Hopper Upgrade Extension
thingiverse
In OpenSCAD, I customized the Hopper Upgrade STL model and created an extension that allows for stacking to increase the hopper's capacity. To test if it renders using the customizer, I incorporated the original designer's file (drandolph). My OpenSCAD may have a problem generating an STL from that particular file, possibly related to the issue mentioned in this GitHub post: https://github.com/openscad/openscad/issues/191. As soon as I can generate a valid STL output, I plan on printing it.
With this file you will be able to print Hopper Upgrade Extension with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Hopper Upgrade Extension.