Strange problem trying to print case for RRD Full Graphic

K8200 3D Printer K8200 - Issues while printing
1

I have just finished building my K8200, and have also tried some prints with good results.

Most recently, I have tried to print the case for RepRapDiscount Full Graphic Controller found here: http://www.thingiverse.com/thing:87250

I have tried it twice, and the problems seem to appear at the exact same position in the print. When going from a thick wall to an inner “inside” wall, the printer will crank up the fan to 100% and start to lay stripes of filament from one side of the case to the other.

Any ideas what can cause this?

Photo:

2

Sorry, your image link doesn’t work.

But your description sounds like the printer tries to print a “bridge” layer to thin air.
Does your case have a solid layer at that point?

Maybe you printed it upside down.

3

Thank you for your suggestions.

The case is not printed upside down, and does not have a solid layer at that height.
From the model it appears to change from a thick wall (app. 3mm) to a thinner wall, where the top of the case is supposed to snap on to the bottom.
If you look at it in Thingiverse http://www.thingiverse.com/thing:87250, I feel pretty confident, that it is at the layer where the cut-out for the SD card starts.

Should I be looking at errors in the G-code? How would thin layers look in the G-codes?

Sorry about the photo link, not sure why it is not working.

4

Which slicer did you use?

slic3r or cura engine?
Maybe the part sliced incorrectly.

How does it look in the preview of repetier?

Did you print from PC or SD card?

5

So far I have only been using slic3r.

The preview looks perfect.

Printing from PC.

Right now I am considering to try to print from SD Card.

What would it take in terms of changes and re-calibration to use cura instead of slic3r?

6

You would only have to fill in the variables in the cura settings for filament and print settings.
No re calibration needed.

But if it looks ok in the preview (sliced preview of course),
then the slicing should be ok.

Can you repost the picture?

7

Any tips for the variables to set in cura?

The sliced preview looks ok.

Maybe this works: https://onedrive.live.com/redir?resid=ED0A5D760190986D!89667&authkey=!AAX-gqTd91huEbg&v=3&ithint=photo%2cjpg

8

[quote=“npa”]Any tips for the variables to set in cura?

The sliced preview looks ok.

Maybe this works: https://onedrive.live.com/redir?resid=ED0A5D760190986D!89667&authkey=!AAX-gqTd91huEbg&v=3&ithint=photo%2cjpg[/quote]

Thanks for the pic.

Strange though.
Wich exact stl file made the problem?
I could give it a go on my printer.

By the way, your bottom layer seems to be quite imperfect (see through) too.

Maybe have a look at the printer settings in repetier.
Did you set the receive buffer down to 63 bytes?
If not, that “might” be the cause.

9

Thank you for your valuable input on this!

Can I send you a PM with the file?

I guess reducing the cache size only matters for PC connection? Printing from SD Card would be indifferent to this change?

At first I did not understand what you meant with your comments to the picture. Then I took a closer look, and I am happy to report that what you see in the picture is an optical illusion: The bottom layer is quite solid :o) Somehow glare from the table is reflected in the print.

10

[quote=“npa”]Thank you for your valuable input on this!

Can I send you a PM with the file?

I guess reducing the cache size only matters for PC connection? Printing from SD Card would be indifferent to this change?[/quote]

Yes, the receive buffer has only influence on serial communication with the pc.

Ok, nice to hear.

Unfortunately PM is not possible in this forum.

Just post the name of the stl and i will get it from thingiverse.

11

It is this one: http://www.thingiverse.com/thing:87250/#files Bottom_Case_FGD.stl

Thank you for your effort.

12

[quote=“npa”]It is this one: http://www.thingiverse.com/thing:87250/#files Bottom_Case_FGD.stl

Thank you for your effort.[/quote]

Print is already running, sliced with cura.

13

Great :o)

What parameters have you set in cura?

14

[quote=“npa”]Great :o)

What parameters have you set in cura?[/quote]

I used 0.25mm layer height and a 0.6mm nozzle. print speed 50mm/s

But i think that won’t fit for your machine :wink:

Did you already check the receive buffer setting?

my print is now at layer 14 of 37 without problem

15

Print is done. Looks absolutely fine.

What layer height did you use?
Maybe try a different layer height to slice it.

16

I tried to print from SD Card, and had absolutely no problems.

Thank you Again for all the help you have provided.

17

Nice to hear you got it working.

I think then your serial communication has problems.

Check the settings again.

did you set the Baudrate to 250000 and the receive buffer to 63?

18

Yes, I set it to 25000/63 respectively, but I have not done any prints from the PC since I had the controller set up an working.

I will try it at some point though, and keep the forum up to date with the result.

BTW. to your other questions:
I use 0.3/0.25 mm for first/successive layers.
Nozzle temp: 190C
Bed temp: 60/55C for first/successive layers.

I know that the bed temperature is a bit on the high side, but it is my experience - as little as it might be - that slight changes in room temperature, even gusts of cold wind, can cause the print to detach from the bed, and the high bed temperature, for the most part at least, pretty well compensates for that.

19

[quote=“npa”]

I know that the bed temperature is a bit on the high side, but it is my experience - as little as it might be - that slight changes in room temperature, even gusts of cold wind, can cause the print to detach from the bed, and the high bed temperature, for the most part at least, pretty well compensates for that.[/quote]

That is why i will make a different mount for my heatbed, which will then be only a glass plate with a capton heater mat glued to the underside.
That will give me a very flat bed and better thermal insulation for the heatbed from the underside.

20

Please upload pictures and your experiences with your new heat bed setup once you get that far.

I think it could interest a lot of people, including myself.