dan rosensweigChegg, an online textbook rental company, acquired Flux Software Co./3D3R, according to a Form D filed with the SEC today.

The company, which started out as a textbook rental entity, has exploded into an education conglomerate with it’s hands in course registration, homework help, tutorials and more. Chegg may be focusing on more internal design efforts, however, beefing up its design team with the simultaneous acquisition of software design studio 3D3R.

“Chegg is always striving to offer students the very best tools to save time, save money and get smarter,” said Chegg president and chief executive officer Dan Rosensweig in an e-mail to VentureBeat. “In that spirit, we recently acquired Flux Software Co./3D3R, which is an incredible engineering and design team focused on helping Chegg deliver the dynamic user experience students expect today.”

According to the filing, the deal rung up a little over $1.1 million in common stock.

Flux, as TechCrunch points out, is not associated with the enterprise software company Flux Software. Instead Flux/3D3R is a design team, which may, more specifically, have been brought on for Chegg’s recently announced Facebook application.

“We’ve created apps and experiences for a variety of web platforms, and have an extensive history of developing for the Facebook ecosystem,” reads 3D3R’s website.

Chegg announced its Facebook integration soon after Facebook’s f8 conference in September. The company says it will provide course listings for over 1000 colleges and universities, and allow students to add their own through a Chegg widget.

3D3R was founded in 2005 with offices in both San Francisco and Tel Aviv. It has worked with companies like Yahoo, Nokia and Boxee.