LCD for handset and 3D printing help needed

[Serg l]

I ran two samples, one with 0.4 nozzle, on the right and another  0.2
nozzle, on the left. I measured it with my pretty crappy caliper, and it is
within 0.2mm error, but maybe a bit more. Usually for parts made on the
same machine it is okay. This can be compensated by applying a small
scaling in the slicer since the model has correct dimensions in STL file.
https://photos.app.goo.gl/nOydpeTGDVduYRnR2

Overall it looks okay, corners hold reasonable tension without breaking.

-Serg

On Sat, Jun 2, 2018 at 1:12 PM, Serg l <serg at tvman.us> wrote:

> So far it stays within the footprint of LCD. Here is a simple rendering
> with dimensions https://drive.google.com/file/d/
> 18C59D6wkfz6w5kxejMQC2ls93uSuLQG_/view?usp=sharing
>
> On Sat, Jun 2, 2018 at 2:13 AM, Mychaela Falconia <
> mychaela.falconia at gmail.com> wrote:
>
>> Hi Serg,
>>
>> > A couple of notes. Would it be possible to extend the spacer by 1 mm
>> > outside of the LCD footprint?
>>
>> Do you mean extend by 1 mm total (extra 0.5 mm on each side), or have
>> an extra 1 mm on each side?  I would hope that adding just 0.5 mm on
>> each side should be sufficient - this way there is a full 1 mm of
>> outer wall at the points where the alignment pins go in.  Or do we
>> need even more outer wall at those points?
>>
>> > On the inside at the bottom legs it will be
>> > just 0.4 mm wall for the pin, with +/-0.1 mm precision it is too close.
>> I
>> > was thinking that making a notch instead of a hole would be a better
>> > option. This way I can have reasonable margins on outer side.
>>
>> Yes, with my original idea the inner wall at the bottom pin hole would
>> only be 0.2 mm or so (if we leave another 0.2 mm of margin), so that
>> inner wall would essentially disappear at the widest point of the hole.
>> You are saying to just replace the hole with a notch, right?  Probably
>> a good idea.
>>
>> > I have done a quick draft, does it look like a good candidate?
>> > https://drive.google.com/file/d/1Xd6pzuXVFUHUF1dC9Sl3Gq-ViYB
>> u-rKJ/view?usp=sharing
>>
>> Unfortunately I am a cave-dwelling neanderthal and have no idea what
>> to do with an STL file. :(
>>
>> > How much space do we have under the LCD
>>
>> I don't understand the question.  Without the proposed spacer under
>> consideration, there is essentially zero space under the LCD module if
>> it is pressed against the PCB - the module is misdesigned in my
>> opinion.  As to how much space under the LCD we need to *create* by
>> way of our spacer, my target is 1.5 mm, so we can accommodate a Molex
>> 51296-4594 connector for the FPC tail (1.30 mm height above the PCB,
>> the thinnest I could find that is compatible with this LCD module's
>> tail configuration) with a little bit of margin.
>>
>> > and can we have the spacer sticking
>> > outside of the screen footprint?
>>
>> Yes, we can make the spacer footprint extend a little wider than the
>> 38.40 mm width of the LCD module, but we should only extend it as much
>> as absolutely necessary.
>>
>> > I made it 2 mm wide
>>
>> Does it mean that the inner edge of each wall coincides with the
>> innermost point of the alignment pin on that side while the outer edge
>> of each wall extends 0.5 mm past the outer edge of the module shell?
>>
>> > and 1.5 at the bottom
>> > to accommodate the flat cable.
>>
>> We need the space not so much for the flat cable (FPC tail), but for
>> the PCB-mounted connector into which this FPC tail will need to go.
>>
>> At this point the most effective way for you to help this project
>> would be to receive a physical LCD module from me and start
>> experimenting with it hands-on.  Where should I send it?
>>
>> M~
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>
>