I needed a simple clamp to hold bird netting in place on a vegetable garden box.

Using OpenSCAD 

• download OpenSCAD  https://openscad.org/downloads.html
• open the  .scad file  
• make any changes you need
• Use F5 to preview the model or via the menu Design/Preview 
• Once you are happy with the model use F6 to Render the model or via the menu Design/Render 
• Use F7 to Export the STL or via the menu File/Export/STL

You can find shortcuts for preview, render and STL on the menu bar 

Customising the Model

• length 
• depth
• width
• opening_width 

The difference between the width and opening_width determines the angle of the clamp sides and the amount of spring.

Printing

• Use Brim
• Draft Mode
• 60% infill
• Consider printing in ASA Filament for outdoor use. ASA is UV stable.