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This 3D alphabet (by Markus, the biochemist behind Digitprop) is a perfect project for the school holidays. You can see more about it, download the files, and find similarly tasty paper projects here.
If you fancy trying your hand at paper engineering you could make a pop-up card. We have put together a selection of simple pop-ups to get you started, with printouts of all the pieces and demonstration videos too. Good luck!