ASA, 0,2mm Nozzle, long prints, HOW?

[EnoTheThracian]

Saw your other thread highlighting your contued troubles.

ASA with 0.2mm nozzle

Dear Babulab Team, I’ve been using an H2D for about a year now (~1,240 printing hours). The machine runs great so far, but there’s one thing I haven’t been able to figure out, and I’d like your help with it. I want to print a few lightweight parts made of ASA using a 0.2mm nozzle, but unfortunately, this usually results in under-extrusion, which causes the extruder motor to overload or the hotend to clog. The parts are quite large, so the print time ranges from 15 to 25 hours. The problem alw…

While I do hope that Bambu comes back to you with a workable solution, there’s this last-ditch approach I mentioned above.

@EnoTheThracian

A completely different approach that was discussed in the forum a couple of years ago was to counter heat creep by providing additional cooling down the filament’s PTFE through a Y-splitter and a small compressor.

I first came across this here:

Extruder cooling strategies?

I’d actually been giving this some thought. I tried doing PLA support on a PETG print and it gave me fits. The PLA would load in a printhead that had been printing PETG, in a build chamber that had been printing PETG, with predictable results. I was thinking I could force air down the tube the filament follows to get to the print head. It wouldn’t be a lot of air, but it would be cool air, and it’d vent right into the area where the filament usually blobs-out and jams the extruder. Something l…

And another quick mention (including product) here:

Heat Creep causing extruder blocks - "FIX"

@user_3026326371 The actual fix will be cool down the extruder but not affecting the chamber temperature. And the best solution I can find is to add an extruder cooler, I picked it up from x2hammer, it channels the air directly into the extruder by using the filament tube and cools the extruder ONLY. It simple solves my issue for good.

I think this is the one.
Extruder Cooler - Pioneer Edition - MartilloTech
A bit on the pricey side though. It’ll probably be much cheaper to get a simple fan, design a shroud to funnel the air into a PTFE and then route it through a dedicated Y-splitter straight to the extruder.

Unfortunately, that is the only case where I have come across this approach to counter heat creep.

&

Addendum: The E3D hotends appear to be better regarding heat creep in those posts above. While there’s no .2 available for the (yet), they also seem to cause a color issue for the nozzle detection.
The diamondbacks are however reported to be superior anyway. Quite pricey though.
DiamondBack HotEnd for Bambu Lab H2D, H2C, H2S & P2S – E3D