That’s encouraging, I should get around to trying it.
The CO2 lasers most people own (the ‘eBay lasers’) have a spot size of 0.1mm – 0.3mm depending on the lens (and power). They typically ship with a 50mm lens that has a spot of around 0.15mm. So that’s your ‘kerf’ or the isolation around the tracks.
Could always play around with defocussing to vary the line width I suppose.
Tony
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Thursday, 7 January 2016 9:03 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: 3-D printer resist application? (was: Re: [Homebrew_PCBs] Anyone milling PCBs?)
I have used this technique with spray cans of paint, and it works fine. The biggest problem I had was the lines cut were a bit narrow. At the time I had access to a big CNC system with a Q-switched YAG laser, but since I retired that is no longer the case.
Bob