Hi,
I got my new H2D three days ago and I am / was very happy with the initial printing results.
The main reason for buying the H2D for me was the second nozzle, where I can use support filament for my technical models.
After about 15 prints I am now getting the message:
“Extruder Wechsel fehlgeschlagen; bitte wenden Sie sich an den Assistenten.”
(German)
Probably translates to:
“Extruder switch failed; please contact the wizard?”
Whatever I try, I can not overcome the message for prints with support filament!
Prints with filaments from the AMS are working fine…
(So now I am basically back to the same functionality I had with my X1C)
Anyone out there with the same problem and a suggestion for a fix?
Sup PLA … ideally right nozzle. It softens at such a low temp that the up-down motion is akin to large retraction on the older X/P machines and will balloon the filament, causing jams right before it enters the hotend.
Thank you for this suggestion. I will switch the Filament and try again.
Do you have any sources that I can read and learn from which show the differences between the right and left nozzles and how to use them best?
I don’t know if there is a restriction for Support PLA on the left nozzle. Generally, the restrictions are for softer or brittle filaments (they go in the right nozzle). Have you checked for debris in the switching mechanism?
Technically**, it’s suggested to use the left nozzle for support filaments. However, I have a special place of hate for the Support for PLA in my heart. That thing just clogs left and right, unlike it’s cousin Support for PETG/PLA.
I guess I should have asked if the chamber temps were creeping up towards 45C, as that’d definitely exacerbates matters. But I’ve had it misbehave in the high 30s just because of the latent heat of the hotend.
** unless the phrasing is off under “Recommendations for materials used for the left and right hotends” — “3. If you want to use the second hotend to print support materials, it is recommended to use the lifting hotend for printing.” Is printing referring to main printing filament?
This is what I was waiting for … what the problems were going to be with the H2D. I guess I was thinking in there would be some with early deliveries. I haven’t had any issues with the X1C I couldn’t solve myself so far, as I bought after it had been out a while.
Brittle filaments are to be used in the left nozzle according to the wiki. The right nozzles ptfe tube gets bent up pretty good when the tool head goes to the far right side of the bed.
Yup left nozzle is ideal for brittle filaments. Had a nasty extruder clog today running polycarbonate in the right nozzle after a piece of PC filament broke off and jammed in the extruder gear. Thankfully due to the open skeletonized design I was able to get the piece out with some tweezers without needing to remove the extruder assembly.
Sorry, that’s correct. I was thinking I saw it mention the left nozzle’s raising and lowering would create a problem for the brittle filaments. But I guess I was mistaken.
I switched the filament, so that the left extruder is connected to the AMS2 and the right extruder is “fed” by the single spool of “support for PLA/PETG filament”.
Also, I removed and cleaned the hotends (they were not really “dirty” after only 15 prints).
But all of this did NOT solve the problem!
The “extruder switch” continued to fail.
Then I disassembled the filament cooling fan duct and took a look at the “flow blocker”
This flow blocker with a magent mounted on top seems to be the problem!
The blocker seems to “hinder” the travel of the mechanism “deep inside the hotend” which moves the left extruder down and up.
When I “help” the flow blocker with my fingers to reach the end positions, the error message “goes away”.
As a temporary fix, I just unscrewed/removed the flow blocker, and now all works fine and printing works flawlessly.
I will investigate the impact of the missing flow blocker on the quality of my prints.
This is certainly not the final solution, but it works temporarily.
I have the “feeling” that the magnet on the flow blocker hinders when “blocking” the right extruder, the full travel inside the mechanism.
It seems to me that the magnet “sticks out” too high and makes contact with the other side too early, so that the switching mechanism can not fully push out the left extruder.
(Note: the message always only came when switching from the left extruder back to the right extruder)
