How to Make Hollow 3D Prints

I’ve been designing hollow 3D prints the hard way.

I use OpenSCAD to design a lot of my projects for 3D Printing.

This time I was designing a nozzle for my Kobalt 24v High Volume Air Inflator.

I wanted it to be hollow.

First, I designed the object as a solid shape. Here’s the original design in OpenSCAD.

Kobalt Inflator Adapter Funnel Shaped Solid 3D Shape

Normaly, I’d design another, smaller shape, and cut it out of the.

You’ll have to calculate and plan the inside diameter (ID). My 3D printer has a 0.4mm nozzle and each wall is 0.4mm while each layer is 0.2mm. So, 3 layers is a 1.2mm wall (on each side). So, if I want a 10mm ID then I need to add 1.2mm for each side, making the size 12.4mm.

I did a wall count of 3 while setting top count, bottom count, and infill all to zero.