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Boeing 737 Start Switch - Servo Operated

This page is split into three main sections:

Parts Guide

Print Guide

Build Guide

The ultimate printer I can recommend is the Bambu Labs X1 carbon with AMS or P1P if you have deep pockets. ($1200). It's a massive leap forward in 3D printing, with excellent quality and impressive speeds. It's pretty much press print and go as the software and hardware do the calibration before each print. 

pilot sign get here.png

This design is a remake of my old design, but this time inspired by Mickey's flightdeck Youtube video:

The use of an MG90S micro servo instead of an inductive load such as a solenoid was genius and in my opinion a massive step forward and now the only way ahead! We can forget about the weak acting and high current solenoids, remove the reverse bias diodes and relays. This design is:

Uses less current
Does not require a separate different voltage supply

My new design consists of 6 simple 3d printed parts, including the knob. These are quick to print and assemble. You will require some extra hardware, please see below in the component parts section.

The unit can now be affixed to the panel by the same nut used for the rotary switch, it's the imperial version that comes with most switches. Or you can attach the unit by the 4 attachment holes in the upper case assembly.

This design requires a print size of 220mm x 220mm.

General Information:

Pilot Spanner.jpg

Build Guide

Build Guide
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