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Empowering Surveyors and Engineers Worldwide with Accessible Centimeter-Level Positioning
オープンソース 2Wayモジュールー型 RTK-GNSS 筐体プロジェクト（3Dプリントデータ公開）
1. Project Mission / プロジェクトの理念
[English]
High-precision RTK-GNSS surveying equipment has traditionally been too expensive and complex for many field engineers, researchers, and local communities around the world—especially in developing regions.
At JPS LLC (Japan), our corporate mission is "Making Positioning Simpler."
We designed this rugged, ultralight, and modular enclosure system so that anyone in the world with access to a consumer 3D printer, a standard SparkFun ZED-F9P board, and basic hardware-store nuts can build a professional-grade RTK-GNSS rover at a fraction of the traditional cost.
[日本語]
高精度なRTK-GNSS測量機は従来は非常に高価で、発展途上地域をはじめとする世界中の現場技術者や研究者等にとって、その導入には高いハードルがありました。
弊社は「位置計測をよりカンタンに」という理念のもと、一般的な3Dプリンターと市販の汎用基板（SparkFun ZED-F9P）、そして世界中のどこの金物店でも手に入る一般的な「金属ネジと六角ナット」だけで組み立てられる実用的なRTK-GNSS筐体を開発し、その3D設計データを世界に公開しました。
2. Key Design Highlights / 設計の4大特徴
2. Key Design Highlights / 設計の4大特徴
- 100% Standard Metal Hex Nuts (No Heat-Set Inserts Required)
Does not require special brass heat-set inserts or soldering irons. All mounting threads (5/8"-11, 1/4"-20, M6, and M3) use standard hexagonal nuts embedded inside precision pockets for maximum durability anywhere in the world.
（特殊な熱圧入インサートナットやハンダごては不要。すべてのネジ部に市販の金属六角ナットを内蔵する高耐久設計です）
- Tool-less 2-Way Snap-Fit Arca-Swiss Mount
Features a 3D-printed cantilever spring latch on the Φ130mm antenna base. Attach the ZED-F9P case to the survey pole or release it with one thumb for handheld smartphone photogrammetry.
（一体成型の板バネラッチにより、5/8インチ測量用ポールへの装着とスマホハンディ計測を1秒で着脱可能）
- 4-Direction Rotatable Foot (38 × 38 mm)
The symmetrical Arca-Swiss foot allows the receiver case to be locked in any 90-degree orientation for stress-free USB-C and SMA cable routing.
（前後左右4方向から差し込み可能で、ケーブルの向きを自在に選べます）
- Sealed Internal Ground Plane (Φ124mm)
A 0.4mm recessed pocket inside the top cover seals an aluminum sheet (or heavy-duty aluminum/copper foil) to block multipath interference and prevent corrosion.
（天板内部のポケットに直径124mmの薄アルミ板や金属箔を密閉し、マルチパスを防ぎます）
3. Bill of Materials (BOM) / 必要な部品リスト
3. Bill of Materials (BOM) / 必要な部品リスト
3-1. 3D Printed Parts (STL Files) / 3Dプリント部品リスト
01_F9P_Case_Bottom.stl (Lower case with 4-way Arca-Swiss foot)
02_F9P_Case_Top.stl (Upper cover with interlocking lip & JPS logo)
03_Antenna_Base_130mm.stl (Main Φ130mm base with snap-fit rail & 3 bosses)
04_Antenna_Top_Cover_130mm.stl (Top plate with Φ124.5mm ground plane pocket)
05_Hex_Pressing_Ring.stl (Spacer ring for 5/8"-11 nut & GND connection)
06_Optional_Receiver_Plate.stl (Standalone Arca-Swiss receiver mount with captive 1/4"-20 slot)
3-2. Electronics & Off-the-Shelf Hardware / 市販の汎用基板・金具リスト
GNSS Board: SparkFun GPS-RTK2 Board - ZED-F9P (Qwiic) × 1
GNSS Antenna: Multi-band RTK-GNSS Antenna (SMA connector) + SMA Cable × 1
Ground Plane: Φ124mm Aluminum sheet (thickness: up to 0.4mm) or Heavy-duty Aluminum/Copper Tape × 1
Survey Pole Nut: 5/8"-11 Hex Nut (Standard survey thread) × 1
Camera Mount Nut: 1/4"-20 Hex Nut (Standard tripod thread) × 1
Fasteners: M6 Screws & Hex Nuts (×3 sets for antenna base bosses), M3 Screws & Hex Nuts (for case assembly)
4. Recommended 3D Print Settings / 推奨プリント設定
4. Recommended 3D Print Settings / 推奨プリント設定
Filament Material（推奨素材）:
ASA or PETG (White or Light Gray is strongly recommended to minimize solar heat absorption under direct sunlight.
直射日光下での温度上昇を防ぐため「白」または「ライトグレー」「透明」を推奨)Layer Height（積層ピッチ）:
0.20 mm (Nozzle: 0.4 mm, Wall Generator: Arachne)Wall Loops（壁の周回数）:
4 loops (Essential for strong M6/5/8" bosses and consistent snap-fit spring tension / ボスと板バネの強度確保のため壁4周を推奨)Infill（インフィル充填率）: 25% (Gyroid or Grid)
Print Orientation & Supports（配置の向きとサポート設定）:
Case Top (02):
Flip 180° upside down (place top logo face on the build plate). No supports needed.
Case Bottom (01):
Place foot flat on the build plate (Z=0). Enable Normal Support (Snug) for the step overhang (or print foot and body separately).
Antenna Base (03):
Place the flat front surface (Z=0) on the build plate. Enable Normal Support (Snug) only underneath the cantilever spring pocket (2.2mm gap) and finger lever. Remove the support material after printing to free the spring.
5. License & Fair Pricing Spirit
/ ライセンスと商用利用について
5. License & Fair Pricing Spirit
/ ライセンスと商用利用について
License: Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
You are free to Share (copy and redistribute the material in any medium or format) and Adapt (remix, transform, and build upon the material) for any purpose, even commercially, under the following terms:
Attribution (BY / 表示):
You must give appropriate credit to JPS LLC (https://www.qzss4survey.com/), provide a link to the license, and indicate if changes were made.
ShareAlike (SA / 継承):
If you remix, transform, or build upon the material, you must distribute your contributions under the same license (CC BY-SA 4.0) as the original. You may not lock improvements behind proprietary licenses.
A Note from JPS LLC on Commercial Use
(Fair Pricing Spirit / 良心的な価格での普及のお願い):
We intentionally chose NOT to restrict commercial use (no "NC" clause) because we want local engineers, FabLabs, universities, and small workshops in developing regions to be able to 3D-print, assemble, and provide this equipment to local surveyors at a fair, accessible price.
If you manufacture and sell printed parts or assembled kits based on this design, we kindly ask that you keep your pricing reasonable and fair to support the global surveying community.
（私たちは、発展途上地域の技術者や研究者、小さな工房がこの機材を3Dプリント・組み立てし、現地の測量技術が必要な人の手へ届きやすい価格で提供できるようにするため、あえて「非営利（NC）」の制限を設けていません。もし本設計をベースにプリント品やキットを販売される場合は、世界の測量コミュニティを支援するため、良心的でフェアな価格設定にしていただけますようお願いいたします。）
6. Download Files & Contact / ダウンロード・お問合せ
6. Download Files & Contact / ダウンロード・お問合せ
Need Assembled Units, Apps, or Surveying Support in Japan?
Contact: JPS LLC (合同会社ＪＰＳ)
e-mail: jps@qzss4survey.com
web-site: https://www.qzss4survey.com
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