ATU-100 Case — Compact, enclosure with 3 push buttons, 0.96″ OLED, rocker switch, DC jack, and SO-239

ATU-100 Case

A compact, robust enclosure for the popular ATU-100 (7×7) tuner board. The front panel supports three momentary buttons, a 0.96″ 128×64 OLED display, a KCD11 rocker power switch, and a DC jack. The rear panel has cutouts for UHF/SO-239 connectors. Prints without supports (optional supports only around the UHF/DC holes). I designed the parts to print face-down so the heatbed texture becomes the exterior finish on the top, front, and bottom.

Description

This is my take on an ATU-100 case focused on a small footprint, easy assembly, and a clean “instrument” look.

Highlights

• Angled front panel for good visibility of the 0.96″ OLED.
• Three 6.7 mm momentary push buttons (Tune/Bypass/Mode on my build).
• Integrated power section: KCD11 rocker ON/OFF + DC power jack.
• Rear panel with two UHF/SO-239 cutouts.
• Heat-set inserts (M3H4) for PCB standoffs.
• Prints flat, face-down so the top/front surfaces take the heatbed pattern (same for the bottom panel).
• Tight internal packaging around the standard ATU-100 PCB and relays (see photos).

Note: ATU-100 boards and builds vary a little. Check your board and connectors before final assembly.

Bill of Materials (BOM) / Hardware

(in addition to the ATU-100 board/kit)

1. Momentary Push Button Switch Ø 6.7 mm — x3
2. OLED Display 128×64, 0.96″ — x1
3. SO-239 panel connector — x2
4. Rocker Switch KCD11 (cutout ~8.65×14 mm) — x1
5. DC jack Ø 7.4 mm (panel-mount) — x1
6. Heat-set inserts M3H4 — x4

Screws:

1. M3×7 (or M3×8) — x4 (top cover)
2. M3×6 — x12 (PCB standoffs, front panel, and front top)
3. M1.5 — x4 + M1.5 nuts x4 (OLED board)

Files Included

1. Main Body.stl (print face-down for reduced supports)
2. Main Top.stl (print face-down for textured exterior)
3. Front Top.stl (print face-down for textured exterior)
4. Front.stl (3 × 6.7 mm buttons, OLED window, KCD11)
5. SO-239 (UHF) Cap.stl (optional, for protecting the UHF connector during storage; requires support)

Print Settings (what I used)

Printer: Creality Ender 3 V3 (core xz), 0.4 nozzle.

Material: PETG or ABS/ASA (better heat/UV). PLA works but is less heat-resistant.

Layer height: 0.20 mm

Perimeters (walls): 5 (to provide extra strength around holes. Most walls are ~1.32 mm to yield at least three full line-width perimeters with Creality slicer presets)

Top/Bottom: 2mm solid

Infill: 40 % gyroid or cross hatch (most structural areas are solid regardless of infill).

Supports: Only around the UHF and DC jack holes if needed; most printers won’t require them.

Tolerances / Notes

Momentary Push Button Switch holes are sized for 6.7 mm OD;

KCD11 cutout is ~8.65×14 mm (panel standard); if your switch is tight, lightly dress the edges.

Caution: 

The OLED window fits common 0.96″ 128×64 I²C modules. Variants exist, so please check yours and do not force it against the front panel—you could crack the display glass.

Do not overtighten the OLED module screws; you may damage the display. The case is designed to leave minimal clearance between the display glass and the front panel, so take care during assembly.

Safety

This is an enclosure only. Ensure correct wiring, fusing, and RF grounding. Use at your own risk.