I've put the word etching in quotations as the method to get conductive tracks on a glass or plastic film might not involve a subtractive approach as with traditional PCBs of applying a conductive layer (such as ITO in this case) and then removing the unneeded part, but rather an additive approach such as printing or drawing the tracks on a transfer medium sheet and somehow transferring it to the glass or plastic (such as PET) film, etc. later, or printing/drawing directly on the glass or plastic film somehow.
Need two transparent conductors in an arrangment like this on a transparent plastic film. Such as ITO on PET. But it doesn't have to be ITO necessarily.
Of course for others it can be anything else.
The thing is there are too many tracks and their size and their gaps are going to be sub milimeter, so hand drawing is out of the question. AdaFruit has a video on using conductive ink but they draw it by hand.
What can/should one use for the transparent conductive "ink" and the film and what should one use to get their drawing from a digital file onto real film/glass?
Perhaps a modified laserjet or inkjet printer, or a modified mini CNC?
I'll probably need to run dozens or maybe hundreds of tests with different widths, gaps and arrangments, so can't really afford to pay a company to do this. Besides, for many DIY is a reason in and of itself.
(Will be running few milliamps and about 8 VDC. Size of the whole film is going to be 10 cm x 5 cm max, playing with liquid crystals)