This is the third UGEARS I've bought and they don't disappoint. The mechanical models are well designed, especially the intricate gears to make everything work together. The only reason I gave it 4 stars is because, as the previous reviewer said, some of the parts are fragile and you have to be very careful, and due to the materials, the mechanics don't always work properly. However, as this is the third other UGEARS I've bought and built, learn from the previous ones and figure out what needs to be done to make the gears run smoother. Overall I find the models entertaining and at times challenging and plan to purchase more in the future.
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