Summary

This is a 3-part case with access to the Raspberry Pi for the LMN-3

LMN-3 demo: https://www.youtube.com/watch?v=h5UmPTttN1s
LMN-3 build guide: https://github.com/FundamentalFrequency

How I Designed This

I've imported stl files from the original project into blender and adapt it to rpi 2B, then change a lot of things.

The latest version of the blend file is provided in this bundle.

I've used the extensions 3D print Toolbox and MeasureIt to fix the shape.

screen capture of blender with left part and rpi frame modeled. Several measurements are displayed and the rpi blueprint in the front.

Details

This case has it's own switch layer but is also compatible with original one from https://github.com/FundamentalFrequency.
The case parts includes a ledge, so the PCB doesn't blend when keys or rotary encoders are pressed.

You can find keycaps at https://www.thingiverse.com/thing:5996834

Remix Differences

This is a remix from initial case by fofinho666.

Those are the main differences:

The case is higher and leave space for additional content like battery (30mm versus initial 16mm)
Frames for both raspberry pi2B and 3 are available *
The screen cover has been made for a velleman wpi400 screen and might need some adjustments for your screen
All usb ports are accessible and no soldering have been made: you'll need to drill a hole for the usb cable.

(* Note: I've only printed raspberry pi 2B frame)

Material needed for this case

Case:

8 M3x30mm screw
8 M3 nut

Raspberry:

4 m2.5 screw
4 m2.5 nuts

Also, some brass spacers will probably useful to put between the screen and the raspberry.
I used 2 x m2.5x6 female and 2 x m2.5x10 male.

Changelog & additional info

0.6.0: add rpi 3 frame
0.5.1: increase the tolerance between parts (0.5mm)
0.5.0: keycaps
0.4.0: screen cover + rework case parts
0.3.0: split switch layer
0.2.0: assemble cases parts
0.1.1: remove standoff
0.1.0: init:
rpi 2b+ frame
case parts unchanged
standoff not finished
medium layer not finished

rpi frames

Currently the raspberry frames are a bit too thin and feels fragile, fortunately when all pieces are fixed it's very sturdy.
It would be nice to widen the sides but it requires to change all the things: switch layer, case parts …

Acknowledgments

fofinho666 for the initial case
Kevin for the printing and advisoring
and obviously stonepreston for the LMN-3

LMN-3 case