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Adding raft causes print to be .5mm tall after removing raft

Posted: Wed Jan 23, 2019 11:08 pm
by DLrocket89
Hi everyone,

I just started using S3D at home and liked it so much I switched it over at our lab at work too. I have one main issue...less of a deal at home, more of a deal at work. Whenever I/we print with a raft, the part ends up being about half a mm tall in the Z axis. If I print the part without the raft, it's dead nuts on correct Z axis height. It does this with my Monoprice Maker V2.1 at home, and Ultimaker 3 and Ultimaker 2+ at work.

I'm assuming there's some sort of simple setting I need to adjust, can't find it though.

Ideas?

Thanks!

Dustin
Port Washington, WI

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Sat Jan 26, 2019 4:50 am
by ViperZ
How have you set the following parameters?
Additions-Use Raft-Separation Distance

A posting of a FFF configuration file will acquire a better information.

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Sat Jan 26, 2019 6:05 pm
by DLrocket89
I'll post an fff on monday when I get back to work. Also, I designed a z-axis calibration block, 7 steps with one at every 10mm. I'll be able to measure it Monday morning, will post results then.

My settings at home, that offset is .14mm, at work it's something like .35mm.

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Tue Jan 29, 2019 9:46 am
by DLrocket89
Measured the step block I printed. Every z axis measurement is .4mm long with a raft, spot on without the raft. The Separation Distance in the raft settings is .4mm, so I'm guessing that the issue is coming from that setting.

Is there anything we can do to fix that added height?
IMG_20190129_084041059 resize.jpg

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Tue Jan 29, 2019 8:07 pm
by ViperZ
無題.jpg
無題.jpg (15 KiB) Viewed 3561 times
Please adjust by Z Offset. The error of size will become small.

無題.jpg

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Wed Jan 30, 2019 5:21 am
by horst.w
What ViperZ has written may help for the moment, but it is surely not the solution!

I have tested it with 2 steps on a 10 mm - object at 3 mm and finaly 10 mm.

Layer Height 0,20 mm - without raft
3 mm = 15 layers
10 mm = 50 layers
same with raft
raft = 5 layers, in the print preview Z = 1,917 mm / expected 1 mm (diffence may be caused by the settings of raft)
3 mm = 20 layers (15 + 5) Preview Z = 5,057 mm / difference absolut = 3,14 mm ( cause by +/- 1 layer to print yes or no; parts of layers are not possible)
10 mm = 55 layers (50+5) Preview Z = 12,057 mm / difference absolut = 7,00 mm
Height total 3,14 mm + 7,00 mm = 10,14 mm total of 10,00 mm
desired value.

So I guess, there is an other reason to look for!

horst.w
GER
Druckhoehe.png

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Wed Jan 30, 2019 9:31 am
by ViperZ
>Z = 1,917 mm
>Z = 5,057 mm
>Z = 12,057 mm

What did you ask for these values ​​from?

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Wed Jan 30, 2019 12:43 pm
by horst.w
Have a look to the pic,
left corner down inside the printtable at the background, has not much contrast.
But can be read out also in the GCode-file, search to the number of the related layer.

H.

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Wed Jan 30, 2019 7:51 pm
by ViperZ
Can you post a factory file?

Re: Adding raft causes print to be .5mm tall after removing raft

Posted: Thu Jan 31, 2019 5:16 am
by horst.w
... this one.
It's a factory for my Anet A 8, settings with raft.

S3D V 4.1.1


H.

If there are any doubts about the measures , here are the concrete dates measured with a caliper gauge
20190131_133830.jpg
20190131_133855.jpg
The printed part - printed without raft - has 3,18 - 3,20 in the middel and on front side 3,30 mm. The height finaly has 10,20 mm May be caused by a light overextrusion I have set to make it stronger. It is a tool to my lathe.