Simplify3D User Forum

First layer width does exactly what it sounds like - it adjusts the width of the extrusions used for the first layer. If the extrusions are wider, they will need to be further spaced apart as well. This is very easy to verify in the preview. Just change first layer width to 200% and you will see that they are spaced twice as far apart.

I have been struggling to get consistent prints. This info has helped a great deal. Thanks

Thanks OP!
So if I understand correctly:

1. First Layer Height <100% does not reduce extrusion amount accordingly (i.e., it will produce a somewhat "squashed" first layer);

2. First Layer Height >100% does increase extrusion amount accordingly (i.e., will produce a taller, but not squashed first layer);

3. First Layer Width >100% increases extrusion amount and line spacing accordingly (i.e., will produce wider, but also wider spaced first layer lines).

Do I have that right?

For all, who need a precise first layer and want to print small details in the range of <1mm, e.G. small letters of a name plate filled with another colour and you don't see any details in your print....:
First check if your Extrusion multiplier (tab Extruder) is ok for the other layers, no over or under extrusion? If not, correct it....
Then check the first layer settings:
Open your profile, open tab called Layer, you have to deal with:
First Layer Hight ( start with 100%)
First Layer Width ( start with 100%)
First Layer Speed ( start with 40%)
Start a print of just the first layer.
You see too much plastic, no details, a rough surface?
Increase the distance between the bed and the nozzle:
(Level the bed a bit lower) or
Modify the z offset of your printer firmware or
Modify the Start G code script under the tab Scripts in the profile
Make a few test prints with different Z offsets and take the best...
You see ropes of plastic separated from each other
reduce layer hight till it fits or
level the bed a bit closer to the nozzle
Modify the z offset of your printer firmware or
Modify the Start G code script under the tab Scripts in the profile

Check if the Speed has an influence on the result. Does 10% First layer speed looks much better?

Unfortunately there seems no other way in S3D to correct over extrusion just for the first layer or did I miss something? It took me hours to understand that........
Maybe this is helpful for someone.....

First Layer Speed: Slows down the First Layer Speed to a percentage of your Default Printing Speed (Other tab)

I just found out an important caveat to this. Your first layer print speed will me the HIGHER of these two values:

• (Layer Tab > First Layer Speed % )*(Other Tab > Default Printing Speed)
• (Cooling Tab > Allow speed reduction down to %)*(Other Tab > Default Printing Speed)

This has been confirmed by tech support and my testing.

-Chuck
NYC 3d guy

this is really good post, thank you for sharing this information with us