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The CERN Open Hardware License is not restricted to mechanical or
electrical design files but instead has a very wide scope (see section
1.3 of the OHL).
Thus it can be applied to all contents of this repository. Having only
one license makes the license structure for this project way easier.
Since the OHL is written with hardware in mind it likely fits better to
this open hardware project.
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The y dimension of the shell connectors was assumed to be bolt_l. But
this ignores that their thickness is bolt_l-t because the bolt has to go
through the shell with thickness t before entering the shell connector.
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The positions of the connectors had to be adapted to the new PCB case
dimensions.
Furthermore the micro USB port which is built in to supply the device
with power is now the only visible micro USB port from the outside. The
other one is unused and could lead to confusion. User might plug in the
power cable into the wrong port.
Hiding this misleading USB port is an elegant way to avoid this problem.
Developers can still open the device to make use of that port if
required.
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The front panel has to be very close and thin so that USB and HDMI
cables can still be connected when only the ports are cut out of the
panel.
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Since a proper norm-based distance bolt was not found printing spacers
is the easiest way to make the case producable independent of part
availability.
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This makes sure that the bolts inside the connectors align with them.
Thus the bolts do not stick inside the case which might lead to PCB
collisions.
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The height should take into account that the shell is two instead of one
times the thickness high. This is relevant for the vertical spacing.
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The CAD model of the full assembly might be useful to be included in
other projects or CAD files.
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Most users will not own the default printer and thus cannot work with
the built gcode files with the default slicer configuration.
It might be easier for those users to manually slice the STL instead of
modifying the soundbox source code.
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This target removes the build directory and is thus repository-global.
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The front panel needs holes for the HDMI, micro USB and cinch connectors
of the Raspberry Pi Zero W.
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After switching the panel to PCB-based dimensions the shell follows with
this commit.
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The whole case should move from case- to PCB-based parameters.
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The long term goal is to switch from case-oriented parameters to
PCB-oriented parameters to simplify re-using the pcb_case library.
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This makes the file structure simpler and makes it easy to produce the
whole case in one run.
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This value used to consider only the required space for the Raspberry Pi
Zero W board, not for the required HifiBerry board.
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This will help to identify calculation issues by human visual
inspection. The PCB is not yet aligned.
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Without the bolt_ds_tol the drilling is too tight to be used for
tolerance testing without drilling manually.
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Based on tolerance test printing.
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Result from test print.
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This is the result from a tolerance test printing.
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Reducing from +/- 3 to +/- 2 reduces printing time for the tolerance
test.
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The printer resolution is set to 0.15 mm so this is a useful step size.
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This makes the results of tolerance tests available for the actual PCB
case.
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There used to be two panels but this is not required.
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The width and height tolerance test was unusable because the thickness
tolerance was not added. Thus the test part did not fit inside the slot.
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The current tolerance values should be written down inside the files
covering the related parts. The tolerance_tests.scad file should include
those values.
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nut_d should be used exclusively to avoid handling to alternatives for
the same parameter.
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This makes the file structure and module naming simpler and allows to
easily print all tolerance tests at once. This is helpful to validate a
specific printer setup.
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This allows to check the tolerances for panel width and length.
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This tests makes it easier to fine-tune the slot width which holds one
of the two panels.
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This should make sure the right hole diameter is selected for bolts.
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This bolt is a good starting point for most PCB cases.
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This special variable decides on the level of detail these cylinders are
rendered with. Since this depends also on the size and thus on the
individual cylinder it is also set per cylinder individually.
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The printer configuration should not only be added to the repository but
instead should also be used for the default Make-based builds of
mechanical parts.
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Adding a slicer configuration is important to have reproducable printing
results. While a default configuration should be sufficient to print the
part roughly it is especially important for correct tolerances that the
printer settings are exactly the same.
Starting with the i3 Mega S provides only configuration for one 3D
printer. Nevertheless additional configurations for other printers can
be added easily.
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It is quite easy to add bugs to *.scad files and miss them. Warnings can
be hidden inside the long log output.
This commit will ensure that bugs are detected earlier.
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The holes used to be all the same size. This is clearly a bug since the
test's intention is to check different sizes.
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That way it is easier to get that the test is built and not nut when
building the corresponding file.
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The old name was not descriptive and now the file contains only
parameters.
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This avoids unrequired usage of other source files and cleans up the
common.scad file.
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According to the 'Mastering OpenSCAD' [1] book it is not recommended to
set these variables globally. They should be used as local as possible
and only if needed.
This rule makes sense to allow making the model as rough as possible and
only increase the detail level if required to reduce build times.
[1]: https://mastering-openscad.eu
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