Yes, you can. You could sell things such as shirts, gamepasses and Paid Access and earn Robux if people buy them. You can also convert your tickets into Robux.
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You cannot.
If you do not have Builder's Club, the only way to get Robux is to trade tickets in for Robux at the Roblox Exchange. If you do have Builder's club, you can earn Robux by selling cloths and limited edition hats.
You can't without buying them or buying BC.
buy some ROBLOX cards :P
Only 1 way to get free robux on ROBLOX and spent absolute nothing and that is to Trade Currency (Tickets to Robux)