OpenAstroExplorer source product photograph; exact revision unconfirmed · OpenAstroTechSource ↗

Watch: Historical development update; not a v1.0 assembly guide

OpenAstroTech · Original project source ↗

CAIBI ASSESSMENT

OpenAstroExplorer v1.0

CAIBI VERDICTBUILD FOR THE EXPERIENCE

A compact open-source equatorial mount for light-to-midrange astrophotography, combining printed mechanics, belt and worm drives, stepper control and built-in automatic polar-alignment hardware.

See what the build involves Original source ↗

Build or buy?

Compare the documented build with the purchase reference.

Build it yourself

Known parts cost£343Build total not establishedDIY kit only; tripod, counterweights and power extra

Time: Multi-stage build, alignment and commissioning rather than a single assembly session.
Difficulty: 5/5
Physical processes: 3D printer or printed-parts route · Hex keys · Drill and tap for raw-extrusion route · Soldering/crimping for full self-source route

See build requirements →

Purchase reference

Buy price referencePrice not checkedNo priced alternative recorded

Check the source for the exact model, availability and what is included.

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Purchase comparison not yet priced

What the prices cover

The current complete OAE DIY kit is €399. The GBP and USD displays use CAIBI’s dated 4 Sep 2026 FX research snapshot for planning. The source repository separately publishes a $200-350 self-source estimate; CAIBI keeps that as a different route rather than blending it with the prepared seller kit.

Includes: Current €399 complete DIY kit; 65 seller-prepared printed parts with heat-set inserts; About 300 hardware parts and screws.

Not included: Tripod and counterweights; 12 V power supply rated at least 2 A; Camera, lens or telescope; Optional guider and imaging accessories; Shipping, VAT/import effects where applicable; Self-sourcing tools and labour.

Build evidence recorded 5 Sep 2026. Currency conversions are approximate.

The seller’s €499 pre-built OAE listing is out of stock and the seller is unsure whether it will be offered. Mainstream equatorial mounts and star trackers also vary materially in payload, guiding, tripod/power inclusion, support and openness. CAIBI therefore records the OAE build route without manufacturing a commercial saving.

GLOBAL purchase/source reference ↗GLOBAL purchase/source reference ↗

BUILD AT A GLANCE

Source view and main parts

Check the source ↗

OpenAstroExplorer source product photograph; exact revision unconfirmed · OpenAstroTech ↗

PHYSICAL BUILD11 key parts or groups

No.	Source specification
01	Printed OAE mechanical parts and heat-set inserts or the equivalent seller-prepared printed set
02	2020/4040 aluminium extrusions and Arca-compatible clamps/plates
03	6012
04	GT2 pulleys and belts
05	Custom OAE board
06	RA 0.9-degree NEMA 17
07	Fasteners
08	Sturdy EQ5-compatible or Arca-compatible tripod supplied separately
09	Counterweights supplied separately
10	12 V power supply rated at least 2 A supplied separately
11	Camera or telescope

Full source specifications

Printed OAE mechanical parts and heat-set inserts or the equivalent seller-prepared printed set
2020/4040 aluminium extrusions and Arca-compatible clamps/plates
6012, 625, F695, 6907, F6006, 51111 and LM5UU bearing set
GT2 pulleys and belts, 50T worm gear set and MGN9C linear rail
Custom OAE board, ESP32, two TMC2209 drivers and two A4988 drivers
RA 0.9-degree NEMA 17, dual-shaft DEC NEMA 17 and two small Alt/Az steppers
Fasteners, small parts and wiring
Sturdy EQ5-compatible or Arca-compatible tripod supplied separately
Counterweights supplied separately, roughly matched to the mounted gear weight
12 V power supply rated at least 2 A supplied separately
Camera or telescope, imaging accessories and optional guider supplied separately

TOOLS / PROCESSES4 involved

3D printer or printed-parts route
Hex keys
Drill and tap for raw-extrusion route
Soldering/crimping for full self-source route

