[Lab] 3D printed piece

James Allanson james.d.allanson at gmail.com
Thu Nov 29 02:19:10 EST 2012

Hi Franck,

I usually go by 2 values when I'm designing pieces to fit together.
 Usually a tolerance of 0.05mm for a tight fit and 0.1mm for a looser fit.
 So if your need your cylinders to be 4.5mm, try anything from 4.55mm to

I don't know know the exact specs of the Cupcake, but that minimum detail
size isn't outside the realm of DIY or kit 3D printers.  If you send me
your STL I can pop it into a slicer and let you know how it would turn out.

On Mon, Nov 26, 2012 at 10:06 AM, Franck Binard <franckbinard at gmail.com>wrote:

> Hello,
> As part of my current project, I'd like to build a small plastic fastener
> to fit the parallax continous rotation servo (see dimensions here:
> http://www.parallax.com/Portals/0/Downloads/docs/prod/motors/ServoDimensions.pdf
> ).
> I've never 3d printed anything before. The fastener system includes  small
> cylinders meant to go through the 4 small holes to both ends of the servo
> (diameter 4.5mm).
> Question: how big should the cylinder be in order to fit snug (a bit like
> lego prongs). My current design has them at exactly 4.5mm, but I'm thinking
> that there might need to be a couple of fractions of mm of buffer,
> otherwise the prong might be too big and not fit through the whole.
> I was thinking of getting the fastener printed by ponoko out of their
> "durable plastic material" which they specify has a Minimum Detail Size of
> 0.6mm (
> http://www.ponoko.com/make-and-sell/show-material/237-3d-printed-durable-plastic
> ). I might also try to do it using the printer in the modlab, but i'm not
> sure how that works (do I have to get permission, what times should I come
> and do it at, things like that)
> Any advice, most welcome, thanks
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