The trick is to cool the thermoplastic just enough that it won't sag and fall
over, while remaining melty enough for the next hot layer to fuse to it. Has me
wondering if 3D printers could have an extra bridging fan, a small one with a
precisely aimed nozzle that could quickly turn on when reaching a spot to
bridge then off as the nozzle goes over a previous layer?
That would require additional processing by the printer to identify unsupported
bridging and modifications to the printer software and hardware for the
bridging fan. But if it would work to firm up the first layer across open space
the layers above would benefit from the better support.
On Sunday, February 21, 2021, 2:02:37 PM MST, Frank Tkalcevic
<[email protected]> wrote:
The "nozzle fan" is actually a "part fan", used to cool down some plastics,
especially PLA, that have a low (50c) transition temperature. Cooling the
nozzle, and heat block is bad; that's why they make silicone "socks" to
cover the heat block and nozzle.
You may want to try printing without the part cooling fan coming on for
PETG, as it sounds like those first layers worked well.
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