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Wall Thickness/ Detail Thickness/ Relief Height??

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Wall Thickness/ Detail Thickness/ Relief Height?? [message #30219] Tue, 05 July 2011 12:26 UTC Go to next message
avatar 6axlepwr  is currently offline 6axlepwr
Messages: 0
Registered: June 2011
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Junior Member
I have a few questions I hope someone can answer about designing a part to be built with FUD.

At what point does Detail Thickness become Wall Thickness?

For instance. I am designing a part that has a detail that protrudes from both ends of the body about .5mm to .66mm. It is sort of like a shelf bracket. Would I have to consider this a wall thickness detail or a detail thickness detail? It would be great if I can make it the Detail Thickness.

I guess to break down my question into a simple question is to ask how do I know what needs to be considered WALL THICKNESS and what needs to be considered DETAIL THICKNESS?

Next question is what is the minimum relief height a detail can be? meaning what is the minimum height a detail can rise above a flat surface?

Thanks for any help here.

Re: Wall Thickness/ Detail Thickness/ Relief Height?? [message #30220 is a reply to message #30219 ] Tue, 05 July 2011 12:44 UTC Go to previous messageGo to next message
avatar bitstoatoms  is currently offline bitstoatoms
Messages: 5
Registered: March 2009
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Hi Brian,

It sounds like the small extrusion would be considered a detail, it is hard to be certain from the description, depending on what the protrusion is in relation to.

.1mm is the smallest extruded detail visible on a flat surface.


Good luck

Duann Scott

Re: Wall Thickness/ Detail Thickness/ Relief Height?? [message #30253 is a reply to message #30220 ] Tue, 05 July 2011 22:11 UTC Go to previous message
avatar GWMT  is currently offline GWMT
Messages: 1
Registered: February 2011
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Hi Brian;

Reece James came up with a good rule of thumb in this thread:

http://www.shapeways.com/forum/index.php?t=msg&th=1529&a mp;start=40&

Scroll down about a third of the way on the page. If a surface feature extends outward from the surface less than the minimum wall thickness for your material it is a detail. If it extends farther than the minimum wall thickness it's a wall and cannot be thinner than the minimum wall thickness.

To translate his rule to FUD - the minimum wall thickness is 0.3mm so any part extending outward from the surface must be a minimum 0.3mm thick if it extends more than 0.3mm from the surface.

Let's say you want to add raised lettering 0.2mm wide to the surface of your FUD part. The lettering could be no higher than 0.3mm. If it was 0.4mm high it would be considered a wall and the lettering would have to be made 0.3mm wide (the minimum wall thickness for FUD).

Your 0.5mm and 0.66mm protrusions would be considered walls because they extend farther than 0.3mm from the part and must be 0.3mm thick.

You could chamfer down the last 0.2-0.3mm of your protrusions to less than 0.3mm (like the blade of a knife) to achieve a thinner outer edge than 0.3mm.

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