…do we really need the optical window? apart from keeping away resin from the main window?
That’s a great question!
Strictly, the answer is no. That being said, the optical window is there more for dust than resin, and in that context, you’ll be very glad it’s there. 
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It’s possible that some Form 2 printers run inside Class 100 cleanrooms, and that might be a favorable environment for doing without the dust barrier of the optical window.
…Until the tank window leaks… which eventually WILL occur.
… not yet happened after 3 years
Tomorrow, then…
Wish I could say that… as I just had it happen for the first time.
@billb clearly you haven’t printed with a Form 1 
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As snide remarks go, I’m surprised that FormLabs is so down on the Form 1, especially considering it’s the product that put them on the map.
FWIW, I’ve owned 2 Form 1+ over the last 3 years, and I’ve never had a tank leak. Just goes to show you they don’t make them like they used to.
Oh, I didn’t mean tank leak — I meant dusty optics. The office space here is full of dust, so without the optical window, I had to clean my mirror every few months.
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