RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
lol. It's user error, of course.
Notice it says phase stepping was the reason....
I still think your issue is bed adhesion, not anything to do with firmware.
RE:
Prusa XL 2TH factory assembled received at beginning of 2025.
As soon as 6.4.0 was released I updated from 6.2.6 and recalibrated both phase stepping and input shaping.
The only noticeable aspect I noticed was increased noise during printing. A sort of resonance whose origin was difficult to pinpoint. This resonance decreased by reducing the printing speed with the knob on the display while the printer was working.
Honestly I hadn't thought at all about attributing that annoying noise to a possible software cause. It seemed much more like a mechanical noise; something similar to a lack of cleaning/lubrication (things that I also did...).
I should point out that I am used to printing functional objects in PETG, PCTG, and TPU, using PLA as a support interface. I calibrate the temperature, flow, MVS, and PA of each material/color because I need precision. I also store and print all filaments inside Polydryer containers. In most cases, I print with the dehumidifier running.
That noise was really annoying.
Following Prusa announce, this morning, I rolled back from 6.4.0 to 6.2.6 and recalibrated the phase stepper and input shaper.
Like magic, my XL is now as quiet as a predator 😊
I really hope Prusa is not going to put all its energy into the Core series, and completely neglect the XL.
Unfortunately, I don't see any exciting developments in this regard. I wanted to make the financial effort to purchase the upgrade from 2 to 5 heads (actually 3 TH would be perfect to me), but given this feeling of apparent abandonment, I think I'll stay where I am, at least until something changes.
RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
@Mauro, you just explained what kills company: sell the top-end product for a premium price (the XL), then come with a new product (the Core one) and screw up your top customers !
Like you, I bought the XL (5 head upfront) thinking Prusa was the best printer company, for the product and support.
This is gone, and I think I will go for any Chinese brand for 1/10th of the price, and if they screw on me, buying a new one will still be less expensive.
I understand that a lot of people are having different issues with 6.4.0, it's not straightforward to debug... but when so many people have problems, the reaction should not be delayed by a month or so. We're talking on the most expensive product of the line... and I personally feel terribly neglected.
Did Prusa reached it's end as a responsible, cool (and open) company ?
Just as a recap my own issues that I never had before 6.4.0:
- "your gcode is not compatible" after forcing to use input shaper
- filament clogged errors after retraction, even after a "purge head"
- many bed levelling probing issues, which are solved by restarting the printer
- double or triple bed levelling delays, probing in round or square patterns
- arm initialization danse is erratic, collide on the wall, miss steps and initialize in loop for minutes
Going to downgrade and wait for a better future...
RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
I think you're being a bit harsh; I don't really see what more you want from this printer. When you compare the features/firmware since 2023, there's no comparison. There have been many updates and improvements. Even recently, version 6.4 will be fixed and will bring its own set of updates. The multicolor and multi-material capabilities are unmatched by the XL due to its print volume. And of course, that comes at a price; there's a significant difference between a 360x360x360 print and a 250x220x270 print of the Core One and INDX! The volume alone imposes constraints that other, smaller printers don't have. So, if you're into small, multicolor figurines, then you're definitely a Core One customer, but not an XL customer, in my opinion. Therefore, I don't see how the Core One is ruining XL users. It's also one of the only printers that can handle different nozzle diameters in the same print. Many people don't know how to use it, but by following the Prusa XL tutorial, everything is explained very well and it has a number of advantages.Its power consumption remains limited thanks to its panel system.
It definitely has some strengths!
I bought my XL during the last Black Friday sale. I already own a Bambu X1C and an H2D, and the XL is truly incredible. The quality and sturdiness are a cut above. I spent hours assembling and calibrating it, but it really has nothing to envy in the H2D, and the advantage is that I ultimately know the XL much better than the H2D, especially how it works.
I really don't think the XL is being abandoned; that machine is truly unique. But what you can criticize Prusa for is their general slowness... Everything takes forever with them (sorry, Prusa), but two months later they're back with a buggy firmware—I find that too long. The fixes will be delivered a long time from now, in my opinion. Prusa Slicer 3 has been announced, but there's no sign of a release date... There are announcements because they can't afford to fall behind, but it seems like a sluggish process.Personally, I'm still using version 6.4, which I haven't had any problems with at all.
RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
Bearing in mind that I personally observed tool crashes, and bearing in mind that your diagnosis of user error was wrong, since the firmware has been rescinded, I am going to go ahead and posit that you do not, in fact, know what you're talking about (as in statistics and rhetoric).
This machine works now that I've rolled it back, or at least it works as well as it ever did.
RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
Bearing in mind that I personally observed tool crashes, and bearing in mind that your diagnosis of user error was wrong, since the firmware has been rescinded, I am going to go ahead and posit that you do not, in fact, know what you're talking about (as in statistics and rhetoric).
This machine works now that I've rolled it back, or at least it works as well as it ever did.
I'm confused, a single filament print of PCCF with tool changes. May I ask why you would do that.
I believe your username says it all, but I don't think it matters at this point what the actual problem is, because I suspect you may not acknowledge it anyways.
I'm not sure what success you think you'll have since in your original post where you claim:
"Or rather, I posit the following: it is exemplary of how abandoned this machine is. I am done claiming "it's abandoned but at least it works", because it doesn't. I probably have a 50% build failure rate."
So this implies that prior to 6.4 that you were having crashes.
Oh well you win some you lose some. Keep on bashing, and I'll move on. I'll keep on printing successfully while you struggle, because there's no chance that that there's any user error, and as you stated:
"you do not, in fact, know what you're talking about (as in statistics and rhetoric). "
I'll just take my stupidity and lack of knowledge and continue to be successful with this printer.
Enjoy!
RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
Here's the latest 54 hour print I did on 6.4 using PETG with pla for zero clearance supports. I printed this 2x back to back, using 1600g of material reach, zero crashes or issues. 
RE: As of 6.4.0, the XL still crashes toolheads into one another. It is inexcusable.
Please remember different people have different experiences,
Firmware 6.4 has caused problems for a number of people,
I Believe Prusa are working on a resolution.
Regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK