UM² Printing more than 24 hours non-stop

[geeks 1]

Hello,

 

I have to make large parts for a model. It is that time of Cura told me more than 24 hours / parts. I fear more than the machine does not take the time to print without problems.

 

What advice would you give me to avoid problems and make these great prints?

 

[gr5 2,235]

I have done prints > 24 hours. And I had a failure (nozzle clog) on one. I was able to continue the print - it was on the UM2 with heated bed so the most important advice is to keep the bed hot and don't panic. You can wait a few hours before continuing. If the bed had cooled the part would have popped off the bed.

To continue the print I had to use pronterface to move the Z axis up and down until I found the exact layer that had just finished. Then I had to edit the gcode - deleting all the begining part and adding a G92 code for the Z axis. Let me know if you need more details.

 

[geeks 1]

Ah yes! Indeed! :oops:

 

Okay, so there it makes me even more scared. :oops:

 

A nice solution would be to 2h printing with a first file.

2 hours more with a second file.

 

And so on.

 

Except that. If I do that, how to make this task automatically. I do not Pronterface.

 

[gr5 2,235]

1) It helps if you can break up a part into multiple pieces and print them separately like this one which is split into 4 pieces:

http://www.thingiverse.com/thing:268757/#files

 

2) Pronterface is free and useful for experiments and tests and fine control. For example if you want to experiment with different accelerations on the Z axis:

http://koti.kapsi.fi/~kliment/printrun/

 

3) Don't worry so much. Just start printing. Understand that if it fails part way through then:

A: Don't let the bed cool!

B: Understand that you can continue it later. You can even wait a few days.

 

More details here:

http://umforum.ultimaker.com/index.php?/topic/4213-ideas-for-recovering-failed-prints/

[geeks 1]

Ok Here I completely understand!

 

So for me, step 1 would be to do a test on a small piece.

 

That should be used as gcode for:

1 / Start printing

2 / gcode Part 1 Part

3 / Stop print, plate movement and nozzle

 

Repeat as many times as chip parts.

 

I'm sorry but I'm still too novice To approach to re-code gcode under UM ².

 

[geeks 1]

The best thing might be to take a small sample piece to be cut in two and tested. Finally when I could understand the minimum sequence.

 

[geeks 1]

Talking about this example:

https://drive.google.com/file/d/0B8rzHF-dEgkdQWNvblNIYjR4Ums/edit?usp=sharing

It will be more easy!

 

[eldrick 65]

It would be less reader-hostile to post the gcode as a downloadable file instead of as embedded text.

 

[gr5 2,235]

So for example, in your gcode above, if you wanted to continue at layer 48 (z=5.1mm) you would delete everything up to layer 48 and start the gcode with this little snippet:

;FLAVOR:UltiGCode

;TIME:1360      

;MATERIAL:2282      

;MATERIAL2:0         

;Layer count: 78

;LAYER:0

G0 F9000 X0 Y0 Z5.1 ; home head and move straight up so as not to hit part

G11 ;unretract

M106 S255 ; fan on full - not sure if this is smart

G92 E1749.75789   ;very important step - this is the last extruder position on layer 47

;From here on nothing is changed...

;LAYER:48

G0 F9000 X134.40 Y120.90 Z5.10

;TYPE:WALL-INNER

G1 F3000 X95.60 Y120.90 E1751.30989

G1 X95.60 Y119.10 E1751.38189

The important two steps are to move Z to where the next layer starts (5.1mm up) and to zero the extruder at the current extrusion amount (1749.75789mm of filament).

 

[geeks 1]

Ok to restart from a certain layer. But how to stop layer 77?

 

It must be said that the head emerges from the present case.

 

[geeks 1]

This is a test version of a cut layer 25

https://drive.google.com/file/d/0B8rzHF-dEgkdYXFFYWR6SFl0OVk/edit?usp=sharing

https://drive.google.com/file/d/0B8rzHF-dEgkdYjdnZUFGWXRyYmc/edit?usp=sharing

 

[gr5 2,235]

But how to stop layer 77?

Hit power switch.

You misunderstand. We are talking about 2 different things:

1) It is possible to break a part up into multiple sub parts using CAD software. Then print the different sub parts. You have to choose carefully where to break up your part.

2) If a print fails, you can continue where you left off with my explanation above.

 

[geeks 1]

Ah!

 

We are talking about two different things! Ok!

 

I find temporary solution. I will print smaller parts. When the concept is good, I'll do the draw on an online service to have things to clean up on the final prototype.

 

[illuminarti 18]

Why not just print it? The longest print I've done so far was 48 hours, and so long as I made sure the filament (on the floor) was loose and untangled every 6-8 hours, it ran just fine.

 

[geeks 1]

Exactly! When I see what I see!

 

So in the end, I actually realize myself parts. I'm good for 24 half-shells.

 

To this day, I make exact copies of the original 50%. Everything is beautifully past and I do not see what would block this achievement.

 

I would put up a picture of miniature parts. I can attack a version courira 24 and older.

 

Thank you for this information illuminarti. That shows that it is feasible.

 

A track that I have not explored this is agmenter layer thickness. I guess it is more restrictive. I must remain faithful Tred and high quality. I can not afford to fail.