Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.*
Universal V-Jaw Duct Damper Lever
A 110 mm replacement handle for a round-duct balancing damper whose stamped lever has snapped off. The 28 mm hub has a 90° V-jaw that takes any 5–10 mm round or square damper shaft, clamped by an M4 set screw in a heat-set insert. A rib along the top lines up with the damper blade so you can see its setting, and a 4.5 mm tip hole lets a #8 sheet-metal screw lock the setting to the duct.
Doorknob Lever Adapter Clamp
A split-band clamp that grips a standard round door knob (50–56 mm, eleven internal 1.25 mm grip ribs) and adds a 95 mm lever arm so the door opens with a forearm, elbow or closed fist instead of a twisting grip. One M4 bolt through the 4.5 mm clearance ears pulls the 4 mm split shut onto a captured M4 nut; band is 22 mm tall, arm 14 mm thick, overall 139 x 63 mm, and it prints flat with the lever load in the XY plane.