[Arm-netbook] SPI-based LCDs, 3D printing, RISC-V

[Peter Carlson]

Having just got into 3D printing myself I would suggest it is not yet a
plug and play experience yet. Although the printer I got was very
definitely a DIY project requiring assembly etc. the groups I am following
also suggests to me that quality is very definitely an acquired skill that
comes through experience. I had thought of volunteering my printers to
complete the process for this project but I am not certain that my printing
is up to the quality standards and as such I am not sure that I would want
the stress of trying to turning out a product that I may not be experienced
enough to do. I would think the only way to do a crowd source printing
would require getting sample prints from each participant for evaluation. A
process that would be quite time consuming I think. One mans' opinion.

On Thu, Apr 27, 2017 at 9:16 AM Adam Van Ymeren <adam at vany.ca> wrote:

> On April 27, 2017 9:23:40 AM EDT, Luke Kenneth Casson Leighton <
> lkcl at lkcl.net> wrote:
> >On Thu, Apr 27, 2017 at 1:00 PM, Christian Kellermann
> ><ckeen at pestilenz.org> wrote:
> >
> >> As the current issue is time in producing them I would also scratch
> >> the printed parts order myself, maybe in exchange for a discount on
> >> future designs done by Luke and print them myself. People with access
> >> to a maker lab could consider doing the same...
> >>
> >> I am not capable to promise good quality printing for 3rd parties as
> >I
> >> have been starting getting into this for a rather short while now...
> >
> > well, a 200x200 basic reprap will do the job, with a 0.4mm nozzle and
> >a layer height of between 0.15 and 0.2mm is absolutely fine.  it's not
> >hugely difficult.  i've just ordered this ($140!!) 3D printer from a
> >taobao seller, it's arriving in a couple of days:
> >
> > https://world.taobao.com/item/526287577504.htm
>
> Here's a thought, if you're okay running a fleet of printers, what if we
> crowd funded a fleet of 3d printers, whereby people pay for printers, you
> do a bulk order of printers, use them to print the parts and then
> distribute the printers to backers.  Sort of like a promotional thing, you
> can receive one of the printers that was used to make your laptop.
>
> >
> >now, at $140 i am quite happy to get up to 10 of those (if the first
> >one checks out fine) - it looks *really* sturdy: 20x20 aluminium
> >box-section: my only concern about rigidity being that it uses
> >L-brackets which go *into* the frame rather than triangle-corners
> >which are bolted outside and lock the box-section absolutely solid.
> >but, we'll see what happens.
> >
> > also it looks like it has a clone of the E3Dv6 hot-end (which is
> >really good), it has trapezoidal z-axis lead screws with proper brass
> >nuts, borosilicate glass plate (to be confirmed).
> >
> > the one thing i have told the guy (and he's happy to give a RMB 70
> >discount): i do NOT want the f*****-s***-for-brains RAMPS 1.4
> >controller.  if you're familiar with 3D printing for f***'s sake STAY
> >AWAY from ANYTHING that uses the brain-dead "Polulu" driver "modules".
> >RAMPS, RUMBA, Lerdge, Megatronics - just don't f*****g well do it.
> >
> > the reason is really really simple: those QFN ICs are designed
> >SPECIFICALLY, as outlined CLEARLY IN THE DATASHEET, for the heat to be
> >dissipated THROUGH THE PCB.  there is a ceramic insulator on the TOP
> >OF THE CHIP which ACTIVELY PREVENTS HEAT DISSIPATING THROUGH THE TOP.
> >if you put a heat sink on top of the chip it does... nothing.
> >
> > now, when the first reprap was created, in order to save time and
> >development cost they bought some PROTOTYPING boards with the stepper
> >drivers pre-mounted, which came with SPECIFIC instructions "under no
> >circumstances use these in production".
> >
> > so what happens?
> >
> > well, they (a) burn out (b) overheat (c) stop working for a couple of
> >seconds at a time in the middle of a print...
> >
> > ... you get the general idea.
> >
> >so anyway i ordered a Melzi 2.0 from here:
> >
> >https://www.aliexpress.com/store/group/Melzi-board/1757194_500507171.html
> >
> >and it turns out that on the reprap wiki there's a mod to them which
> >allows for the connection of a BT UART.  it would have been handy if
> >those pins had been brought out on a header but hey, what's wrong with
> >a bit of soldering.
> >
> >if you don't want to do soldering then you can just put the Melzi 2.0
> >into "auto-load" mode, drop a file in a FAT32 filesystem on a MicroSD
> >card and power it up.
> >
> >i like the Melzi 2.  it's simple, relatively low-cost compared to some
> >of the other options, no-nonsense and straightforward.
> >
> >l.
> >
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