Sawbot

Sawbots are close to spinners because they do have a spinning weapon.

But contrarly to spinners or drums that features bars/discs/tribars, a sawbot's weapon is just (as the name implies) a saw or circular weapon (single component) attached to a motor. Middleweight and heavyweights can have multiple saws.

Sawbots suck in Stock RA2, but they can be very efficient in DSL.

Ninja, BOT-204 (and their DSL counterparts) and Spinner from the West are sawbots, but Ripblade isn't one because it has teeth on a disc, and this in both DSL and Stock.

Sawbots do generally less damage by hit than classical bar/disc spinners and have generally more fragile weapons, but they do continuous damage, have lighter weapons and their weapons can't generally be blocked. Also, if it loses one of it's saws, a sawbot won't wobble like a normal spinner would.

Your sawbot can be either damage-orientated (use classic sawblades or Backlash discs) or strength-orientated (best choice is WhirlWep discs but you can also use chewblade saws). Damage-orientated sawbots are extremely powerful but have vulnerable weapons, and vice versa for strength-orientated ones.

A TWM3R is a good choice for a classic sawblade, but for heavier discs you'd be better with stronger motors, especially that the disc CAN be blocked it it's not perfectly circular (toothed weapon).