The real-world work

YOU STILL HAVE TOThe real-world work

Choose a latitude, tripod and payload route that suits the actual observing setup
Print or buy the mechanical parts and inspect critical fits
Drill and tap raw extrusions where the selected sourcing route requires it
Install bearings, belts, pulleys, worm drive, linear rail and fasteners without introducing binding or play
Wire the controller, drivers and motors correctly with power disconnected
Provide a stable 12 V supply and safe outdoor power arrangement
Mount and balance the camera or telescope with suitable counterweights
Physically align, polar-align, calibrate and guide the real mount
Verify tracking, cable clearance and stability before leaving a session unattended

THE BUILD SEQUENCE

How it comes together

1Preparation

Choose the exact sourcing route first
The current €399 DIY kit includes prepared printed parts plus the main hardware. The €290 hardware-only route and individual sub-kits have different availability, while fully self-sourcing adds printing, insert installation, drilling, tapping and crimping work. Do not mix headline prices across those routes.
AI + YOU
Prepare printed parts and extrusions
Print or buy the correct v1.0 parts, install inserts where required and prepare the specified 2020/4040 extrusions. The store extrusion kit is already drilled and tapped; raw self-sourced extrusion is not.
YOU
Build the base and polar-alignment structure
Assemble the large bearing-supported base and foldable Alt/Az mechanism, following the source torque and fit guidance. Binding, loose bearings or misaligned extrusion will carry directly into pointing and tracking behaviour.
YOU

2Build and assembly

Assemble RA and DEC motion
Build the two-stage belt reduction on RA and the worm-driven DEC axis, setting belt tension, worm preload and bearing fits mechanically. AI can explain the mechanism, but it cannot feel backlash, preload or a sticky axis.
YOU
Install electronics with power off
Fit the OAE board, ESP32, motor drivers and steppers using the exact current wiring route. OpenAstroTech warns that the steppers can damage hardware if miswired and says never to connect or disconnect steppers or drivers while the mount is powered.
YOU
Mount on a rigid tripod and balance the payload
Use the BOM-recommended sturdy EQ5 or Arca-compatible tripod route, not a lightweight photo tripod. Add counterweights at roughly the mounted gear weight and confirm that clamps, cables and the full imaging payload remain secure through the operating range.
YOU

3Configure and test

Configure firmware and prove basic motion
Use the supported OpenAstroTech firmware/documentation route for the actual OAE electronics, then verify direction, limits, homing or reference behaviour and AutoPA motion before attaching expensive imaging equipment.
AI + YOU
Polar-align, guide and measure the real result
Commission the mount outdoors, check balance and polar alignment, then use the actual imaging scale and guiding logs to tune the system. Treat the source-published 0.6-0.9 arcsecond RMS figure as a target/specification rather than something the build automatically achieves.
AI + YOU

Benchmark this project

Use the OpenAstroExplorer v1.0 prompt. Compare what different models deliver, then add what happened when you tried it.

Try this benchmark

View the project prompt

CAIBI adaptation · Prompt 1.0 · Project source

Prompt for OpenAstroExplorer v1.0

CAIBI project benchmark: OpenAstroExplorer v1.0
Prompt version 1.0

Help me build OpenAstroExplorer v1.0 using the existing creator project at https://github.com/OpenAstroTech/OpenAstroExplorer. This is a CAIBI benchmark adaptation of the project build brief, not a claim about how the creator used AI.

