@cosmowave said in 1.8mm Bondtech CHT nozzle print issues:

A Nozzle with closing mechanism is needed...but that's not easy to design. 🤔

Yes, that's something that I've been thinking about for quite some time. Going back to my automotive days, that's how fuel injectors work - it's called a "pintle valve". As well as large nozzles, the other use case would be active mixing hot ends where retracting filament doesn't necessarily result in relieving pressure at the nozzle tip due to the size and design of the mixing chamber.

@joehsmash i see many people say to put the accelerometer at the nozzle head to replicate at the printing source. i did not do this however and i simply placed the accelerometer on the top of my motor and called it good enough.

@caygul Glad that worked out for you.

Glad you got it sorted out. Those intermittent connection issues are hard to pin down.

@dc42 said in Struggling with PT1000 calibration:

If you are sure of the accuracy of those resistors, then RRF is working as it should. Either your PT1000 sensor is inaccurate, or your thermocouple sensor is inaccurate, or you have not succeeded in getting those two sensors at exactly the same temperature.

I have far more faith in the accuracy of the resistors than the accuracy of the thermocouple readout. The 2000 ohm is a pair of 1K .01% resistors in series. The 1096 is a 1K and 100 ohm resistor - but I sorted through a number of 5% resistors to find a pair that added up to 1096. Checking these with a good Fluke digital meter. I have a couple more Slice PT1000 sensors on the way. If they are in line with the other, I won't sweat it. Having them consistent across several machines is the goal.

@Dizzwold Not holding it against you at all. Just mention it next time as it may lead the help/advice a different route. Technically there isn't a clone Hemera just similar looking products.

Glad it's working now.

@markz That was the golden nugget
Took me a few days, (a week, fffff) but yeah I'm not using OpenPNP so I have to create this in python directly, and the secret was in using G31. I really appreciate your help.

@Jered FYI, it might be worth creating a macro called 'motor_settings.g' which contains your default acceleration limits etc. You can then call that in config, and at the and of your homing files etc so you only have one place to change your machine limits. I do this on my printer.
Alternatively you could achieve something similar using global variables but I have not been adventurous enough to try them out yet!

@Egon-Net sorry for bothering. Now I could find all parts myself as well. Sometimes you just need a day off…

@dc42 Thank you so much for the help!!!

Back to basics https://docs.duet3d.com/en/User_manual/Tuning/Delta_calibration

@dmbe11 Monitor 0 will be triggered because the temperature reached 312 and I expect the maximum heater temperature command is on the default (290C)
https://docs.duet3d.com/User_manual/Reference/Gcodes#m143-maximum-heater-temperature

That said the issue is you have 40+C overshoot during tuning which is so much that the tuning algorithm throws an error

The M303 command does not have a setting to allow for a wider range as far as i can see:
https://docs.duet3d.com/User_manual/Reference/Gcodes#m303-run-heater-tuning

You can try tuning with a lower PWM (e.g. setting the P parameter to 0.7 or 0.5) however presumably you have such a high power heater because you are going for extremely high flow rate so you need the full 70W when extruding fast?

Maybe @dc42 has a suggestion on how to tune in this scenario.

@RogerPodacter said in abnormal noise when changing direction:

M566 X1000.00 Y1000.00 Z6.00 E300

You may want to raise your Z and E jerk values. 6mm/min is very slow and could be limiting your XY movement in unexpected ways especially if you have mesh compensation active. Same can be said for a too low E jerk value. A circle is made up of many small segments, and with a low jerk value the extruder may be trying to halt at each segment connection. Try increasing your E jerk to 1000, 2000, or even 3000. And increase your Z jerk to at least 60.

@Dizzwold said in Some Novice Questions:

Can I ask what slicer you use?

I use PrusaSlicer. But I also set up Cura in case there should be any problems with the PrusaSlicer. But it has only happened once so far.

In config.g you set the speeds as high as your printer can handle or the maximum speeds that you do not want to exceed.
In the slicer you then set the speeds you want for your component or for your filament.

Printer settings in the slicer can make the speeds entered in config.g slower, but not faster.
For example, if config.g says 20000mm/min for the maximum speed and 10000mm/min in the printer settings in the slicer, then 10000mm/min is used.
But if there are 30000mm/min in the printer settings in the slicer, then it stays with the 20000mm/min from the config.g

There are two camps on how to manage your filaments.
Some do it with the DWC.
The others manage their filaments in the slicer.
You have to find out what works best for you.
I manage all my filaments in the slicer (if the slicer can).

I also have a custom GCode for each filament in PrusaSlicer, e.g. the Pressure Advance value is in there, since each type of filament (PLA, ABS, Nylon etc.) should have its own Pressure Advance value.
So a pressure advance value in config.g that is valid for all filaments can work well... but doesn't have to.

There is also a text field for comments that I can make about the filament, for example, it says what oversize I would have to print with the filament in order to get true-to-size components.
Each filament shrinks to a different extent when it cools down to room temperature.
I then transfer this value to the slicer, for example when I print a component from different filaments, so that later everything fits together and I only have to rework a little.

