ESP32-NTP (GPS-Disciplined NTP server) Enclosure
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GPS-Disciplined Stratum 1 NTP Server Enclosure (ESP32 + W5500 + MAX-M10S)
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- Creative Commons — Public Domain
GPS-Disciplined Stratum 1 NTP Server Enclosure
A two-piece, magnet-held 3D-printed enclosure for a DIY GPS-disciplined Stratum 1 NTP server built on an ESP32. No screws hold the lid shut. It snaps closed on embedded disc magnets, but the internal modules are secured with screws/clips as noted below.
Fits
D1 Mini ESP32
WIZnet W5500 Ethernet breakout
SparkFun MAX-M10S GPS module
Mounting Hardware
GPS module (MAX-M10S): secured with 4x M3x6 button head screws
W5500 Ethernet breakout: secured with 2x M3x6 button head screws plus a rear retention clip
ESP32 (D1 Mini): friction-held, no screws
Lid: magnet-held, no screws
Credit / Attribution
This enclosure is designed for dniminenn/esp32-ntp, the original open-source firmware project by dniminenn that turns this hardware into a sub-microsecond GPS Stratum 1 NTP time server. All firmware credit belongs to dniminenn. This listing is for the physical enclosure only.
This case ships as part of Bestivus/esp32-ntp, a fork of the above that includes some bugfixes and additional MQTT functionality added.
Credit to eroedig and their model for an ESPresense enclosure which uses the same ESP32 D1 Mini. Their mounting method was adapted and modified and used in this model.
Print Notes
Magnets are embedded during printing, not press-fit afterward. Pause your slicer at the layer height where each magnet cutout closes, drop the magnet in, then resume.
Magnet size: 6x2mm disc magnets, requires four per half
Magnet cutouts:
Bottom case, 6.2mm diameter, 2.4mm depth, 0.6mm material remaining over the cutout
Top lid, 6.2mm diameter, 2.4mm depth, 0.5mm material remaining over the cutout
Tested on a Bambu Lab X2D. Verify your own pause height and magnet fit tolerance before a full print, and consider a non-magnetic nozzle.
Hardware Needed
8x+ 6x2mm disc magnets
6x M3x6 button head screws
License
Public domain (Unlicense). Remix, reprint, and redistribute freely. Firmware attribution to dniminenn (above) is appreciated on any redistribution but not legally required.