the inner disk and delate them with Del


We want space for our big nose! Use the tools line, circle, or arc to make a quick shape :


To create the sides, you've to keep in mind :

  • Your phone should be placed 40mm in front of the lenses, and vertically centered.
  • The phone's slot width should be your phone width minus 0.5 or 1mm. It's 7mm for me.
  • We'll make cross assembly. The slots width should be your material thikness minus 1mm. You'll probably use 3 or 4mm cardboard, then make 2 or 3mm slots.
  • Don't make strip less than 5mm wide, they'll break.

You start by drawing a template with the ruller, with the 3mm slot for assembly, 40mm space and 7mm slot for the phone.

Then add some space around

Use the rotate tool q to turn the top and bottom guide. Press alt while you do so to duplicate the guide. This works with the move tool m too! You can use the 15° anchors or type any angle you want.

You can use the line tool l to draw on top of the guides.


Let's make a symetrie for the left side!

  • Double click to select it
  • Right click > Make Component or press g. You just transformed your geometry into a component, which gets those behaviors:
    • Components are separated from any geometry. You can draw across or on top of it while using it as anchor, but your shapes won't blend together.
    • You can make instances of it. Any editing of one instance will affect the other ones.
  • Now duplicate it with the move tool m while holding alt.
  • Then use the scale tool s to flip it. You can type -1 or find the anchor.

You can apply the same trick to your center board:

  • Divide it with a line.
  • Create a component
  • Copy and paste the component in place with Edit > Paste in place
  • Scale it to -1

Double click to enter a component, make the modification and see the other side updating. I used 3mm for the slot width and 5mm around.

Lens holder

You're alsmot done! You only miss some ring to hold the lenses in place. Use the circle tool c and Offset tool f.

Next Stage

Now you're done, and you can pass to the next stage to laser-cut your handset. If later on you want to use sketchup for 3d, here's some tips :

  • Get back to Camera > Perspective, you'll be much more confortable.
  • Abuse of the Push/Pull tool p. It's the core of sketchup.
  • When you move something, press an arrow to lock in one axis. Press again to un-constraint.
  • Almost all tools works the same as you used them in 2D, keep on using them.
  • Always make Component g to avoid messing up your model.