First layer AFTER raft is printing too fast!

[CompoundCarl]

It isn't any thicker. Look at the actual extrusion amounts from the E-commands. It's the same thickness as the others, it's just raised due to your raft separation distance setting.

[dkightley]

I think the reported issue here is related to...or is the same issues in a different guise...as the subject of this thread:
viewtopic.php?f=9&t=3246&hilit=raft+separation

A change was made in v3.0 to try and resolve issues with separation, but it has caused more issues than it resolved.

[sonderzug]

Hi all,

I registered to take part in this discussion --> first post, hey there.

I use S3D with a first generation Ultimaker and have recently been able to add a second extruder. Now I am happily dual-extruding away, but have quickly encounterd the same issue as the OP.
I can confirm all of the remarks, the first layer is shown dangerously green in the build preview (printing speed).

As of now I helped myself by overriding the printing speed at the end of the top raft layer, reducing printing speed to 50%. At a base speed of 55 mm/s (give or take 5, depending on the printer's mood of the day) this seems to work reasonably well. However this requires me babysitting the printer through the first 10 minutes of each print.

Best regards,
Niklas

[BimmyBot]

Hi, I'm also having this issue. I see there's no solution, yet, but I want to keep this thread active. I'm new to 3d printing, and Simplify is the only program I've used, so pardon me, if I don't know all the tricks, yet.

I'm not afraid to learn some g-code. I've figured out some of the basics, already (editing the start sequence, for example,) but if I have to edit the individual part's g-code, every time I export a different model, I'll pull my hair out. Can I edit the layer change script to only slow down the print speed for the layer after the raft, and then resume the model, as usual?

Thanks
BimmyBot

[col55]

has anyone solved this problem as this is a pretty much software killer for me, i don't mind doing 2 processes but how do you set a process for raft and process for object as they are set due to layer height. would you set it to a minus figure say. and if so would you set it to the number of layers multiplied by the layer height ? as not sure if layer height for raft is set at a standard or weather its the same as the object.
well any help would be great other wise this software is useless to me as i have to print to raft every time.

[manox]

I didn't solve the issue yet. Using two processes doesn't work for me because the start and stop heights doesn't seem to include the raft. I really don't know why the developers don't address the problem. I think my future solution would be a small program editing the g-code before printing. I'll try that end of may, when i hopefully have some time.

[pbmax]

I've run into the same problem - first part layer on top of the raft goes full blast. I also couldn't easily get 2 processes lined up properly to go super slow with the raft to work around the issue; the layers just didn't match up right. It wasn't worth my time to try to get it lined up right as post-processing is far more straight-forward.

As to the thickness issue, I don't see that. There's supposed to be a gap between the first part layer and the raft, so maybe that's making it look thicker?

My issue is the print head moving far faster than it should be with no cooling overrides or anything applied; the g-code comments indicate that it's treating the whole first layer above the raft as inner perimeter. After printing the first layer at 60mms the cooling overrides kick in for subsequent layers making the speed about 16mms for part layers 2+ on a print I did this morning (a vertical tube). Thankfully the print came out okay.

SIMPLIFY3D SUPPORT: PLEASE FIX THIS!!

[Rebekah_harper]

I have also realised this problem.

I, like others, have raised this.

I have asked for them to separate the part from the raft. they asked for a demonstration and examples.

am hoping they will resolve this because its daft that the first layer settings aren't related to the part and hence pointless if you use a raft.

I have my fingers crossed on this one.

[Rebekah_harper]

hiya,

I have found the only true solution to this first layer problem is to edit the G-Code.

You will find that the first layer is set at 100% speed in mm/minute.

it's layer 5 with raft layers set to 1.

I save the G-Code to a special folder and from there I open with notepad. under edit I use find F6000 for example. this tends to get me quickly to the 5th layer.

I then change the innner and outer to F1500. Just check for the following:

G1 X127.922 Y131.607 E13.4466
G1 X128.835 Y132.126 E13.4604
G1 X128.856 Y132.137 E13.4607
G1 X129.759 Y132.559 E13.4738
G1 X137.018 Y134.504 E13.5725
G92 E0
G1 E-4.0000 F3000
G1 Z2.045 F4002
; layer 5, Z = 1.84519
M106 S255
G4 P500
M106 S102
; tool H0.306 W0.410
; inner perimeter
G1 X136.510 Y133.236 F6000
G1 Z1.845 F4002
G1 E-0.0300 F3000
G92 E0
G1 X135.688 Y133.121 E0.0154 F1500 (THIS LINE)
G1 X134.870 Y132.973 E0.0308
G1 X134.060 Y132.793 E0.0463
G1 X133.259 Y132.582 E0.0616
G1 X132.465 Y132.337 E0.0771
G1 X131.680 Y132.061 E0.0925
G1 X130.908 Y131.755 E0.1079
G1 X130.148 Y131.418 E0.1234

A good indicator is the fact that an extrusion value is listed. Just make sure you scroll through the code and look for these lines. once you reached Layer 6 you're done, then save and either press play and select the file of do a send to and select the SD drive.

hope this is helpful for someone.

[InoTek3D]

I'm having this same problem. I can't believe there isn't a solution to this in the software yet without having to get into the GCode and manipulate it.

We need a fix to this!!