Whenever I print using Bambu Labs Support PLA i get over-extrision / bulging on the layer the support PLA is used on. Its only on the layer the support is on all other layers are perfect.
I have tried everything to counter this and am wondering if there is some trick to get rid of the banding or if this is just the way it is ?
I have 2 x X1C and get this issue on both printers - each with different rolls of Support PLA so its not a filament issue or hardware issue. I ahve all altest firmware and latest sliver software.
I am printing using all default settings on the printer (removed all my customizations) tried swapping wall order / increased my purge area as well as disabled purge inside the object. I have tried also printing hollow as well as with infill.
Any help would be much appreciated - i can share the 3mf if needed but its a custom model so i wold have to delete parts first. There is a thread on this but seems it was solved ? however not for me.
The interface layers will push up your layer time due to the switching. Double check your layer times, and wall speed for discontinuities. I find that cooling fans kicking in higher (those low layer time layers) can change the behavior of laydown vs the layers that have enough time without extra fan.
got it… so what wold your suggestion be ? i mean its like a two color print as i only use a little support filament so should have that much disapity as to affect the entire layer
so should i turn the fan off on the support layers ? is that possible ?
and how do i check my wall speed for disparity ? not sure what you mean there
thanks!!
In the preview summary you can switch to both speed or layer time. Layer time will give you an indication of whether you’re in that zone where the extra cooling kicks in (based off your filament cooling times). The ‘everythings a nail’ method is to reduce your wall speed such that you don’t see any jumps in the speed view, and low enough that it pulls everything out of the short layer time.
As others have said, a prime tower or another sacrificial model can also be used to pull that timing over.
Another thing I just realized… If you’re not seeing speed or fan discontinuities, it may be worthwhile to check the filament purge matrix. Contamination from support material also can do funny things. You may need to up it to 900 just to clear it all.
at this point i will assume using support filament is a total waste of time if it destroys the layers its printed on ? i have now done over 100 prints on 2 printers and everyone turns out the same way
Yeah wow I am not interested in tweaking speed, fan, temp etc for every individual layer. This material just doesn’t work.
