Bottom layers of model not bonding - solved

[ecflam 0]

Hi I am a newbie to 3D printing, just got an ultimaker 2 and has been experimenting with it.

I found that the few layers of my models constantly are not bonding together are strands are coming off. This is true for models with or without overhangs.

I searched different forums but I could not solve this issue. I have attached the top and bottom image of the model. The top looks great. But the bottom has strands coming out.

Top: http://lavandespa.com/images/temp/top_print.jpg

Bottom: http://lavandespa.com/images/temp/bottom_print.jpg

Here are my settings:

nozzle temp: 230

bed temp: 60

print speed: 35

retraction length: 5.5

retraction speed: 35

layer height: 0.1 or 0.2 (0.1 gives slightly better result for overhangs)

Fill bottom/top thickness: 0.6

Fill density: 20%

Support type: touching plate

Adhesion type: raft or brim (same issue with either)

Cool:

min layer time: 5

Enable cool fan: ON

Fan full on at height: 5mm

Cool head lift: ON

Infill: 15%

Please let me know how I can improve the print. Thanks.

 

[Nicolinux 288]

Hi,

you should re-level the bed. (UM2 menu -> advanced, build plate). Make sure the gap between the nozzle and the bed is very small. When the bed and the nozzle are cold and you slide a piece of paper between them, you should feel very very little resistance.

 

[ecflam 0]

Thanks for the fast response. I adjusted the buildplate and the result came out much better. Thanks.

 

[closedcircuit 1]

@ecflam: After you've completed the bed calibration as per Nicolinux's suggestion, check that the brim prints well (it should be very slightly flattened). If it's not perfect, stop printing, recalibrate the bed once more and try again.