conny_g
-
Posts
802 -
Joined
-
Last visited
-
Days Won
12
Content Type
Forums
Events
3D Prints
Posts posted by conny_g
-
-
I have had my head(s) crashing into the chassis at X=0 Y=0 after upgrading to Cura 2.6.2 now.
Browsed through this thread as I remembers to have read about it.
I think it's this Travel > Layer Start X/Y parameter that need to be set to X=100 Y=45 (or something there). Just reprinting to test.
If this is an issue for everyone and if that is the fix we should include that into the Mark 2 documentation. Will report.
YES! It survived the 4th layer now when it usually happened.
-
1
-
-
Serious answer:
the Bondtech feeders have a very different sound profile. While the UM ones do a heavy "beep" the Bondtechs do a high pitched "zzzzt, zzzzt". Much less annoying. I love my Bondtech feeders.
-
We have Spotify with Sonos in our office but still
Maybe you need a script to sync the beeps to the beats of the music ;-)
SCNR.
-
Hi @neotko,
Thanks for the very informative post.
Is it possible to order a couple of these glasses from you?
Thanks :-D
Sorry no I don't sell them. But the shop where I got them told me that they do deliver worldwide. Drop them a mail and they will give you info.
Interested, too.
-
1
-
-
To summarize, it seems that the leaning problem is due to rounding errors because of the printhead 2 offset settings, when those X/Y values are not multiples of a microstep (0.0125)
Am I correct ?
My assumption would be that there is a rounding issue happening if the current position before the tool change resp. at the start of the toolchange plus the extruder offset go across a rounding boundary. In my view the extruder offset alone can't be the reason otherwise the rounding would correct itself when changing back and only extruder 2 would be off, extruder 1 would be ok again. So the sequence of changing to and back and adding/subtracting the offsets 2 times causes the rounding to go "left" one time and "right" the next time.
I think it needs a simulation in Excel to confirm or some debug output every time before adding/subtracting the offsets during tool change. Unfortunately I am on vacation for a week now, too...
-
Interesting.
So it seems confirmed that it has to do with the extruder offset.
But I don't understand what would be different if the offset is configured the one or the other way, the math done during tool change is the same.....
-
What happens in the firmware is that for the toolchange the extruder offsets are added and subtracted, but in difference to other actions not coupled to a physical movement. It's basically an offset change of the axis. And that seems to cause an offset in the physical position with every change.
That needs mathematical verification, but maybe it happens if the extruder 1 offset is a certain fraction of a microstep off vs extruder 1 so that the rounding falls to the wrong side.
-
2
-
-
If my theory is correct, it could be solved by setting the offset to a round value before doing a calibration. (and the influence would be invisible)
Let me recapitulate:
- The extruder offsets are added to the current position on a tool change.
- We are guessing that the leaning has something to do with rounding errors of the Marlin planner (which "translates" the moving path to the number of steps).
- the current suggestion is: rounding of the extruder offsets to a multiple of one microstep (1/369mm for the UM2+ feeder) and check, if this makes a difference
correct me if i'm wrong...
Not 1/369 of the extruder steps, the 1/78.xxx of the X/Y steps. The 0.0125mm.
-
1
- The extruder offsets are added to the current position on a tool change.
-
Would one of you want to try to add this at the beginning of the gcode file:
M218 T0 X0 Y0
or
M218 T0 X0.0125 Y-0.0125
(with correction of the leaning direction however this is happening for you)
This sets the head offset in the firmware.
The head 2 offset is calibrated explicitely, but maybe it helps to zero or to correct head 1.
-
Regarding the offset per layer, here's a calculation I did on basis of Melka's print in the developer's thread:
-------------------
That's 486 layers. 3.5mm/486=0,007201.
Hey, but when dual printing Cura prints two layers before it does a tool change!
0,0072x2=0,0144 and that's a tiny bit more than one microstep.
486/2*0.0125=3.04, that would be the offset/leaning with the microstep.
Are you sure it's 3.5mm and not 3.0mm?
Anyway, it looks like a toolchange offsets one microstep in X and Y. -1 in X and +1 in Y. (Weird that it's not both the same direction)
Now the question is if it's a mechanical issue or a software issue.
I think it's a software issue, it's too steady for mechanical and even the 2nd head was not present at all.
-------------------
-
I did it
...Got my first dual extrusion print.
It came out pretty well. I think I have to calibrate the settings it a little bit. There is a lot of extra filament coming out of the second extruder. I don't know how it's called. When the second head will start it's part of the layer there is always coming some filament out of the nozzle and that messes up the print a little, but I'm still satisfied.
It's called oozing, is that what you mean? You could try less temperature. Are you using Cura or S3D? I think that Cura does temperature management of the stand-by nozzle, but S3D doesn't?
-
Another thought: what about the current of the stepper motors? If I remember right, i use 1150mA for all of them. Perhaps that has an influence as well?
And how much current draws the led light? (my led stripes are broken, so I don't use them). This are the only other differences that I can think of.
The LEDs - if they are some 15W/m type (but I would think they are less) - would use some 15-20W as the it's a bit more than 1 meter, maybe 1.20m.
-
I must admid that i am a picky guy, the dual extruder parts that i print at this moment are already very nice. Maybe the tolerances i want to archieve are not neccesary, but i want it just to be good!
Really cool that Mark 2 is now in production and that it works for you guys, too :-)
At the same time my S3D UM mk2 profile seems to get better and better.
Would you be willing to share the profile?
With Mark 2 I started to mostly use Cura, as Cura 2.3+ is so much better than the Cura 1.x that I used in the beginning and that made me switch to S3D. But S3D is really better for some special cases like 1 perimeter walls, Cura just still messes that up as it's algorithms are built for closed-loop walls.