This is my start code in the slicer (please do not copy 1:1)

T0 ; set tool #0 G21 ; set units to millimetres G90 ; set to absolute positioning M106 S0 ; set fan speed to zero (turned off) G28 ; home M116 H1 S2 ; warten bis das hotend +-2 grad celsius der erwarteten temperatur erreicht hat G1 Z5 F1000 ; hotend 5mm heben G1 X165 Y143 F7000 ; zur druckbett-mitte fahren G30 ; z-hoehe aus bettmitte holen G1 X100 Y-15 Z1 F7000 ; zum startpunkt fahren G92 E0 ; zero the extruded length G1 E30 F200 ; nozzle fluten G92 E0 ; zero the extruded length again G29 S1 ; mesh laden

This is the end code in the slicer (please do not copy 1:1)

G91 ; set to relative positioning G1 E-2 F1200 ; filament retraction 2mm G1 Z10 F1000 ; hebe die nozzle um 10mm G90 ; set to absolute positioning M104 S0 ; turn off nozzle heater M140 S0 ; turn off bed heater G1 E-8 F250 ; retract the filament slightly G28 X0 ; move to the X-axis origin (Home) G0 Y230 F800 ; bring the bed to the front for easy print removal M84 ; turn off stepper motors M107 ; turn fan off M106 P2 S0 ; led beleuchtung aus G4 P1000 ; 1 Sekunde Pause M106 P2 S1 ; led beleuchtung an G4 P1000 ; 1 Sekunde Pause M106 P2 S0 ; led beleuchtung aus G4 P1000 ; 1 Sekunde Pause M106 P2 S1 ; led beleuchtung an G4 P1000 ; 1 Sekunde Pause M106 P2 S0 ; led beleuchtung aus G4 P1000 ; 1 Sekunde Pause M106 P2 S1 ; led beleuchtung an G4 P1000 ; 1 Sekunde Pause M106 P2 S0 ; led beleuchtung aus G4 P1000 ; 1 Sekunde Pause M106 P2 S1 ; led beleuchtung an

It doesn't matter if commands already given by the Duet are repeated here.
T0 is also at the end of config.g, for example.

The important thing is... what is in the Slicer Start GCode is done, so if T1 were there I would have a problem because I only have one print head, i.e. only T0. The print could not be started because the Duet would report a problem.

I hope I could help you.

Google Translate
-- Original Text --

Ich nutze den PrusaSlicer. Aber ich habe auch Cura eingerichtet, falls es mal Probleme mit dem PrusaSlicer geben sollte. Es ist bis jetzt aber nur einmal vorgekommen.

In der config.g stellst Du die Geschwindigkeiten so hoch ein wie Dein Drucker es schafft bzw die maximalen Geschwindigkeiten die Du nicht überschreiten möchtest.
Im Slicer stellst Du dann die Geschwindigkeiten ein die Du für Dein Bauteil oder auch für Dein Filament möchtest.

Drucker Einstellungen im Slicer können die Geschwindigkeiten die in config.g eingetragen sind, langsamer machen aber nicht schneller.
Steht in der config.g zB 20000mm/min für die maximale Geschwindigkeit und 10000mm/min in den Drucker Einstellungen im Slicer, dann wird die 10000mm/min genommen.
Stehen dort aber 30000mm/min in den Drucker Einstellungen im Slicer, dann bleibt es bei den 20000mm/min aus der config.g

Es gibt da zwei Lager wie man seine Filamente verwaltet.
Die einen machen das mit dem DWC.
Die anderen verwalten ihre Filamente im Slicer.
Du musst für Dich heraus finden wie es für Dich am besten passt.
Ich verwalte alle meine Filamente im Slicer (wenn der Slicer das kann).

Ich habe im PrusaSlicer auch einen benutzerdefinierten GCode für jedes Filament, da steht zB der Pressure Advance Wert drin, da jede Art von Filament (PLA, ABS, Nylon etc.) seinen eigenen Pressure Advance Wert haben sollte.
Also einen Pressure Advance Wert in der config.g der für alle Filamente gültig ist, kann gut funktionieren... muss aber nicht.

Es gibt auch ein Textfeld für Anmerkungen die ich zu dem Filament machen kann, dort steht bei mir zB mit welcher Übergröße ich mit dem Filament drucken müsste um maßgerechte Bauteile zu erhalten.
Jedes Filament schrumpft wenn es auf Zimmertemperatur abgekühlt ist, unterschiedlich stark.
Ich übertrage diesen Wert dann in den Slicer, wenn ich zB ein Bauteil aus verschiedenen Filamenten drucke, damit später auch alles zusammen passt bzw ich nur wenig nacharbeiten muss.

Das ist mein Startcode im Slicer (Bitte nicht 1:1 übernehmen)

GCode siehe oben

Das ist der Endcode im Slicer (Bitte nicht 1:1 übernehmen)

GCode siehe oben

Es ist hier nicht schlimm wenn Befehle die bereits vom Duet vorgegeben wurden, hier wiederholt werden.
Das T0 steht zB auch am Ende der config.g.

Wichtig ist... das was im Slicer Start GCode steht, wird gemacht, würde da also T1 stehen hätte ich ein Problem weil ich nur einen Druckkopf habe, also nur T0. Der Druck könnte nicht gestartet werden weil das Duet ein Problem melden würde.

Ich hoffe ich konnte Dir etwas helfen.

@Phaedrux OI think that one of my z axis was binding. I put some teflon lubricant on the z screw drives and it is working.

@jay_s_uk Go figure I completely forgot to change that. That worked thanks.

@that-guy-e not really. It's just a standard warning from the firmware

I used to use a NEMA-23 driven ball screw on the Y axis of a printer. It had a horrible mechanical resonance that I was never able to get rid of. The axis could run just fine at any speed up to about 150 mm/sec, except at 50 mm/sec it would make awful noise and would skip steps. I limited maximum print speed to 40 mm/sec and it worked great. Eventually I converted it back to belt drive and there were no more resonance issues.