http://www.shapeways.com/forum/index.php Shapeways: Bring your creativity to life in 3D http://www.shapeways.com/forum/index.php?t=rview&goto=45614&th=8612#msg_45614
I plan to get a prototype part for an RC Car printed soon, in WSF, and I had a question regarding the strength of the material.

The WSF parts are porous, so it wouldn't be as strong as say a solid extruded bar of the same material, so it matters whether the data of the material are from a solid bar or from material samples that were actually produced with an SLS printer.

I read through the datasheet, but to me it's not completely clear whether the tensile strength is of the material itself, or the material when processed through the SLS process. So does anyone know this?

PS: Here are some images of the part - it's a block to which a suspension arm mounts on a Tamiya Dyna Storm.




]]> Origineelreclamebord 2012-03-17T10:49:46-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=45615&th=8612#msg_45615 stonysmith 2012-03-17T11:49:05-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=45644&th=8612#msg_45644
My worries however are in regard to the fact that there is actually slightly less material in the 3D printed part compared to the same model being molded, machined or printed with an FDM printer because it's porous. Hence my question whether the production method has been taken into account in the material data sheet or not.

I could ask EOS, the supplier of the material, but I contacted them before about other stuff but never got a reply, hence why I am trying to find answers elsewhere.]]> Origineelreclamebord 2012-03-18T08:45:00-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=45664&th=8612#msg_45664
You should visit EOS page, they have the specifications for the PA2200 fused using different settings. But you will have to guess with one SW really uses and in which orientation each run is done.]]> stannum 2012-03-18T20:11:50-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=45665&th=8612#msg_45665 As for the actual strength, if I model everything going by the 'worst' numbers, then I guess everything should be allright! ]]> Origineelreclamebord 2012-03-18T20:25:23-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=46433&th=8612#msg_46433

Here are the official assembly instructions There is an option to use low profile/thin nyloc nuts, which means 12mm screws may be good enough (I haven't been able to measure it yet). With normal nyloc nuts 14-15mm is enough.

Progress by 29-03-2012:
Here is the first picture of the printed blocks:


Progress by 03-04-2012:












The parts needed slight modding: The holes were slightly too small for the bushings, and the length of the piece in which the bushings sit was slightly too long. Other than that, the fit is just as good as the original part! I hope to start testing this week.]]> Origineelreclamebord 2012-04-04T07:23:08-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=46463&th=8612#msg_46463
I recommend that you investigate the following resins:

1. DuraForm HST
2. PA 640-GSL

These resins contain fiber glass and carbon fiber reinforcement respectively. Inclusion of these fibers dramatically increase the final product's ability to manage dynamic loads as well as prevent crack propagation.

These resins are commonly used in aerospace parts that also must handle dynamic loads.]]> Tamert 2012-04-04T18:44:47-00:00 http://www.shapeways.com/forum/index.php?t=rview&goto=46465&th=8612#msg_46465 Origineelreclamebord 2012-04-04T19:06:45-00:00