Controlling tension of a media during printing

A printer comprising

• a dancer bar;
• a first dancer arm coupled to the dancer bar at a first end and movable about a first pivot;
• and
• a first adjuster coupled to the first dancer arm to apply a first setting force to the first dancer arm to set a net moment acting on the first dancer arm and to adjust the first setting force to alter the net moment acting on the first dancer arm.

A non-transitory machine-readable storage medium encoded with instructions executable by a processor and comprising instructions to:

• apply a first setting force to a first dancer arm to set a net moment acting on the first dancer arm;
• and
• detect a characteristic of a media in a printer, the media being tensioned by a dancer bar coupled at a first end to the first dancer arm which moves about a first pivot, tension being provided by a net moment acting on the first dancer arm;
• adjusting the first setting force to alter the net moment acting on the first dancer arm based upon the detected characteristic.