[ELECTRON] Proposed new club + Arduino meet up

[Kieran Wyse]

Once the reprap is built we can certainly thing about enclosing it, it may
well improve build quality. As to the fidelity it does seem just from
visual inspection of the parts printed that the limiting factor seems to be
the size of the nozzle. Which begs the question is there are any way to
change the nozzle size on the fly? If it were possible and I do not know
how I think it would likely turn the reprap into a VERY capable machine.

I have been told that the motors are going to take another 11 days to
arrive. They should be here by the end of the month i reckon. Has anyone
else had more progress than myself?

Kieran.

On 8 November 2011 21:56, Blair Thompson <mail at justblair.co.uk> wrote:

> I have seen other reprap experimenters talking about using enclosures.  I
> for the life of me cant remember whom.  What I do seem to recall was that
> they were using the heated bed as the main heating source for the enclosure
> and then using a temperature controlled fan to maintain the ambient
> temperature inside the case.  I seem to remember a temperature of around
> 40c
> as being in the ballpark as to what was useful.
>
> If I remember quickly, what the experimenters were trying to achieve was
> reduction of distortion in taller models.  Warping occurs sometimes when
> parts of the model at the base cool while those at the top i.e. the most
> recently printed are stil hot.  An enclosure serves to reduce the
> difference
> in temperature from the most recently printed parts of the model to the
> least recently printed.
>
> I have been trying to perfect my machine and have found that fan cooling of
> the filament as it is laid down makes a difference to the quality of the
> prints in either ABS and PLA.  For ABS however I also have to lay a skirt
> which reduces the cooling at the bottom of the model from either my cooling
> fan or from the movement of the Y axis.  I was getting lifts from the build
> plate before I started using the skirt.  I don't know if this will improve
> PLA prints as I have not tried it yet, Imanaged to get good prints without
> it.
>
> The layer thickness you reference for the Reprap of 0.3mm depends on the
> extrusion nozzle aperture width.  With a 0.5mm width and 3mm filament the
> layer thickness works out at about 0.4mm using the sfact software as a
> slicer.  You can get lower by using different filament thickness and
> different nozzle aperture widths.  What you gain in fidelity you lose in
> build speeds though.
>
> One idea I had was to not build the reprap using triangular vertexes, but
> rather to build an MDF cube but use the Prusa dimensions and mechanical
> parts.  This would certainly allow experimentation in terms of retaining
> some ambient heat around the models being created.
>
> Regards
>
> Blair.
>
> Ps  I just got a delivery of various screws and bolts that I needed.  I of
> course ordered a few extras.  All but the M8 washers arrived today.
>
>
>
> -----Original Message-----
> From: members-bounces at electronclub.org
> [mailto:members-bounces at electronclub.org] On Behalf Of Brian Loudon
> Sent: 08 November 2011 21:29
> To: Discussion list for the Electron Club
> Subject: Re: [ELECTRON] Proposed new club + Arduino meet up
>
> Hi to those interested in RepRaps, I came across this patent relating to
> temperature and flow control for professional Fused Deposition Modelling
> systems ;
>
>
> http://www.google.co.uk/patents?hl=en&lr=&vid=USPAT5866058&id=OgUXAAAAEBAJ&o
>
> i=fnd&dq=stratasys+patent+fused+deposition+modelling&printsec=abstract#v=one
> page&q&f=false<http://www.google.co.uk/patents?hl=en&lr=&vid=USPAT5866058&id=OgUXAAAAEBAJ&o%0Ai=fnd&dq=stratasys+patent+fused+deposition+modelling&printsec=abstract#v=one%0Apage&q&f=false>
>
> The stratasys Dimension printers achieve .178 mm, .254 mm or .33 mm layer
> thicknesses,
>
> http://www.dimensionprinting.com/3d-printers/3d-printing-comparison_chart.as
> px
>
> the reprap is quoted as a layer thickness of 0.3
> http://reprap.org/wiki/Mendel
>
> The patent above emphasises the importance of temperature and the
> professional machines all have enclosures, makes me wonder if the reprap
> performance can be optimized?
>
> cheers
>
> Brian
>
>
>
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