To save a few bucks, Chinese versions of the Titan Extruder and the Titan Aero Direct Drive Extruder do not come with the thumb screws for tension adjustment on the spring. If you buy our Titan Aero or Titan Extruder we do include the thumb screw. If you bought yours elsewhere, we offer you the thumb screw separately. The thumb screws make adjusting the tension on the spring much easier than the clumsy design that Chinese Titan Extruders & Titan Aeros use. Compatible with e3d Titan Extruders and Titan Aero.
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