[ELECTRON] Proposed new club + Arduino meet up

Blair Thompson mail at justblair.co.uk
Wed Nov 9 22:36:10 UTC 2011 

Hi Tom

I can't say that I am totally a ramps fanboy.  I favour it for a couple of
reasons though...

1.  I know it (yep that is the main reason)
2.  SD support
3.  Good support from the firmware point of view.  (ie Marlin, Sprinter,
etc.)

There are others though and some may be easier to manufacture.  Sanguinololu
I believe can be made to operate from SD.  I would have to check to see what
firmwares it can support.

As for ramps 1.4  If you enjoy working on surface mount stuff this is one
route to go.  Ramps 1.3 is through hole and has as far as I can tell all the
relevant features...


-----Original Message-----
From: members-bounces at electronclub.org
[mailto:members-bounces at electronclub.org] On Behalf Of Thomas Parry
Sent: 09 November 2011 20:26
To: Discussion list for the Electron Club
Subject: Re: [ELECTRON] Proposed new club + Arduino meet up

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=OgUXAA
> > AA
> > EBAJ&o
> >
> > i=fnd&dq=stratasys+patent+fused+deposition+modelling&printsec=abstra
> > ct
> > #v=one
> > page&q&f=false<http://www.google.co.uk/patents?hl=en&lr=&vid=USPAT58
> > 66 
> > 058&id=OgUXAAAAEBAJ&o%0Ai=fnd&dq=stratasys+patent+fused+deposition+m
> > od 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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