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

On Fri, May 19, 2017 at 12:42 AM, Vincent ml.eoma68@eml.cc wrote:

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)

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.

• 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".

• smallest detail (e.g., 0.3mm)

0.3mm sounds about right

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).

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).

appreciated

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.

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)?

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.

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.