Raft settings in Cura

[kristoffer 2]

So I print a lot of organic looking structures, mostly proteins which need support structures.

I have a lot of problem with the new raft in the later versions of cura.

The 14.03 worked fine, and gave 2 layers of raft on which the support structure and the object itself were printed on.

The later versions 14.09 use the wide spread first layer, then a very fast printed layer printed close together.

The first layer sticks to the bed with no problems, but the second gets stuck to the extruder and leaves holes.

Next there is 2 more layers, which barely sticks to the second layer.

The overall construction is loose and unstable.

The first part of my prints does not stick and usually breaks of.

The optimal solution for me is only 2 layers, printed slowly and with the lines close together.

How can I do this?

 

[ultiarjan 1,223]

I don't realy picture your issue, but I believe there's a lot of agreement in this forum to use Meshmixer to create support structures for more organic prints.

here's some more info;

http://umforum.ultimaker.com/index.php?/topic/3880-meshmixer-20-a-better-way-to-generate-support/

 

[kristoffer 2]

So what I mean is, that the second layer on the raft is printed too fast using the newest version of Cura.

Is it possible to adjust the print speed, in order to make it print the raft slower. (Other than manually adjust the speed)

 

[Daid 306]

So what I mean is, that the second layer on the raft is printed too fast using the newest version of Cura.

Is it possible to adjust the print speed, in order to make it print the raft slower. (Other than manually adjust the speed)

 

That... sounds more like a bug from my side.

 

[kristoffer 2]

I like the support design with lines, but they just need to be supported properly by the raft.

I tried using the brim instead, putting down 25% extra layer line width for the initial layer. This helps the raft stick better, and eventually hold the support better.

The first support layer is horizontal lines whereas the rest is vertically (As viewed from above)

It works, but the part of my print that do not rest on the support structure is printed directly on the platform, giving some instability when printing these parts (Usually small rounded edges of the whole stucture)