1

Hi,

I am having some trouble printing my first layer. I am quite new to 3d printing. I’ve had a few succelful prints with PLA but now I am having some troubles with ABS. As you can see in the picture, a part of the first layer looks nice while the upper right side looks ugly. I am printing the first layer of a 20mm cube with a 15mm brim.

My setting are:

Anet A8

0.4mm nozle

1.75mm ABS

103 degres bed and 233 degres extruder

First layer height 0.25mm

First layer flow 200%

No cooling fan

Tape and haispray on the bed and the adhesion seems nice

I am using slic3r for slicing

Thanks for your inputs

img_20170312_151534.jpg
img_20170312_151534.jpg2448×3264 1.77 MB

2 Likes
2

I forgot to mention that I levelled the bed multiple times and that the top part of the square can be peeled of to reveal a nice section under. So basically the top part as two layers of plastic but the head only passes once.

3

It seems the distance between the nozzle and bed is still too close. If you are using tape and hairspray you don’t have to have so many brims.

Also your first layer flow is way too high, you should set it to like 110% that should be enough. The speed for the first layer should be 50% of your print speed.

Ok first try lowering your first layer flow to 110%. If that still doesnt work level the bed again but this time increase the distance between the nozzle and the bed. That should give you a good first layer.

Then let the cube finish printing, pay attention to if the infill looks like what it is supposed to.

Once it is finished you can get a better idea what settings to change to improve your print.

4

Thanks for your answer,

the large brim was just to test if the layer was printing nicely. I tried to print it with 100% extrusion for the first layer and I got the result shown in the pictures. One side looks nice while the other looks bad. The infill looks like if there is not enough extruded material, the lines are not continuous and there are some balls of platic that form from time to time.

I will try lowering the bed and printing with 110% flow on the first layer.

img_20170312_181816.jpg
img_20170312_181816.jpg2448×3264 1.49 MB
img_20170312_181823.jpg
img_20170312_181823.jpg2448×3264 1.59 MB

5

Maybe try going a bit slower. Also check that your extrusion mechanism is working.

What I mean by that is, if you have a geared extruder, perhaps the bearing is damaged and as a result you get this uneven extrusion pattern with one side of the cube having undextrusion and the other side having over extrusion.

6

Hi

I’ve recently also had some problems with getting my ABS printer to behave properly. I am by no means an expert on this though.

From the picture, it seems like bed isn’t 100% level if you look on the bottom right corner of the image, you can see the extruder is barely getting any filament down, but top left it looks perfect. Check your bed level, get a feeler gauge if you need to and make 100% sure of it. My bed was not level and I got very similar results.

The streaking you see on the right of your print, is due to “pressure” building up in the extruder by not being able to get anything out, then when either the pressure gets too high, or the bed moves away it squirts out all the filament. And once your bottom layer is a mess, it just compounds the mess as it goes along.

1 Like
7

Level the bed. Temps are ok.

What slicer? I might reduce the first layer height to 100% of the layer height and reduce the flow.

Basically it looks like you are to close to the bed.