Build ready. So far so good. Q&A collection
Hi,
after two days the build is ready. First print (batman logo) was quite good.
Now the first prints via Octoprint are running.
Q1: Do you guy have some special commands in your custom GCode for Octoprint?
I already set the long running commands to:
M600, G4, G28, G29, G30, G32, M400, M226, G80
Q2: What bugs me and does not help for quality: The extruder temp is swinging happily... Not very good for constant quality....
[attachment=0]2016-12-03 00_10_13-Prusa i3 mk2 [OctoPrint].png[/attachment]
Will isolating the hotend help?
Q3: I have some flickering now and then on the LCD, I guess I have to get the cables better layout inside the RamboBox?
Oh and another one:
Q4: Octoprint keeps nagging me about objects not fitting in the print space, It tells me something about Y-Axis of -3mm and I guess thats the intro line... How to avoid that, I can disable the check but that not the best I guess if there is an object whicg REALLY does not fit.
But one is for sure. This is my third printer and the first print was never so good 🙂
Carsten
My Prints: https://www.prusaprinters.org/social/15695-carsten/prints
My Employer: https://make-magazin.de
Re: Build ready. So far so good.
Can't help you with Octoprint, i prefer Repetier-Server but otherweise:
Q2: When set to 205°C, my MK2 seems to oscillate just like yours between 200°C and 206°C. I think this could be fixed by autotuning PID values, but so far i haven't bothered. Check out Thomas Sanladerers video about PID tuning here:
Q3: Same here. Messing with the routing for the 2 flat cables connecting the LCD to the Rambo makes it better (or worse). Some folks successfully wrapped these in aluminium foil. Since we are printing via USB I am not too worried about it, but i do wonder if some of the folks with issues whenb printing from SD aren't running into problems because of this.
Q1: In Repetier-Server, i am using
M104 S0 ; turn off temperature
M140 S0 ; turn off heatbed
M107 ; turn off fan
G1 X0 Y200 Z200; move extruder out of the way
M84 ; disable motors
to run when a print gets aborted - i.e. terminated through the web interface.
(Never had to deal with long running commands in Repetier, and Q4 i've never seen in Repetier either.)
Re: Build ready. So far so good.
Definitely autotune the PIDs. I just got my second MK2 and it has the same problem. Not sure why Prusa Research is not fixing them or am I missing something?
You can try my PIDs M301 P21 I1.6 D70
I am using OctoPrint (OctoPi image) and had no problems so far. When and where does it warn you? Never seen that...
Re: Build ready. So far so good.
Thanks for your great input!
Answered:
Q2: Did a PID tune and it is *much* better now. Will repeat with the new values.
Q1: Thanks, I try that.
Q4: I found an option to set a allowed bounding box in Octoprint, seems to work I set the allowed range to -3 Y
New Qs:
Q5: The shown temps (at least what I can measure, room and bed) are 10 degrees off. So having 20°C room the bed/nozzle shows 30°C. When the bed is at set 55°C I measure 69°C (infrared therm). The default temp for the Prusa PLA is set to 205°C so I fear I print to hot. I know I have to tune it for my printer/material but thats way to different.
Cheers,
Carsten
My Prints: https://www.prusaprinters.org/social/15695-carsten/prints
My Employer: https://make-magazin.de
Re: Build ready. So far so good. Q&A collection
Oh @stephan.k;
will "M84 ; disable motors" disable the Z Motors as well? I heard they are always powered (to keep the Z Axis equal). Have to check
Carsten
My Prints: https://www.prusaprinters.org/social/15695-carsten/prints
My Employer: https://make-magazin.de
Re: Build ready. So far so good. Q&A collection
Since M84 is used in the standard end script as well, it can't have any negative side effects
(PS: they do stay powered)
Re: Build ready. So far so good. Q&A collection
Ok, firmware thingy then.
Carsten
My Prints: https://www.prusaprinters.org/social/15695-carsten/prints
My Employer: https://make-magazin.de