88 lines
3.5 KiB
Markdown
88 lines
3.5 KiB
Markdown
 
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# Desk case
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A 3D-printable desk case for the Samsung 20L203 VFD and a WEMOS D1 R1
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(UNO-sized ESP8266 board). The display is tilted back 15° and bolted to the
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front with M3 screws. The DC jack and the USB port are reachable through the
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back wall.
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<p>
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<img src="preview.png" alt="Case preview" width="49%">
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<img src="section.png" alt="Cross-section: display on the bezel, board on the base" width="49%">
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</p>
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Outer size: about 208 × 112 × 86 mm (W × D × H). The parts need a print bed of
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at least 210 × 115 mm.
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## Parts
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| File | Print orientation | Notes |
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|------|-------------------|-------|
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| [stl/body.stl](stl/body.stl) | upside down, top on the bed (as exported) | Sides, top and back wall. No supports needed. |
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| [stl/bezel.stl](stl/bezel.stl) | face down (as exported) | Front panel with the window and the display bosses. |
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| [stl/base.stl](stl/base.stl) | flat (as exported) | Floor with the board standoffs and the screw holes. |
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PETG is a good choice: the display warms the inside by a few degrees. PLA
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works if the case stays out of the sun.
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## Hardware
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- 10 × M3 heat-set inserts (about 4.6 mm OD, 5.7 mm long; the holes are 4.0 mm
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and 6 mm deep):
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- 4 in the bezel's display bosses
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- 2 in the bezel's feet
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- 2 in the body's rear corners
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- 4 on the base's board standoffs
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- 4 × M3×8 to bolt the display to the bezel
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- 4 × M3×6 to hold the D1 board on its standoffs
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- 4 × M3×8 to hold the base on, from below
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## Assembly
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1. Melt the inserts in.
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2. Bolt the display to the bezel from behind, glass facing the window.
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3. Screw the D1 board onto the base, with the DC jack and USB edge at the back.
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4. Slide the bezel, with the display on it, into the body from below. Its edges
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run in the grooves in the side walls until it stops against the top.
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5. Connect the display cable. The MAX3232 sits inline in the cable; tie it to
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the anchor on the base.
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6. Put the body on the base and screw it together from below. The base holds
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the bezel in place.
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## Measure before printing
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The dimensions come from the 20L203**DA12** datasheet. Your board is a DA5, so
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check these against yours and change the values at the top of
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[vfd-case.scad](vfd-case.scad) if needed:
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- `disp_hole_inset`, `disp_w`, `disp_h`: the display's mounting holes, 182 ×
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56 mm apart.
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- `glass_x0`, `glass_y0`, `glass_w`, `glass_h`, `glass_depth`: the glass
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position and the distance from its front face to the PCB.
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- `usb_pos`: where the micro-USB port is along the D1's back edge (38 mm from
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the jack side is a guess based on the UNO layout). Also check `jack_pos`.
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If only the display is off, it's enough to reprint the bezel.
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## Changing the design
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Open [vfd-case.scad](vfd-case.scad) in OpenSCAD. Every dimension is a variable
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at the top, including the tilt, wall thickness and clearances. Export a part
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with:
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```
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openscad -D 'part="body"' --export-format binstl -o stl/body.stl vfd-case.scad
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openscad -D 'part="bezel"' --export-format binstl -o stl/bezel.stl vfd-case.scad
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openscad -D 'part="base"' --export-format binstl -o stl/base.stl vfd-case.scad
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```
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`part="assembly"` shows everything with dummy display and board models, and
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`part="section"` shows a cut-away. The `check_*` parts are collision checks;
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each one must render as an empty object:
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- `check_body_bezel`, `check_body_display`, `check_bezel_display`
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- `check_body_base`, `check_bezel_base`, `check_display_base`
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- `check_board`
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- `check_insertion`: sweeps the bezel and display along their slide-in path
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through the body.
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Faces that only touch can show up as a zero-volume result, which is fine.
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