You can ask for a cancellation anytime while the campaign is live, and can do so on your end through your backer profile.
However, after the end of the campaign, cancellation and refund will no longer be possible. Kickstarter is a platform that allows innovators to offer their creations and ideas at discounted prices. These funds go towards initiating production and launching of the product, resulting in a product that the backer can enjoy. In accordance with Kickstarter Terms of Use we will not offer refunds or return for items that are not defected.
However, in the event that you receive a faulty item, you are welcome to contact us and we will be happy to provide support!