On April 27, 2017 11:36:30 AM EDT, Peter Carlson petercarlson79@gmail.com wrote:
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.
This is why I was thinking of letting Luke do the printing and order of printers, just having the crowd put up funds for the purchase of printers, which the backers would receive the printer after the laptops have shipped.
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@vany.ca wrote:
On April 27, 2017 9:23:40 AM EDT, Luke Kenneth Casson Leighton < lkcl@lkcl.net> wrote:
On Thu, Apr 27, 2017 at 1:00 PM, Christian Kellermann ckeen@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:
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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