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holes and tubes [message #5736] Fri, 07 August 2009 21:58 UTC Go to next message
avatar stefanharjes  is currently offline stefanharjes
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Registered: May 2009
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Junior Member
Hi all,

I am having trouble with tunnels in white strong & flexible. If I print tunnels with .45mm diameter (which should give a hole with respect to the 0.2mm precision), they resolve (second try) to a depth of maximal 3-4mm. Deeper in the material they do not exsist any longer (we cut it open). Has anybody experience which minimal tunnel diameter to use for long tunnels ~ 2cm lenth? I think these parameter would also belong into the materials sheet...

Best wishes

Re: holes and tubes [message #5737 is a reply to message #5736 ] Sat, 08 August 2009 05:35 UTC Go to previous messageGo to next message
avatar Ushanka  is currently offline Ushanka
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Registered: April 2009
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Junior Member
Do you have some photos? I'd like to see exactly what you mean.

You probably already checked this, but are you sure it's not unused build powder that got lodged in there?
Re: holes and tubes [message #5754 is a reply to message #5736 ] Mon, 10 August 2009 02:24 UTC Go to previous message
avatar crsdfr  is currently offline crsdfr
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Registered: August 2009
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Junior Member
I can't speak for Shapeways here, but as an SLS operator I'll try and explain in simple terms why your hole hasn't resolved well.

SLS shrinks. There's no avoiding that. Obviously there's a scale factor involved (2-4% depending on axis, material, alignment of jupiter with my little toe, etc) which the SLS operator has programmed into the build, but there's also an offset factor, to combat shrinking wall sections and powder granule size and other stuff I can't remember. This offset will be around 0.2mm on both the X and Y. Its not as simple as this, one has to also take beam diameter into account, but the gist here is your hole is actually being built smaller than it should be, and its entirely possible the unsintered material inbetween has heated to the point where it has solidified.

Your best bet in trying to achieve holes this small is drilling them - it will be of a far finer tolerance that way.

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