So if you want to print something "paper thin" like a lamp shade or so S3D gets it sliced very much better.
-
Bondtech ordered .. can anyone tell me the right length for the Boden tube for the second extruder or is this to early...
I have switched to Bondtech as well and bought 2m in spare to make sure I can do everything I feel like later on.
The bowden length depends a bit on where / how you mount the feeders, there are multiple options.
-
Did you ever get this resolved? I have a grinding noise, too. When the head moves X direction (left/right). The noise seems to come from the far right corner for me.
-
"maybe an extra heater in the chamber + chamber temp control." Noch keine Idee
Ich hätte dazu eine Idee: https://www.amazon.de/gp/product/B000OIH1FU/
Gerade für seinen originalen Einsatzzweck gekauft, könnte man aber auch unter / neben den Drucker stellen um den Bauraum zu beheizen. Macht 60-70 Grad, 1.000 Watt.
Ist im Prinzip ein Heizlüfter mit Beinen und oben einem Gestell mit dem Ballon für die Wäsche.
Der Lüfter sieht so aus: https://img.clasf.co.za/2014/09/19/Dri-Buddi-Super-Fast-Electric-Clothes-Dryer-20140919003450.jpg
Die Stange oben kann man abnehmen. Die Füsse sollte man wg. Lufteinlass dranlassen.
-
A bit late to this thread, but I am just having the opposite issue:
Every time the nozzle retracted and starts at some other position I get a small blob there. Especially bad with small areas where there just needs to be 1-2mm of area extruded.
I used this setting to reduce this blob and I used -0.25mm^3, it seems to help.
0.25 is slightly more than the cube of nozzle diameter. 0.4 x 0.4 = 0.16.
-
1
-
-
I think that there is no "best" product, just different sophistication levels and use cases covered. From organic modelling (arts stuff) to exact CAD drawings to beginners quick drawing tools with strong limitations.
For 3D printing there is lots of tools that try to simplify 3D modelling, but likely they are restricted by their simplicity - not tried them. But maybe ok for the start, depending on what you want to do.
You need to be prepared to try 2-3 products. I have used ViaCAD and liked it, now I am trying Fusion 360 and like it better :-)
Other say FreeCAD is good etc.
You should google for an hour, look at a few tutorial videos for the popular CAD programs and try something that you like.
-
Moin,
Das mit dem Umstecken habe ich gar nicht gesehen.
Naja ging auch mit löten, wenn das nötige Werkzeug vorhanden ist.
Bei mir sind beide Olsson Blöcke gleich.
Falls sich jemand für Intererssiert, ein Link für meine Dual Bondtech-Feeder Halterung:
https://www.youmagine.com/designs/bondtech-dual-feeder-mount
Gruß
Alex
Danke! Wo sind die dann montiert am UM, hättest Du da ein Foto dazu?
-
Ich habe gedacht, das mit dem Grinding sein nur bei mir ^^
Gut zu wissen, dass das ein Standard Problem ist.
Der Bondtech soll laut sein, dass könnte für mich problematisch sein. Schon jetzt muss ich aufpassen wann ich drucke. Sonst steigen mir die Nachbarn aufs dach.
Kann mal jemand ein Video machen wo man einen vergleich hört?
Ja, das Grinding ist ein Standardproblem bei bestimmten Materialien und/oder Drucken. Das meiste ist ok, aber es gibt halt immer Grenzfälle. Materialien wie die Woodfill oder Flex-Filamente scheinen wohl tlw. sehr undankbar zu sein.
Laustärke: mein Eindruck ist die UM Feeder sind außergewöhnlich leise. Für meinen Umbau auf Dual habe ich einen 2. Feeder selber Art (UM2+) außen hinten rechts oben montiert (von vorne gesehen) und der ist sehr viel lauter als der "interne". Anfangs dachte ich sogar der Mount wäre zu eng und das Zahnrad hat so viel Reibung und würde davon kaputt gehen. Das ist aber der normale Klang, wenn die Halterung mitschwingt. Bei der Retraktion brummt der "externe" ziemlich ordentlich.
Ich würde meinen, dass diese Lautstärke eher der Standard ist und dass UM2+ gute Arbeit gemacht hat den Feeder leise zu bekommen.
-
Danke für die Rückmeldung zu den Bondtech, genau so habe ich mir das vorgestellt, wo sie besser sind.
Ich hatte auch schon den einen oder anderen Druck mit vielen Retractions der deshalb letztlich fehlschlug. Ich glaube ich habe Lust die mal zu versuchen.
-
Wie ist Eure Erfahrung mit Bondtech Feedern, besser als die von UM2+?
-
Wird mit dem Hub eine Retraction gemacht?
-
Minimum orders being what they are, I have overflow. If you want, I could send you a set?
Hi @SyntaxTerror,
(I love your handle, BTW!)
I am interested in taking you up on your offer. I will PM you and we can hammer out the details.
Thanks very much! You are very kind!
Ah, no worries. I'd love to see a video of my face as I was trying to place the order. First I put 12 in the cart. Multiples of 10 only, it said. Fine, 8 more in. Then I ran into the minimum order amount. Fine, I did a quick calculation and learned I needed 50. So 30 more in the cart. Then because of the amount of magnets, it gave me a discount that put me below the minimum again. In any case, now I have enough magnets to do this thing to 10 printers.
LOL!!!
...Got my first dual extrusion print.
Anyone knows what are these small corner blobs and how to get rid of them?
in UltiMaker 3D printers
Posted
Great lesson learnt, thanks for sharing!