is it possible to buy Swiss pass flex on-line and just print it at home without any other action?
No, the Swiss Travel Pass Flex can't be printed at home. Several other passes can be printed at home, including the regular Swiss Travel Pass: myswissalps.com/ swisstravelpass/ price.
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Swiss Travel Pass promotion 25% discountOnly if purchased in July 2021. Free cancellation.Buy via the SBB travel centre at https://shop.switzerlandtravelcentre.com or HappyRail at https://www.happyrail.com/swiss-travel-pass.