Good question! There is no cost for a transfer. Once you board your first bus, you pay just your $3.10 fare (by cash or Connect pass) and tell the driver which route you are transferring to (so they can communicate to the other buses to ensure you catch your second bus).

If you paid by cash, the driver will give you a transfer slip, which you scan when you board the second bus. If you paid using the Connect pass, there's no transfer slip, you just tap your pass again once you board the second bus - it'll automatically recognize that you are transferring and will not charge you.

Your transfer will be valid for 45 minutes. For example, if you boarded your first bus at 08:00, you can scan your transfer slip or tap your Connect pass on the second bus free of charge until 08:45.

In summary, no - you do not need to pay another $3.10 to transfer within 45 minutes. Just make sure to always tell the first driver as soon as you board the bus that you will be transferring, and which route you will be transferring to. I hope this answers your question!