Step 1= find an object on thingiverse or build your own –
download by either saving and opening later, or open directly into Blender.
Step 2= clean, re-size, export
Clean your model:
Hit tab to select object mode
Hit A to select all nodes (image appears yellow and purple)
Type W6 to remove all vertices (these are extraneous points)
Resize your model:
Hit N to open the transform properties box. Each unit = 1mm
Increasing the unit number is what the original scale will be multiplied by.
Export:
Export your cleaned and resized model as an .stl
You may need to change the file name in order for it to save properly.
For some more Blender check out these collected tutorials.
Filed under: Blender