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While PETG is better, yes it is safe to use PLA if you have a silicone sock over the hot-end. So withf these early Hero Me versions, the part cooling ducts are closer to the hot-end. You may want to look at one of my remixes as there have been many many improvements since Kelokera's last September update. https://www.thingiverse.com/mediaman/collections/hero-me-cooling-systems