[OpenTRV-dev] Mass box printing

Thu Nov 28 10:26:24 GMT 2013

Wasn't it laser cut in slices ? I seem to remember them buying a bigger,
better laser on the strength of the orders.

On Thu, Nov 28, 2013 at 10:13 AM, Bruno Girin <EMAIL ADDRESS HIDDEN> wrote:

> 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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