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Size misprint 43mm => 41.6mm [message #40723] Sun, 25 December 2011 00:20 UTC Go to next message
avatar pongstak1  is currently offline pongstak1
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Registered: October 2011
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I've been happily 3D printing for months (thank you, Shapeways). All my printed parts matched the uploaded STL in dimensions. However, I just got a part that doesn't match the uploaded STL. It is too small (41.6mm vs 43mm). This is sad for me because my 36mm printed circuit board doesn't fit in the shrunken 35mm space of the printed 3D case. My first thought was that I might have uploaded improper STL (e.g., mistyped scaling as 24.5 vs. 25.4). However, I downloaded the STL to verify dimensions: http://www.shapeways.com/model/edit/367832/
NetFabb reports the length as 43mm, but the 3D part is 41.6mm. This leaves me with a useless part and some concern about what happened. In particular, I would appreciate advice on how to prevent this in the future.

Help,
Karl


pongstak1
Re: Size misprint 43mm => 41.6mm [message #40796 is a reply to message #40723 ] Tue, 27 December 2011 14:57 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Karl, what material did you use? I know stainless has a high tolerance. If you ordered in any of the plastic materials or silver, I'd email service@shapeways.com with pictures, order number, and a description of what is wrong as their tolerences are tighter and shouldn't have that big of a difference.


The Mad Moder
michael@shapeways.com
Re: Size misprint 43mm => 41.6mm [message #40800 is a reply to message #40796 ] Tue, 27 December 2011 16:10 UTC Go to previous messageGo to next message
avatar pongstak1  is currently offline pongstak1
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Thank you, 4eva. I will email support directly with particulars.

The material used was WSF plastic, which normally has sub mm tolerances. In this particular print the scale on all three dimensions was off with a cumulative error of 1.4 mm. Another piece in the same order came out fine. Very strange.

I will report back to forum with more info as it becomes available.


pongstak1
Re: Size misprint 43mm => 41.6mm [message #40885 is a reply to message #40800 ] Thu, 29 December 2011 12:09 UTC Go to previous messageGo to next message
avatar Texel2001  is currently offline Texel2001
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My batch is allso way off. $130 down the drain!!!
http://www2.picturepush.com/photo/a/7243450/800/Shape-parts/PC294586.jpg
Re: Size misprint 43mm => 41.6mm [message #40887 is a reply to message #40723 ] Thu, 29 December 2011 13:41 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Texel, your image isn't working


The Mad Moder
michael@shapeways.com
Re: Size misprint 43mm => 41.6mm [message #40888 is a reply to message #40887 ] Thu, 29 December 2011 13:57 UTC Go to previous messageGo to next message
avatar Texel2001  is currently offline Texel2001
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better?

Im in the process of checking the measurements.

First impression is that x and y are about 5% to small.

Will post more later.index.php?t=getfile&id=13006&private=0



  • Attachment: PC294586.jpg
    (Size: 278.89KB, Downloaded 164 time(s))

Re: Size misprint 43mm => 41.6mm [message #40889 is a reply to message #40723 ] Thu, 29 December 2011 14:18 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Make sure you email service@shapeways.com, they will get you fixed up.


The Mad Moder
michael@shapeways.com
Re: Size misprint 43mm => 41.6mm [message #40890 is a reply to message #40889 ] Thu, 29 December 2011 14:22 UTC Go to previous messageGo to next message
avatar Texel2001  is currently offline Texel2001
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Sure i will. Ill even drive up to them as i live, relativly, close to Eindhoven.
Re: Size misprint 43mm => 41.6mm [message #40896 is a reply to message #40800 ] Thu, 29 December 2011 17:28 UTC Go to previous messageGo to next message
avatar pongstak1  is currently offline pongstak1
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Well, this is embarrassing. I can't find the part to take the pictures that support@shapeways.com requires. I fully blame the new kitten, who is really into Shapeways soccer.

index.php?t=getfile&id=13007&private=0

Anyhow, yes. As 4eva mentioned, the process is definitely to take pictures of the misprint alongside a ruler for dimension verification. Apparently WSF misprints do happen. That surprised me, since the previous 11 parts ordered were absolutely perfect and insanely accurate.

I did make the suggestion that Shapeways should consider giving customers an option to pay a little extra for "high-accuracy WSF." I would pay the premium for the up-front guarantee of accuracy. That proposed option makes more sense to me than playing accuracy roulette.

Karl

[Updated on: Thu, 29 December 2011 17:38 UTC]


pongstak1
Re: Size misprint 43mm => 41.6mm [message #40899 is a reply to message #40896 ] Thu, 29 December 2011 17:49 UTC Go to previous messageGo to next message
avatar pongstak1  is currently offline pongstak1
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Oh. Here's another thought...

If you're ordering interlocking parts with high tolerances that do not require "real-world accuracy" but do require "self-consistent accuracy" (e.g., a model to assemble), it might make sense to put all the parts together in the same upload so that they would still fit together independent of shrinkage (presumably because they would all be part of the same print).

In my case, I did order two parts in the same order, but one was WSF and the other was ISF. The indigo part was perfectly accurate, but the white part wasn't. The color-change setup put the ISF part in a separate print than the WSF part, which meant that the WSF shrinkage resulted in two parts that should, but don't fit together.

Karl


pongstak1
icon13.gif  Re: Size misprint 43mm => 41.6mm [message #40900 is a reply to message #40899 ] Thu, 29 December 2011 18:00 UTC Go to previous message
avatar Texel2001  is currently offline Texel2001
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To be sure Shapeways could deliver relatively accurate parts i designed a test-object to test for accuracy.

I ordered in BSF and RSF both where spot on.

So i thought i could order some large objects for my project.

5% off is way to much!

I contacted service and waiting for a reply.


index.php?t=getfile&id=13011&private=0


 
   
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