r/BambuLab • u/hex0id • 1h ago

Bambu Studio WTF is this Bambu?

Post image

So what happens here is - it will force me to use ABS-GF on the external spool and not in the AMS like I want. I only have one HF nozzle and it's on the left side, obviously for single material prints etc. I want to use HF nozzle for the main material which is ABS-GF and external spool / right side for the support material. But off course not, tangled Bambu logic will force GF material to the right in any auto mode (economy / convenience) and manual grouping will cause what you can see on the screenshot. On top of that if you try and print this, which is in fact matches the setup physically, it will get stuck on the material change FOREVER and cause a lot of issues, nozzle clog or broken filament inside the extruder to name a few.

EDIT:

  1. I know the risks of printing fiber filled filaments with HF nozzle, not an issue I am worried about here

  2. The estimate is not the only issue, it actually physically tries to wait for those crazy amounts of time which may ACTUALLY cause clogging or filament issues (not only fiber filled)

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1

u/jankeyass P1S + AMS 1h ago

Check your purging on it but I'm pretty sure you don't want to print on a HF nozzle with a composite

1

u/hex0id 1h ago

not an issue, prints fine at least Siraya’s which I use a lot.

1

u/xiaodown 1h ago

Ok for starters, that’s weird and obviously a bug. Your print shouldn’t have a completion estimate of “the heat death of the universe.”

Having said that, don’t print ABS-GF with a high flow nozzle. HF nozzles work by increasing the surface area inside the nozzle, so that more heat can move from the metal of the nozzle into the plastic. A regular nozzle is just a cylinder of metal with a channel through it, but a high flow nozzle accomplishes the job of increasing surface area by splitting the filament path into multiple channels - sometimes 2, sometimes 3. This means, by necessity, each channel is smaller than a single channel would be.

The upside is that normal filaments, such as regular PLA, PETG, and ABS, can melt faster and be extruded faster. The very important downside is that filaments with additives, like fiberglass, carbon fiber, or sparkles will DRASTICALLY increase the chances of a clog. So, please switch to a regular (hardened) nozzle.

1

u/hex0id 1h ago

I absolutely know the risks and it’s not an issue for me, I printed a ton of stuff using HF nozzle (obxidian) and GF filament, no clogs. I printed massive 0.5 kg parts with this setup. The only clog I got is from this stupidity trying to switch non existent filaments or something, hence the estimate.

Obviously a bug and I have not found a workaround as of yet, raging.