Nikon Z 14-24mm lens focus clamp / dew heater

This clamp mechanism is meant to lock the focus on the Nikon Nikkor Z 14-24mm f/2.8 lens, and integrates two polyimide heater strips to prevent dew/frost from collecting on the lens during astrophotography. This is better than the typical dew heater straps for two reasons: 1) The heater strips are put into good contact with the focus ring and front metal part of the lens to better transfer heat to the front lens element, and 2) the focus ring can be locked in place so it isn't accidentally rotated during a time-lapse or an imaging session with multiple exposures.

The clamp is printed from PETG for better heat resistance than PLA, and I did use organic supports in Prusaslicer 2.6 under the overhangs. The hinge uses a 1" 5-40 screw, and the thumbscrew is a 7/8" 10-32. The pockets inside are meant to accommodate two 12mm X 100mm polyimide flexible heater strips:  https://a.co/d/cv0gcV8

The two heaters are around 75 ohms each, and so wired in parallel, they are about 37 ohms, which is close to the heater strap I was using for this lens (which measured 30 ohms). With a 12V dew heater controller at max, this would come out to be just under 4W total power dissipation. I used this Frost King double-sided tape on the top side of the heater strips to install them into the clamp pieces.

Then I routed the wires in the channels, removed the 3M adhesive protection strip and stuck a piece of adhesive copper tape to the inside. This is to help transfer heat and cover over the wires.

The other clamp piece ('front') is where the RCA/phono wire gets installed. I used this particular cable from Amazon: https://a.co/d/fRqXPyk 

I cut it in half and using a drill bit to just slightly open up the hole (for a snug fit) so that I could install it like this:

The strip on this side goes in similarly, but I cut the leads to allow one turn of wire (for thermal relief) so that everything could be soldered together. Polarity doesn't matter, so the two heater strip wires from each side simply get soldered to the positive and negative wires from the RCA cable.

I put a piece of electrical tape over the connections, so that the copper tape wouldn't short them out:

Then the copper tape is placed over, and it's done! Keep in mind that the clamp can't be opened too much, otherwise the wires will pull out of the channels. But it opens enough to be installed on the lens, after the lens hood is removed. Then the lens hood goes on, and the thumbscrew can be snugged up: