The difference between smallest possible layer height on .2 nozzle and largest possible layer height on .8 nozzle is far less than the distance between the nozzle tip and the bottom of the silicone sock. There’s no physical reason why this cannot be done.
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I’m surprised this needs to be explained to you, but here we are:
A dealbreaker for one person isn’t a dealbreaker for every other person.
Wow! Who would have thought??!
Using two different nozzle sizes on the same print isn’t possible yet, as we know. It might be because of the situation where infill is printed with a larger nozzle and perimeters with a smaller nozzle. That situation requires the nozzle tip to move down sometimes without colliding with the print body. Understandable that it may be difficult to program this into the slicer. However:
With the example of a .8 nozzle + a .2 nozzle:
Can you start by letting us print the body of a print with a flat top with one nozzle size, and then extrusions on top of the printed flat surface with a smaller nozzle?
For example, see this image. It should be no issue to allow us to print the entire black sign body with a .8 nozzle and the extruded orange text in a .2 nozzle, right? I can’t imagine why that would be difficult to program.
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For clarity:
The sign in the above image is large enough not to necessitate such a nozzle change. However, I print a lot of simple little fridge magnets which are simply a flat body that is tall enough to drop a magnet inside of mid print + extruded text or a design on top in a different color. I did a test just now and sliced a bed with 7 magnets on it.
.8 nozzle finishes in about 3 hours.
.2 nozzle with the highest possible layer height is 17 hours! lol
Excellent idea.
Further, shouldn’t be an issue to allow different nozzle sizes for different layers, for example use the smaller nozzle for layers that have shallow angles that accentuate layer lines.
I was using din feature on my cheap Sovol SV04 idex printer in Cura years ago. I always used the printer with a 0.4 and a 0.8 nozzle mixed in the same print. No problems, just detail and speed gains. It is unbelieving that Bambulab can’t do it in the day 0. It looks like they are holding this on purpose.
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Considering their FAQ, I imagine they are waiting for a stable release from the devs working on it. My guess, unless it takes too long, they’ll likely piggyback on what the Prusa team finds to work well and adapt it over to their needs.
Sorry if I missed it referenced somewhere.
Q: Can dual nozzle printing support the simultaneous use of different-sized hotends for printing tasks?
Currently, simultaneous use of different-sized nozzles is not supported. If this feature is added in the future, we will provide information through a firmware update.
They could have fixed the bed issues at the same time. Would have allowed them time to stock the filter needed for the laser too. And the ams ht, rotory tool etc
Bambu Studio already has the technical ability to print two different filaments at different layer heights within the same print project. It just hasn’t been applied for printing different filaments that are used for printing objects. Currently, it can only be applied to filaments used for Support. View the “Support” tab, scroll down, and you will find a checkbox labeled, “Independent support layer height.” And, you can actually view how it does this by slicing a file with that checkbox selected, and then view the sliced file in the “Preview” screen, and using the vertical scrollbar to slowly step through the layers as they are layed down, you can see this difference happening between the two filaments.
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Same, I was hoping you could do that…
Same here. I even ordered 0.2 Nozzle, but today decided to check in the slicer if I can use two different sizes and it says no. I really hope to be fixed soon.
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“For example, see this image. It should be no issue to allow us to print the entire black sign body with a .8 nozzle and the extruded orange text in a .2 nozzle, right? I can’t imagine why that would be difficult to program.”
all i need and for exactly the same reason.
The issue is that they’ve found solutions that work for some geometries and not others. In a recent interview Dr Tao likened it to non-planar printing in it’s difficulty. There’s a lot of edge cases to cover and it’s a very difficult software problem they’ve been working on for a long time (similar to non-planar). He admitted that the H2D is 100% capable of doing it, but they’re still working on building a solution that’s reliable and that can handle the majority of geometries thrown at it. Supports are simple structures that the slicer is in control of, it’s a lot easier to make it work with them than with with a model of arbitrary shape or size
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I’m sure the Bambu engineers know better than me, but since we’re only talking less than a mm of layer height, why couldn’t it be handled with Z retraction?
The issue is likely collisions and overlap with existing geometry due to extrusion differences between nozzles, not just layer height. Not sure how you expect z-hop to solve any of that?
If the nozzle hops over the obstructions, how would it knock the print over?
The nozzle can’t avoid the geometry when it needs to print there. It isn’t travel we’re talking about where Z-hop can avoid the print. Similar to your question about this in regards to grid infill, the nozzle is required to print near or over previous lines, I don’t know every challenge that goes into this because it’s not my field, but a 0.2mm nozzle prints differently than a 0.6 or 0.8mm, at least in terms of line width and flow rates, the infill needs to contact and bond to the outer walls, and I would imagine these differences (and likely more I don’t know of) cause problems. You are probably right that as part of the solution they will need to adjust Z height when printing with a different nozzle, but I don’t think it’s as simple as just moving up to dodge the obstacle
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Fair enough, wouldn’t be the first time then things turn out to be harder than I expect 
I personally have confidence in their engineers. It may take a while, but I’m sure we’ll see it down the line for the H2D
Sorry if im behind, but i think this is coming for sure. They already allow different profile settings for left and right nozzles. line width/height etc