[OpenTRV-dev] Mass box printing

Thu Nov 28 10:13:56 GMT 2013

Maybe we should ask the Pimoroni guys how they mass-produce their pibow? At
the end of the day, they started the same with 3D printed models that they
subsequently productised.

On 28 November 2013 07:28, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:

> Hi
>
> From what I can see 100 is about the cross-over point.
>
> For the trial run many many parts of the system cost far more than they
> would as productised.  What I don’t have is a huge workshop or great
> hand-crafting skills, so paying somewhat over the odds for something that
> (a) we can easily adjust in the way we have already through several
> revisions, and (b) that I do not have to attack with various tools, is
> probably money well spent.
>
> I’d prefer to spend £5 per box for at least the first main run of 30–40,
> and decide what to do thereafter, ie if we do an extended trial run on an
> additional 100.  I do not want to spend 2h on printing each of those boxes
> taking time off work to do so for example (or make Bo do them!).
>
> Rgds
>
> Damon
>
> PS.  With luck our STL or OpenSCAD models can go to an injection moulding
> place for fairly easy adaptation or use as-is.
>
> On 28 Nov 2013, at 06:52, Philip Canavan <EMAIL ADDRESS HIDDEN> wrote:
>
> > If it's that order of cost then is it worthwhile looking into injection?
> I believe there are some low-volume shops designed for prototyping; 100-off
> would presumably be a viable (or even large) order for them. Anyone know
> where the tipping point is likely to be? I'm assuming the current solid
> models can be re-used.
> >
> >
> > From: Damon Hart-Davis <EMAIL ADDRESS HIDDEN>
> > To: Closed list for developer discussions <
> EMAIL ADDRESS HIDDEN>
> > Sent: Wednesday, 27 November 2013, 9:18
> > Subject: Re: [OpenTRV-dev] Mass box printing
> >
> > I do 0.3mm layers; 2h is about right.  Which is why I don’t want to tie
> your life up on mass production.
> >
> > Rgds
> >
> > Damon
> >
> >
> > On 27 Nov 2013, at 08:56, Bo Herrmannsen <EMAIL ADDRESS HIDDEN>
> wrote:
> >
> > > Pronterface says:
> > >
> > > 4631.27473342 mm of filament used in this print
> > >
> > > that is for all 4 layers in one go at best resolution the printer can
> (0.1mm layer hight) print time is an insane 6 hours... at 0.2 mm it would
> be half... and at 0.3mm it would be 2 hours
> > >
> > >
> > > Den 27/11/2013 kl. 08.41 skrev Stuart Poulton:
> > >
> > >> "Most service bureaux charge per unit volume of material used in the
> building of the model, and not the total volume. We like to do it a little
> different…. we charge for the total swept volume of the part, but at about
> a tenth of the cost of the going rate!"
> > >>
> > >> Which seems like a fair way to do it.
> > >>
> > >> On 27/11/13 07:39, Bo Herrmannsen wrote:
> > >>> 90cm3 seems like a lot... does that assume its hollow?
> > >>>
> > >>> /bo
> > >>>
> > >>> Den 27/11/2013 kl. 08.36 skrev Stuart Poulton:
> > >>>
> > >>>> Ok, taking the URL below, and making the following assumptions
> > >>>>
> > >>>> OpenTRV box is ~ 5.5cm x 5.5cm x 3cm
> > >>>>
> > >>>> This gives a swept volume of 90.75 cm3, at 10pence per cm3, total
> price is £9.75 + VAT
> > >>>>
> > >>>> I appreciate that 3d printing is great, but for that sort of price
> I can get a nice case that looks like this
> > >>>>
> > >>>> https://dl.dropboxusercontent.com/u/6014682/IMG_0434.JPG
> > >>>>
> > >>>>
> > >>>> Stuart
> > >>>>
> > >>>>
> > >>>> On 26/11/13 21:26, Bruno Girin wrote:
> > >>>>> I got some prints done by those guys before I had a 3D printer:
> http://www.3dprint-uk.co.uk/
> > >>>>>
> > >>>>> They are based in Brick Lane and the prints are of very good
> quality. The only downside is that they do any colour as long as it's white.
> > >>>>>
> > >>>>>
> > >>>>> On 26 November 2013 17:03, Damon Hart-Davis <EMAIL ADDRESS HIDDEN<mailto:
> EMAIL ADDRESS HIDDEN>> wrote:
> > >>>>>
> > >>>>>    Hi,
> > >>>>>
> > >>>>>    I would like to have a small number of the current OpenTRV box
> > >>>>>    design printed by (say) 2 different organisations in preparation
> > >>>>>    for printing up 40 or more very soon for the trial, to find out
> > >>>>>    who is reliable and produces good prints and is easy to deal
> with.
> > >>>>>
> > >>>>>    Would you like to suggest one or more to test out in this way?
> > >>>>>    Might be commercial or not (eg TVRRUG).
> > >>>>>
> > >>>>>    Rgds
> > >>>>>
> > >>>>>    Damon
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> --
> > >>>>> Bruno
> > >>>>> Visit my weblog: http://brunogirin.blogspot.com
> > >>>>>
> > >>>>>
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-- 
Bruno
Visit my weblog: http://brunogirin.blogspot.com
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