So here it Goes.
I use pla as support for petg. In settings, both profile are set as basic petg.
As you can see on video provided on link, x1c purges some material, then lowers temp from 255 to 220, wipes nozle. After that ups temp to 255, and goes to purge tower.
But real problem is layer separation. You can remove supports with ease, but print is fragile and layers separate on model. 2 weeks ago, used this metod and everything was fine, and filament is dryed.
Tryed difrent filaments, stock settings etc… anyone else encoutered this? Is it normal for purging to drop temp?
When you use a dedicated support filament, which is specifically designed so that it doesn’t stick to the primary filament, mixing occurs in the hot end when switching from one to the other. It doesn’t just go from extruding one filament to suddenly extruding the other. The hot end has to be purged. And to be really sure you’ve gotten all the support filament out when switching back to the primary filament, the purge volumes have to be very high. I print PETG with PLA for support and use 1000 for purge when switching back to PETG.
Your problem has nothing to do with temperature (what you describe is in fact the correct behavior. It lowers temp before the wipe so filament doesn’t ooze out after the wipe). It is 100% to do with insufficient purge volumes.
If it was just a color change, you might not notice an incomplete purge. But if it’s a “non compatible” (from a stickiness standpoint) filament for support, even small amounts of the support filament still inside the extruder will seriously weaken the layer that’s printed while the extruder is completing its transition to the primary filament.
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