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Showing posts from February, 2018

Composite material stress test: PET-G + Polyurethane foam

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I found people doing lightweight and strong structures with very thin walls filled with expanding foam. See this post. I'm using a cylinder printed in black PETG with 0.4mm walls printed at 245C, 80mm of external diameter, 60mm internal diameter and 50mm height. The volume between the cylinders is approximately 93 ml, and each piece weights 14g~15g before adding foam.

0% infill with simple 0.4mm walls
Each piece weights between 14g and 15g before adding the foam.
The references I found online are for using professional polyurethane expanding foam made by combining two liquids. These are great for many reasons, one being that you can calculate the amount of foam to fill your pieces. I wanted to try polyurethane expanding foam found on the supermarket.
I highly recommend using protection glasses and gloves. These are cheap and can be of great help when handling the messiness of these foams. Latex gloves are not a good choice as the cleaner dissolves the latex. I also suggest you to …