A faithful, maintenance‑friendly, and fully functional 737 chronograph/clock designed for home cockpit builders and aviation enthusiasts.
This package includes both CAD source and production‑ready STL files, engineered for straightforward printing, clean assembly, and long‑term serviceability.
 
The unit can be seen on YouTube: https://youtu.be/u70eVZwZqOs?si=0_L1wyiLcd0l0a3n
 
What it is & why it’s essential
 
We set out to create an almost perfect 737 Chrono/Clock that any builder can assemble and maintain with confidence. The result is a modular, accessible design built around a purpose‑made PCB that simplifies all the wiring most people find difficult. The clock features seven push buttons, digital time/chronograph displays, and an analogue needle, with a backlightable faceplate for authentic night lighting. Thanks to the PCB, routine servicing is easy, and parts that wear can be reached and swapped without tearing the whole unit apart.
 
Two PCB options (choose to suit your skill & budget):
Bare PCB (Through‑Hole) — the most economical option; you solder the components yourself. A simple, rewarding DIY process.
➜ https://www.737diysim.com/product-page/737-chrono-clock-decal-plate
Prebuilt SMD PCB — fully assembled with soft‑press buttons for a premium feel; you just connect the wires to the Arduino.
➜ https://www.737diysim.com/product-page/737-chrono-clock-decal-plate
Selectable digit colour: works with standard 4‑digit, 0.36" common‑cathode LED displays, so you can match your cockpit’s look.
Great on a desk or in a full cockpit: many builders use this as a standout desk display and in a fully operational 737 simulator.
For step‑by‑step parts, print, and build guidance, see the Build Guide:
➜ https://www.737diysim.com/build-guides-1/737ss-chrono
For upgrades that make the face look perfect—such as a fully detailed, fibre‑lasered resin faceplate for crisp, even backlighting—see:
➜ https://www.737diysim.com/product-page/737-chrono-clock-decal-plate
 
Key features
Authentic layout: seven push buttons, digital chronograph/time, analogue needle indication
Maintenance‑ready design: easy access to components and connectors
Modular lighting: faceplate and decal can be backlit for night‑ops realism
Flexible digit colour: supports standard 0.36" common‑cathode 4‑digit LED modules
Two PCB paths: DIY through‑hole (budget) or prebuilt SMD (premium feel)
Optimised for FDM printing: tolerance‑friendly parts tuned for consistent results
 
What’s included (download)
CAD source files (for editing and remixing)
STL files ready for slicing and printing
Note: This listing is digital files only. No physical parts or electronic components are included. The PCB, displays, fasteners, Arduino, switches, LEDs, wiring, adhesives, etc., must be sourced separately by the DIY builder.
What you’ll need (not included)
 
Electronics:
737DIYSIM PCB (choose Bare or Prebuilt SMD)
Arduino (per the build guide)
4‑digit, 0.36" common‑cathode LED displays (colour of your choice)
Seven push buttons (SMD board includes soft‑press switches)
Analogue needle mechanism (per build guide)
Backlight LEDs, resistors, wire & connectors as specified
Hardware & tools: typical M(metric)‑fasteners, brass inserts (if used), small screwdrivers, soldering iron (for Bare PCB), wire strippers/cutters
Faceplate options: standard printed plate or premium resin faceplate (fibre‑lasered) for best‑in‑class backlighting
 
Context of use
Flight simulator cockpits (737‑style builds, home cockpits, training rigs)
Desk displays for aviation fans, studios, and offices
Learning platform for electronics, soldering, and assembly (Bare PCB path)
 
Limitations / notes:
Requires the matching PCB (either Bare or prebuilt SMD) to achieve the full working feature set
This is a DIY project: basic soldering (Bare PCB), wiring, and assembly skills are required
Final fit/finish depends on your printer settings, materials, and post‑processing
Model aesthetics are inspired by the real 737 chronograph, but are independent, original CAD by 737DIYSIM for educational/home use
 
License & usage
Personal use for home simulators and displays.
Please do not redistribute, resell, or share the files.
 
3D printing settings
Build/Print/Parts Guide:
https://www.737diysim.com/build-guides-1/737ss-chrono
 
Print & assembly notes
Print with standard FDM settings (see build guide for any model‑specific recommendations)
Light‑coloured or translucent face elements pair well with backlighting; consider light‑blocking paint where needed
Designed for routine servicing: fasteners and sub‑assemblies are positioned for front access and ease of replacement.
 
Print files only? Click Here.