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kcel

Early Priming

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Hi,

 

Using the latest cura (3.5.1), I've noticed an odd problem.

 

I'm printing using Tough PLA with Breakaway.  I'm printing with a raft.

 

What I'm seeing is that the Breakaway filament is primed (good), first layer of raft laid down (good), and then the PLA is primed (still has a couple of layers to go before it would need it) then drags a thread of PLA across the build plate (Tough PLA seems more stringy) so it can go swap back to the Breakaway and complete the raft.  I'm left with a thread of PLA embedded in my raft.   

 

I've even turned on a prime tower and when it primes the Tough PLA it doesn't go near the prime tower to wipe or anything.  So it is priming just for the sake of priming.

 

In this particular case it doesn't really cause a major problem because the raft is, of course, throwaway.  But it is odd behaviour and is not consistent with previous behaviour where it would prime the filament only when it first starts to print with it.

 

Cheers!

 

 

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