Audiophile Sound Diffusors

What is a diffusor ?
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If you have an room with unpleasing audio properties, one possibly reasons can be echos that occur in a structured way. Early echos (e.g. 25 prints).

Cost Analysis
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I found one offer where 6 pieces of 0.6*0.6 mm diffusor cost 370 E. Thats 170 E per square meter.
If you 3d print it with the octagonal structure, you will need 5kg of filament per square meter. Thats in a similar price regime. If you print for material costs. Also, you need to print for 16