Strange First Layer after update  

Re: Strange First Layer after update

So... Nevermind?

Turned out I was printing "Fast" print quality with the stock Simplify 3D settings vs "Medium" as I was before. Switching that, it printed fine but that begs the question how is the Fast print quality setting that far off? Was it a fluke or does anyone know if S3D's default settings have any issues (will followup with them as well).

Not so fast... It still looks a little less than ideal here, the top part still seems ok but the bottom part has some issues...

Bottom part, still has some imperfections

Top part, looks pretty decent

Re: Strange First Layer after update

gcode of the print above, somewhat successful but wondering what i can do to improve that first layer.

https://gist.github.com/billchurch/bf361c01c61c306cf3e54d2dd2ed1613

Re: Strange First Layer after update

It's definitely S3D settings, the latest version of Prusa Control 0.9.4 b415 on Fast quality blew away what S3D did...

Now I have to look at the S3D settings again **sigh**

Not finished printing but light years better...

I'd use Prusa Control but it's just a bit too basic...

Re: Strange First Layer after update

Move to Slic3r. AFAIK, prusa control is Slic3r with a limited ui. Lots of people use S3d, so that one should be fine too. I use slice3r so cannot help with this.

Re: Strange First Layer after update

I'm having the exact same issue but I'm using slic3r. Looks just like that and if I can get at least an ugly but serviceable first layer down the rest of the object prints great.

If I print other gcode like the live z adjustment calibration files from that thread it prints a perfect first layer every time.

I'll be curious to see what you find to be the cause. I haven't tried any other slicers yet so that will be my next step.

Re: Strange First Layer after update

Do you have linear advance enabled in your slicer? In the filament section there should be a line similar to M900 K30; PLA Filament gcode M900 K45; PETG Filament gcode

Three things you could try:-

Also what was the version of the firmware you were using before? Knowing which version you were using will help identify what has changed.

Regards,
Martin

Re: Strange First Layer after update

Hi Guys,
that sort of blistered first layer happens because too much plastic is being squeezed into too little space...

likely causes include, :

Incorrect extrusion length, ( reasonably unlikely with prusa printers...)
Incorrect Live Z setting, (too low)
Over extrusion... ( last time I looked, the Slic3r PE standard start G code has a line which adjusts the Flow rate)
M221 S{if layer_height<0.075}100{else}95{endif}

if you are using a home grown Slic3r profile, you may not have taken this into account.

regards Joan

Re: Strange First Layer after update

Just to follow up my problem ended up being a badly warped heat bed. They are sending out a new one. Calibration square and individual smaller prints looked ok but anything bigger I could never get the first layer right.

Hope you get it figured out.