I’ve been using mostly Proofgrade Medium Density Draftboard with approximately five hours runtime. There is a noticeable cloudy buildup on the interior surfaces due to smoke/resins. The exterior of the laser tube shows this easily.
I think Maintenance lists 40 hours runtime between lens cleaning. I worry that the laser light might interact with smoke/resins deposits to damage these areas.
But the Glowforge folks have done the testing, so follow the maintenance guidelines.
Question: Can the runtime on a specific GF unit be accessed?
This would be a helpful number to know.