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My Rostock v1 arms are pretty loose. They've been used for about 50 total days of printing.

Is there an upgrade/replacement kit to get rid of the slack?

[youtube]http://www.youtube.com/watch?v=nYTje4xUN9w[/youtube]

I used rubber bands on mine. I use a pair for each set of arms, and have them placed right where the truss structure on the arm meets the U.

the rubber bands may help a little bit, but not much since the joints are not spherical rod ends.

The Carbon Fiber Tube Arms from Trick Laser will solve the problem...

http://www.tricklaser.com/Carbon-Fiber- ... M-CFTX.htm