Basically the higher the fan, the better the quality of the part but the worse layer adhesion is. The lower the speed of the fan, the better layer adhesion is (stronger part).
For PLA you want that fan at full speed. Beyond 100%. For ABS you want that fan down to a minimum speed. It depends on the air temp. Ideally you want the air temp up around 80C and then you can have the fan near 100% but this would destroy your printer as the stepper motors can't handle that (55C air temp is about the limit - that's what the Ultimaker air handler uses as it's highest allowed temp I think).
So that's why I suggested the test with the breakable part. Do it with different fan speeds from 0% to 100%. Do a binary search - start with 50% and if part is weak try 25% (else 75%) and if part is strong at 25% then try 37.5% and so on. But you measure adhesion strength by seeing if you can get it to break along layer lines.
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Super_paulie 13
thanks for that Geet, very interesting...
In what we are are trying to do, we need to churn out parts quickly and in ABS, and visual quality is mostly secondary in this case. I have had very good results the last 2 days with my revised settings and as we want to print quick 40/45 seemed the obvious way to go on it and frankly the results were almost bang on so im reluctant to change them now. I have just tried to pull one apart and i basically couldnt. Once spare time is available i will do some more testing but im really very happy with where i am at now.
Cheers gents.
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