[Arm-netbook] 3D printing requirements

[Vincent]

Hi Luke,

I saw your recent update on crowdsupply. Could you please list the
specific requirements you need for 3d printing? Otherwise it will be
difficult to help you out.

Ideally, you can provide us with the following data:
- maximum print dimension in width X length (e.g., 200x200mm)
- minimum wall thickness (e.g., 1mm)
- smallest detail (e.g., 0.3mm)

Also, having a single component of the casework as a sample print could
be helpful (meaning: if this prints OK, we would expect that all the
other components are of equal quality).

I value your quality-first approach and do not want to settle for less.

We have a couple of decent 3dprinting suppliers in Germany which I did
use in the past (though, for tiny objects only). I could offer to get
quotes from them and/or do some negotiating. Also, check their quality
based on the sample component to print (which I could also send to you).

Another approach could be to distribute the load: There are many
hacker/maker spaces around the world. Many of them do have 3d printers
and offer printing at much cheaper rates. I do have good friends at a
maker space with an Ultimaker 2+ and most of the time the printer is
idle. Since they are a registered voluntary association, they are always
interested in receiving minor donations in return for services.

I could ask them to print a couple of cases?

Another idea:
How about buying 10 Ultimaker+ and selling them via crowdsupply as part
of the EOMA68 campaign (with a reasonable deduction, due to the reason
being used)?

You did address PLA a couple of times. How about the resin option? Any
specifics? How many people ordered it?


Cheers,
Vincent



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[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

Post by Vincent
Hi Luke,
I saw your recent update on crowdsupply. Could you please list the
specific requirements you need for 3d printing? Otherwise it will be
difficult to help you out.
- maximum print dimension in width X length (e.g., 200x200mm)

200x200 is enough to print the 260mm-long edge parts *across the
diagonal*. you get about a 4mm gap all the way round so it *really
does* need a printer that is *genuinely* 200x200.

Post by Vincent
- minimum wall thickness (e.g., 1mm)

yeah it's about 1mm, maybe 1.2mm. a couple of places are 0.7mm
which cura 15.04 _will_ still do... but only with a 0.4mm nozzle. a
0.5 will be "optimised out".

Post by Vincent
- smallest detail (e.g., 0.3mm)

0.3mm sounds about right

Post by Vincent
Also, having a single component of the casework as a sample print could
be helpful (meaning: if this prints OK, we would expect that all the
other components are of equal quality).

http://hands.com/~lkcl/eoma/kde_tablet/3dcase/ then go to the stl
directory. i recoomend trying base_back.stl, base_end.stl and
back_base_hinge.stl with orientation *AS-IS*. do NOT alter their
orientation.

then try fitting all 3 together. do NOT add "internal support" to
any except back_base_hinge.stl. raft is not necessary. brim *might*
be necessary (try it).

Post by Vincent
I value your quality-first approach and do not want to settle for less.

:)

Post by Vincent
We have a couple of decent 3dprinting suppliers in Germany which I did
use in the past (though, for tiny objects only). I could offer to get
quotes from them and/or do some negotiating. Also, check their quality
based on the sample component to print (which I could also send to you).

appreciated

Post by Vincent
Another approach could be to distribute the load: There are many
hacker/maker spaces around the world. Many of them do have 3d printers
and offer printing at much cheaper rates. I do have good friends at a
maker space with an Ultimaker 2+ and most of the time the printer is
idle. Since they are a registered voluntary association, they are always
interested in receiving minor donations in return for services.
I could ask them to print a couple of cases?

see what they say.

Post by Vincent
How about buying 10 Ultimaker+ and selling them via crowdsupply as part
of the EOMA68 campaign (with a reasonable deduction, due to the reason
being used)?

yeahhhh that's $USD 12,000 just on 3D printers. and on 3D printers
that can only do around 150mm/sec. see message to neil: we really do
need to be smarter about the selection criteria.

particularly given that the budget's not going to be enough. i also
have to get smart about this, hence why i'm looking to do a second
campaign, and this time increase the prices (and volumes) so as to
bring in more cash in order to complete all the pledges, *but* make
designs that use the same PCBs *as the first campaign*, thus reducing
overall the manufacturing cost for *both* campaigns.

Post by Vincent
You did address PLA a couple of times. How about the resin option? Any
specifics? How many people ordered it?

not many. i honestly haven't investigated resin fully, yet. i do
know it'll come out great, but it's lower on the priority list.

l.

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[Hrvoje Lasic]

we tried resin for our prototypes. visually it looks quite nice but parts
are easy to break, so would not consider it. many parts will not survive
shipping alone.

Post by Luke Kenneth Casson Leighton

Post by Vincent
You did address PLA a couple of times. How about the resin option? Any
specifics? How many people ordered it?

not many. i honestly haven't investigated resin fully, yet. i do
know it'll come out great, but it's lower on the priority list.
l.

[Lauri Kasanen]

On Fri, 19 May 2017 07:52:54 +0200

Post by Hrvoje Lasic
we tried resin for our prototypes. visually it looks quite nice but parts
are easy to break, so would not consider it. many parts will not survive
shipping alone.

How did you process them? They need some UV/sunlight to harden.

- Lauri

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