Laser Cutting with Inkscape: Customizing your Document Properties on Inkscape
You can create your file directly in Inkscape or create it with a CAD software and import it (File -> Import) as either .svg, .dxf, .pdf or a number of other files that Inkscape supports. In this tutorial, we assume you already have a design created or imported.
Inkscape is first and foremost a vector graphics editor, not a CAD tool. You might think that, for this reason, it's not very useful for Laser Cutting. However, Inkscape lets you customize pretty much anything in its interface: units, page size, grid, stroke units, which is convenient when you want to edit a pre-existing design.
1.1. Customizing the Units
The first step is to open up Document Properties (File -> Document Properties). Here in the "General" section for the "Page" tab you'll see that you can set the "Default units". For our purposes, set this to "mm". This will set Inkscape's rulers to use millimetres instead of pixels, which makes checking things and using guides much easier.
1.2. Customizing the Page Size
Generally, it's a good idea during editing to set the page size to the maximum size Sculpteo can laser cut. We will change this later, but for now set the page units to mm and the page itself to a custom size of 940 x 590 mm, as this is the maximum size we can laser cut in one go. In this way we can see if we need to rearrange anything to make sure it fits in the laser cutter. Portrait or landscape is up to you, Sculpteo will adapt to fit your design in the right orientation in production.
1.3. Customizing the Grid
By default the grid is not active, you need to create one, so while still in the Document Properties window, go to the "Grids" tab and create a new Rectangular grid. Set the grid units to "mm" with a spacing equivalent to the Minimum Safe Line Spacing for your chosen material. In our case, 3mm thick MDF, the minimum safe line spacing is 1mm.
We have many other materials options that we don't discuss in this tutorial. To read about them, and to make sure you respect the minimum safe line spacing for the material you've chosen, check our materials catalogue.
Use whatever you prefer for major grid lines. This will let us check minimum spacing.
1.4. Customizing the Stroke Units
Back in your document (close the Document Properties window if it's still open) you'll see in the bottom left of the window two little entries that say "Fill" and "Stroke". Stroke should have a number beside its color, which indicates its thickness (if not, you may have not selected an element - click once on any element in your design that has a stroke or outline). Right click on this number to see a list of available thicknesses and up top a list of available units. Choose "mm" so that our strokes all have their thicknesses measured in mm now. This will let us check any critical elements for kerf effects later on.