When I was testing this machine, this was an issue which became apparent once the knobs were exposed to isopropyl alcohol. A friend of mine got the same machine recently and had the same problem, so itβs still an issue with this model as far as I can tell.
What types of plastics βmeltβ in isopropanol?
I thought it was basically inert for everything and just a good cleaner without the issues of using water.
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Acrylic can melt in alcohol for one. but alcohol can ruin a lot of things it used to be widely used for camera lenses and later sensor cleaning in digitals but some of the new coatings can be easily damaged by it. her was
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As I understand it, isopropanol is a basic cleaner for LCD 3D printers.
So, isnβt it Dumb (big βDβ dumb) to make an LCD 3D printer with parts that can be damaged/melted by isopropanol?
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Yes, definitely a dumb mistake. Looks like they failed to acknowledge it and kept making this mistake too
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Yup. I wounder if itβs just that model, though. I just got my photon ultra, so I guess Iβll be doing the dunk test to see if it also needs addressing. Likewise, Iβm hoping that it stays reasonably intact, since itβs a royal pain to pry the material off to re-use the bolt.
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THanks for sharing. Mine did not melt yet but I feel they are always sticky and just wash them more with IPAβ¦ Getting it worst if youβre right! 
I guess Iβll need your models it a near futur thenβ¦ thanks!
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Hi @Frebou
Welcome to the forum, Glad you found us, Let us know how you make out with the knobs,
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good job on the video.
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I made the same mistakeβ¦ so ya. The file is designed to work with the pre-existing bolts, so just let me know if you end up needing a different size, and Iβll include it as a free update.