I reduced the amount of noise the printer transfers to the table, as the table was acting as a loud speaker amplifying all noises. The result was very good with noticeable improvement and with the printer sounding smoother, as if I've had lubricated it. One problem of using foam is that the printer bends to the heavier side requiring an extra conic piece of foam, as you can see on the right.
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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 al