<div dir="ltr">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.<br></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On 28 November 2013 07:28, Damon Hart-Davis <span dir="ltr"><<a href="mailto:dhd@exnet.com" target="_blank">dhd@exnet.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi<br>
<br>
>From what I can see 100 is about the cross-over point.<br>
<br>
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.<br>
<br>
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!).<br>
<br>
Rgds<br>
<span class="HOEnZb"><font color="#888888"><br>
Damon<br>
</font></span><br>
PS. With luck our STL or OpenSCAD models can go to an injection moulding place for fairly easy adaptation or use as-is.<br>
<div class="im HOEnZb"><br>
On 28 Nov 2013, at 06:52, Philip Canavan <<a href="mailto:p_s_canavan@yahoo.co.uk">p_s_canavan@yahoo.co.uk</a>> wrote:<br>
<br>
> 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.<br>
><br>
><br>
</div><div class="HOEnZb"><div class="h5">> From: Damon Hart-Davis <<a href="mailto:dhd@exnet.com">dhd@exnet.com</a>><br>
> To: Closed list for developer discussions <<a href="mailto:opentrv-dev@lists.opentrv.org.uk">opentrv-dev@lists.opentrv.org.uk</a>><br>
> Sent: Wednesday, 27 November 2013, 9:18<br>
> Subject: Re: [OpenTRV-dev] Mass box printing<br>
><br>
> I do 0.3mm layers; 2h is about right. Which is why I don’t want to tie your life up on mass production.<br>
><br>
> Rgds<br>
><br>
> Damon<br>
><br>
><br>
> On 27 Nov 2013, at 08:56, Bo Herrmannsen <<a href="mailto:bo.herrmannsen@gmail.com">bo.herrmannsen@gmail.com</a>> wrote:<br>
><br>
> > Pronterface says:<br>
> ><br>
> > 4631.27473342 mm of filament used in this print<br>
> ><br>
> > 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<br>
> ><br>
> ><br>
> > Den 27/11/2013 kl. 08.41 skrev Stuart Poulton:<br>
> ><br>
> >> "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!"<br>
> >><br>
> >> Which seems like a fair way to do it.<br>
> >><br>
> >> On 27/11/13 07:39, Bo Herrmannsen wrote:<br>
> >>> 90cm3 seems like a lot... does that assume its hollow?<br>
> >>><br>
> >>> /bo<br>
> >>><br>
> >>> Den 27/11/2013 kl. 08.36 skrev Stuart Poulton:<br>
> >>><br>
> >>>> Ok, taking the URL below, and making the following assumptions<br>
> >>>><br>
> >>>> OpenTRV box is ~ 5.5cm x 5.5cm x 3cm<br>
> >>>><br>
> >>>> This gives a swept volume of 90.75 cm3, at 10pence per cm3, total price is £9.75 + VAT<br>
> >>>><br>
> >>>> I appreciate that 3d printing is great, but for that sort of price I can get a nice case that looks like this<br>
> >>>><br>
> >>>> <a href="https://dl.dropboxusercontent.com/u/6014682/IMG_0434.JPG" target="_blank">https://dl.dropboxusercontent.com/u/6014682/IMG_0434.JPG</a><br>
> >>>><br>
> >>>><br>
> >>>> Stuart<br>
> >>>><br>
> >>>><br>
> >>>> On 26/11/13 21:26, Bruno Girin wrote:<br>
> >>>>> I got some prints done by those guys before I had a 3D printer: <a href="http://www.3dprint-uk.co.uk/" target="_blank">http://www.3dprint-uk.co.uk/</a><br>
> >>>>><br>
> >>>>> 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.<br>
> >>>>><br>
> >>>>><br>
> >>>>> On 26 November 2013 17:03, Damon Hart-Davis <<a href="mailto:dhd@exnet.com">dhd@exnet.com</a> <mailto:<a href="mailto:dhd@exnet.com">dhd@exnet.com</a>>> wrote:<br>
> >>>>><br>
> >>>>> Hi,<br>
> >>>>><br>
> >>>>> I would like to have a small number of the current OpenTRV box<br>
> >>>>> design printed by (say) 2 different organisations in preparation<br>
> >>>>> for printing up 40 or more very soon for the trial, to find out<br>
> >>>>> who is reliable and produces good prints and is easy to deal with.<br>
> >>>>><br>
> >>>>> Would you like to suggest one or more to test out in this way?<br>
> >>>>> Might be commercial or not (eg TVRRUG).<br>
> >>>>><br>
> >>>>> Rgds<br>
> >>>>><br>
> >>>>> Damon<br>
> >>>>><br>
> >>>>><br>
> >>>>><br>
> >>>>><br>
> >>>>> --<br>
> >>>>> Bruno<br>
> >>>>> Visit my weblog: <a href="http://brunogirin.blogspot.com" target="_blank">http://brunogirin.blogspot.com</a><br>
> >>>>><br>
> >>>>><br>
> >>>>> _______________________________________________<br>
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> >>>>> <a href="http://lists.opentrv.org.uk/listinfo/opentrv-dev" target="_blank">http://lists.opentrv.org.uk/listinfo/opentrv-dev</a><br>
><br>
> >>>> _______________________________________________<br>
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> >><br>
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> ><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Bruno<br>Visit my weblog: <a href="http://brunogirin.blogspot.com">http://brunogirin.blogspot.com</a>
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