[H-GEN] problem with my ender 3 printer

[Peter Robinson]

Thanks - the alcohol is so I will stick to the table - I mean the first 
layer will stick to the table - must be something I drank - that's not 
the problem but on more careful looking at a post I found a solution.

For anyone who gets the same problem here is a solution.  I think what I 
have done is the right approach - it eliminates the problem anyway. It 
appears to be a flow rate problem.

First I am using Ultimaker Cura as the slicer.

In Extensions > Post Processing > Modify G-code there is a script called 
ChangeAtZ
  I set it to trigger setting the flow rate to 100% at layer 3 (I think 
counting from 0) and then in the part of Cura where you do the setup I 
set the flow rate for the first layer at 100% and then subsequent layers 
to 85%.

It's a bit funny but the idea is that it prints the first layer at 100% 
(which was OK before) then reduces to 85% for 3 layers and then goes 
back to 100%.

The 4th layer was slightly rough but then it  did a filler layer and was 
OK after that (as before).



On 13/10/20 2:43 pm, onefang wrote:
> On 2020-10-09 15:29:04, Peter Robinson wrote:
>>     I have an ender 3 and am using OctaPrint and Klipper running on a RPi.
>>     I thought I had pretty much dialed it in but I am trying to print
>>     something with a pretty wide base in PETG - the first layer goes down
>>     pretty perfectly then the next layer has a little stringing and then
>>     each layer gets more stringy with blobs shed from the printer head
>>     until the infill layers where it seems to recover and the normal layers
>>     above that are all perfect.
>>     A bit of duck-duck-going revealed others with exactly the same problem
>>     but no solutions. I have being playing around but can't seem to fix the
>>     problem.
>>     Any ideas?
> I vaguely recall that alcohol helps.  Not sure if you feed it to your
> printer or to yourself, but I don't do any 3D printing, I just stumbled
> across that somewhere.
>