Asking teacher for multiple recommendations?

I’m applying for a volunteer position and I’m thinking of asking one of my teachers to fill out the recommendation form for me, but I’ve already asked him to fill out a different form just a couple weeks ago. Would it be rude to ask him for a rec again?

He already has a letter ready probably. So it is easy enough for him to print others. There is no need for him to use the various forms places may provide.