What could be the reason for those bubbles? Bed temp: 75 Extruder temp:

3D Printing
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1

What could be the reason for those bubbles? Bed temp: 75
Extruder temp: 185

PLA, GREY

Rapide Lite.

I am printing at one end. Other end it came very good with above settings.

cfb9d7ae6d8fd0b9ee2b65e8abae26af.jpeg
cfb9d7ae6d8fd0b9ee2b65e8abae26af.jpeg3120×4208 1.65 MB

2

i asume - bad adhesion, temperature of heated bed must be 65-70C for PLA, also try to use ABS-juice. Extruder must be 200-205C. Also you can try to print 1st layer 50% slower.

3

OK will try with 65.

4

I use no heated bed, just hairspray, but it looks like your nozzle is too close.

5

My guess is that you have problem with the z endstop. Your nozzle is too close to the bed. That also leads to bad adhesion. You should have no problems wit PLA sticking to the bed at >70 deg.

6

I do bed 60 for the first layer, then i move down to 55. However, you picture shows a Z too far off the bed so, your first layer is not ‘planted’ firmly enough.

Try to set your first layer to be 125% of your regular layer thickness, and or, lower your Z a bit more.

7

I think that particular corner bed is tooo close to nozzle. I will lower it a bit too. Also will try to lower temp as suggested.

8

I had a similar problem on vertical walls. Fixed with replacing nozzle with a new one that was more pointy.

9

I thinks nozzle its too close to bed

10

I’ve been getting this for the first time with a new roll of PLA I bought. After a load of head scratching it looks like a couple of issues for me:

  • One corner of the bed was almost a full layer higher than the others, so the filament when extruded on the side was squishing out wider than normal and not adhering combined with;
  • this particular filament was a very sticky and stretchy kind, so when the nozzle was coming past on the next line, it was catching the wider previous line which then stuck to the nozzle and came up.

You may want to ensure that your bed is well levelled (I’ve found for stickier filament like this, the mech end stop and auto level G29 itself isn’t accurate enough for good adhesion) and then try playing with your extruder temp during prints. You are at the low end at 185, so try increasing it by 5 degrees a time during the print and see how it reacts (don’t go over 210 though!)

Hope this helps!

11

Hi… Was trying all your comments / guide.

  1. Purchased local brand of HairSpray
  2. As Cura does not support Z offset, did some workaround thru gcode modification. Tried from -1mm and ultimately found -0.2mm is good and works ok.
  3. Removed kepton tape came with printer.

It worked. But still forced to keep bed temp @70.