Awesome post and great attention to detail. I'd imagine the cost of materials for 4D printing are one of the main roadblocks preventing this from becoming more common. Rattered hydrogels and thermal photo-reactive polymers don't sound cheap :P
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@tking77798, am so sorry replying late...thank you so much for stopping by. Yeah,I think so too...ive not really done a market survey, and on the other hand, we cant tell the price by the name, it might be very cheap, since people dont use it that much. Thanks