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: 30% discountAvailable until 31 October 2022. Book 6 months ahead.https://shop.switzerlandtravelcentre.com/swisstravelpass