[OpenTRV-dev] Mass box printing

Thu Nov 28 07:28:52 GMT 2013

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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