grob wrote:What's your theory on why the fan will reduce warping?
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My guess (completely unverified, yet to install a nozzle fan) would be the fan would actually increase warping: the mechanism for warping is that when a layer goes down hot, then cools and contracts, it pulls on the layer underneath and bends it up like a bimetallic strip.
That's the logic I had.
But I thought of it differently now. I might be completely wrong without knowing the physics of this stuff, but thinking of it logically,
Yes, the plastic warps if it cools, but eventually all our prints reach home temperature after done printing. They don't keep warping after you remove them from the print bed, right?
So there's probably some temp range at which the plastic warps.
And maybe if the plastic stays longer in that temp it has more time to warp more?
So if you cool the plastic sooner to go below that range maybe it will have less time to warp so it will warp less?
And if you don't cool the plastic, not only it will have more time to warp, but there will be more hot layers, so more plastic to warp, which will warp together, by pushing each other up and each adding to the force of the top layer, which is worse?
The heated bed I think is to keep the plastic stuck on the bed more than prevent warping? (because eventually it turns off after printing is finished and the object doesn't warp after that?)
I could be wrong on all of these as each can have a different explanation.
Solidoodle 4