Since Tinkercad is a cloud-based software, sometimes large models causes it to stall. Don’t fret, there are ways around it: on a more complicated model, try splitting it in smaller parts, saving them individually and downloading them. Then Import them back into Tinkercad in a new model. Once you do that, they become ‘flattened’ models (a single entity instead of a bunch of objects grouped together), and should process faster.
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