Some guy in the desert
Strange i haven't had any issues with cooling or exhaust. But i have a finished shop in the back of my attached garage so i think it keeps the temp pretty moderate.
Well, keep in mind I'm in AZ. Right now here in my back room with the window open it's 79F on January 11th
And ventilation...the room I current have the laser in (my dining room...I haven't had access to my dining room table for over two years since the laser is taking it up) has no windows. Just a big sliding glass door that literally fills the entire wall. The other outside wall is on the other side of the room and would require running the vent hose over the main walkway I use to get to my backyard.
So...both problems are pretty much a worst case situation for me
I actually ordered a fish tank chiller and extra pump this morning to start experimenting with. It's basically a couple of peltier devices with a heat block and heat pipes to some big heat sinks with fans on them. Supposed to be able to keep an 8 gallon fish tank cool so hopefully will be enough to keep my 4 gallons of cooling water chilled. The vent....that will have to wait until I get the laser moved out to my office to solve. Until then I just have to open the sliding door and stick the hose outside...but that leaves a big enough gap that a lot of the smoke and smell still get blown right back inside.
The new lens I put in mine is a 2" for the reasons you outline - basically it's the best compromise between cutting depth (about 1/2") and detail for the kind of things I want to do with mine. But - I had to majorly re-engineer the workbed to get it to the right height for that. (I don't remember what the stock lens on my ultra cheap K40 was...but the stock work bed was junk anyway.) And in fact the workbed I currently have is just temporary since I plan on ditching just about everything except the laser tube and power supply before I'm done (I already ditched the stock electronics for a smoothie board and have a bunch of 2020 and 2040 rail waiting for me to design a new motion platform and case.)
One of these days I look forward to getting a camera setup on mine. Definitely makes them nicer! But I need to get these more basic issues worked out first. But given mine was <$350 off ebay I really have no complaints...I expected before I bought it that the tube and power supply were the only parts I'd keep long term