And about using a one nozzle multi extrusion approach, there's one big limitation: temperature. Both materials need to have very similar temperatures. If it wasn't for that, it would definitely be the best option in my opinion.
Having some personal experience with the "multiple tubes into a single nozzle" way of doing things that Prusa is now selling. I wouldn't recommend it. I had a hard time getting to work it somewhat reliable on a single machine with just PLA.
Example of people reporting same issues:
And that's besides the whole "mixing of different materials could be problematic" issue.
XY offset calibration takes 17 minutes if you take instant action when required (oddly specific? we measured), in which it does a print. So that includes heating up the bed and active-leveling.
The AA-BB combination comes factory calibrated right now. The AA-AA not. You really only need to do this once. One of the major things in the development of the printhead was making sure the PrintCores end up at exactly the same point in the head every single insertion.
Not having the XY offset calibrated does not prevent you from printing, however, you will get bad results. So you will get a warning of you try to do this.
You can enter the XY offset values directly in the menu as well, so if you want to use/develop an alternative method, that is possible.
Not directly related to that but somehow related.
It could be nice if after doing a calibration the system doesn't force the cooldown, because if all is 'hot' that also means that it should be ready to print. So it could be nice to avoid the cooling down part, specially the bed, the cores ain't important since UM3 cores do heat really really fast. BUT ofc I know that since the user it's suppose to take out the full glass make sense, but also, after doing it 1-2 times is really easy to just take a look or using a phone to make a photo to see the lines faster.
Also, related to heat/cold. I saw on all versions that if someone preheats the cores, the startup sequence force a cooldown to around 60-90C (can't remember the number exactly). Why is that? I mean, if they are already both hot, where's the need to wait for them to cool? Is to have a more precise first purge? (really just wondering not a rant a all).
Also, calibration. I think it could be better (IMO) if the calibration routine would use the advantage of bridging, to make a more clear lines (thin) by using a bridge between the squares that contain the calibration diagram. It doesn't even need to do two passes to make a small 2 layer bridge, just extrude a 0.4 height for the base and go back to 0.1-0.2 for the calibration lines. Something like:
Edited by Guest
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Having some personal experience with the "multiple tubes into a single nozzle" way of doing things that Prusa is now selling. I wouldn't recommend it. I had a hard time getting to work it somewhat reliable on a single machine with just PLA.
Example of people reporting same issues:
And that's besides the whole "mixing of different materials could be problematic" issue.
XY offset calibration takes 17 minutes if you take instant action when required (oddly specific? we measured), in which it does a print. So that includes heating up the bed and active-leveling.
The AA-BB combination comes factory calibrated right now. The AA-AA not. You really only need to do this once. One of the major things in the development of the printhead was making sure the PrintCores end up at exactly the same point in the head every single insertion.
Not having the XY offset calibrated does not prevent you from printing, however, you will get bad results. So you will get a warning of you try to do this.
You can enter the XY offset values directly in the menu as well, so if you want to use/develop an alternative method, that is possible.
Edited by SandervGLink to post
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