All of our models are created using Blender, an open source 3D modeling tool, using a custom Emboss Plane plugin. For those familiar with the Blender interface here are step-by-step instructions for making your own models.
EDIT (Dec 18, 2018): Our code does not work with Blender 2.80 (currently in beta), we are working to update our scripts and will have new version ready when 2.80 has a stable release (expected summer 2019).
Step 1: Using real world units
If you have set up your Startup File as outlined in the previous blog post this step has already been done. But as it is important we will cover it again.
scene tab set the
Metric with a scale of
0.001. This makes it so one blender unit is equal to
Step 2: Import the image
Import Images as Planes plugin to add a plane with your grey scale galaxy image as a texture. The keyboard shortcut for this is
SHIFT + A > Mesh > Images as Planes.
Step 3: Set the image size
When selecting an image set the
Height to the value to the size you want, we use 112 mm for our models. Press the
Import Images as Planes button in the upper right of the window after selecting an image. Blender accepts all major image formats.
Step 4: Use Emboss Plane
Edit Mode and click the
Emboss Plane button located at the bottom of the
Step 5: Change settings
Use the settings on the side to control the size and shape of various features.
Faces per unit: the number of polygon faces per unit (1 unit = 1 mm, see step 1)
Emboss thickness: how high “white” is extruded above the plane
Base thickness: how far below “black” the model will extend to turn the plane into a rectangle
Border width: how wide the border around the outside is
External Edge: if you want to avoid using supports when printing you can remove one of the edges
Step 6 (Optional): Smooth out noise
If the resulting model is very spiky (e.g. lots of foreground stars) you can add smoothing to the original image. In the
Textures tab select the
bump texture and in the
Image Sampling section increase the
Step 7: Export as STL
Go back to
Object Mode and export your file
File > Export> Stl.
Step 8: Set export parameters
On the export page set
X up (assuming you set the
Top edge as the external one), and make sure only
Apply Modifiers is checked. Set the name of the file and click the
Export STL button.
Step 9: Slice and print
Import the resulting
.stl file into your favorite slicer program and print the model. The model should be printed “edge on” (as displayed below) for best results.
In out next blog post we will go over using Blender from a command line script.