[ELECTRON] Proposed new club + Arduino meet up

Wed Nov 9 20:25:46 UTC 2011

Looking at the options for the electronics, I'm not really sure what path
to go down.  Blair, I know you're a fan of the RAMPS boards, what about if
I make a RAMPS 1.4 board? What are peoples opinions on the best board for
me to go ahead and make?

Tom

On Tue, Nov 8, 2011 at 10:48 PM, Blair Thompson <mail at justblair.co.uk>wrote:

> As I said in my ps.  I have just received a bundle of nuts and bolts, which
> should cover the needs in that department.  I have marked them as on order
> on the RepRap page at goshg.  I should change that to yes when I get a
> chance.
>
> I have also been working on some ABS prints for the printer as well.  I am
> still refining the hole sizes for the bar clamps.  What I have made so far
> is probably useable, but I would be happier if I can get the tolerances
> down
> a little before attempting more critical prints.
>
> I have been using parts from Greg Frost's repository for this as he has a
> more robust looking Y bracket.  I will probably use one of the close but no
> cigar prints to upgrade my own printer.
>
> As for changing nozzles on the fly?  The hot end is bolted into the
> extruder
> (if using a Wades which is the current fashion) with two 3mm bolts.
> Changing the nozzles over is probably going to damage the hot end if done
> frequently, but changing hot ends is certainly possible if fiddly.  If it
> were me I would be tempted to carry two extruder/x-carriage/extruder
> motor/hot-end combos for an easy swap over.  Use a durable connector to
> make
> the electronics easy to swap and Bob is indeed your mammies sister's ball
> and chain.
>
> For what we are hoping to do, sticking with the standard sizes would make
> calibration that bit easier especially if we use the
> Pronterface/Sfact/marlin firmware options.  You can get pretty good prints
> after a pretty simple calibration routine.   It's only when you are trying
> to make mechanical parts that you need more precision.
>
> Blair
>
> -----Original Message-----
> From: members-bounces at electronclub.org
> [mailto:members-bounces at electronclub.org] On Behalf Of Kieran Wyse
> Sent: 08 November 2011 22:29
> To: Discussion list for the Electron Club
> Subject: Re: [ELECTRON] Proposed new club + Arduino meet up
>
> 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=OgUXAAAA
> > EBAJ&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=USPAT5866
> > 058&id=OgUXAAAAEBAJ&o%0Ai=fnd&dq=stratasys+patent+fused+deposition+mod
> > elling&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_ch
> > art.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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