Project context:
- A compact open-source equatorial mount for light-to-midrange astrophotography, combining printed mechanics, belt and worm drives, stepper control and built-in automatic polar-alignment hardware.
- Build context: Printed OAE mechanical parts and heat-set inserts or the equivalent seller-prepared printed set; 2020/4040 aluminium extrusions and Arca-compatible clamps/plates; 6012, 625, F695, 6907, F6006, 51111 and LM5UU bearing set; GT2 pulleys and belts, 50T worm gear set and MGN9C linear rail; Custom OAE board, ESP32, two TMC2209 drivers and two A4988 drivers; RA 0.9-degree NEMA 17, dual-shaft DEC NEMA 17 and two small Alt/Az steppers; Fasteners, small parts and wiring; Sturdy EQ5-compatible or Arca-compatible tripod supplied separately; Counterweights supplied separately, roughly matched to the mounted gear weight; 12 V power supply rated at least 2 A supplied separately; Camera or telescope, imaging accessories and optional guider supplied separately.
- Where AI helps: Navigate the BOM, CAD, printed-parts list and assembly documentation, Separate the complete-kit, hardware-kit and fully self-sourced routes, Help check part specifications before ordering or printing, Explain firmware configuration and mount-control concepts, Help investigate ASCOM, INDI, PHD2 and guiding logs, Calculate planning values for balance, gearing and imaging scale, Help document modifications after the baseline mount works.
- Physical work: Choose a latitude, tripod and payload route that suits the actual observing setup, Print or buy the mechanical parts and inspect critical fits, Drill and tap raw extrusions where the selected sourcing route requires it, Install bearings, belts, pulleys, worm drive, linear rail and fasteners without introducing binding or play, Wire the controller, drivers and motors correctly with power disconnected, Provide a stable 12 V supply and safe outdoor power arrangement, Mount and balance the camera or telescope with suitable counterweights, Physically align, polar-align, calibrate and guide the real mount, Verify tracking, cable clearance and stability before leaving a session unattended.
- Main limitation: The €399 kit is not a complete astrophotography setup. You still need a rigid tripod, roughly matched counterweights, a suitable 12 V supply and the imaging equipment itself. Tracking quality depends on mechanical fit, balance, polar alignment, firmware configuration and real guiding performance. The published 0.6-0.9 arcsecond RMS figure is a source specification, not an independent CAIBI measurement.

Read the source first. Use its published design, files, dimensions and parts as the baseline; do not redesign it unless a missing detail requires a clearly labelled proposal. If you cannot access a source or verify a revision, say so.

Provide one practical build package:
1. Design and files: explain the source design, link the original editable files, and identify missing files or modifications.
2. Parts and fabrication: give quantities, exact variants and compatibility, plus a cutting or printing list where applicable. Preserve source dimensions; flag anything unconfirmed.
3. UK and US purchasing: direct product links, checked dates, stock, pack sizes, taxes, delivery and regional costs. Mark unverifiable details as unknown; do not invent links, prices or availability.
4. Assembly: an ordered guide covering fabrication, fitting, wiring or software as applicable, setup, checks and troubleshooting.
5. Cost and time: separate parts, fabrication, delivery, hands-on time and machine time, with assumptions and exclusions.
6. Function and ease: a test plan for the project's stated purpose, likely difficulties, required skills and any corrections or limitations.

Keep source facts, your proposals and items needing physical verification distinct. An estimate is not a measured build result. Do not claim to have built or tested hardware. Include failed attempts and omissions. If a section does not apply, say why.

Use the source as accessed during this run and record its revision or access date. The prompt is fixed; the linked source can change.

Open and copy prompt →

Benchmark results 0

No reviewed results yet for OpenAstroExplorer v1.0. Add the first result →

AI IN THIS PROJECT

Get AI help on this build

CAIBI · AI CAN HELP

AI can help with

Navigate the BOM, CAD, printed-parts list and assembly documentation
Separate the complete-kit, hardware-kit and fully self-sourced routes
Help check part specifications before ordering or printing
Explain firmware configuration and mount-control concepts
Help investigate ASCOM, INDI, PHD2 and guiding logs
Calculate planning values for balance, gearing and imaging scale
Help document modifications after the baseline mount works

CAIBI · AI CAN'T DO

You still need to

Choose a latitude, tripod and payload route that suits the actual observing setup
Print or buy the mechanical parts and inspect critical fits
Drill and tap raw extrusions where the selected sourcing route requires it
Install bearings, belts, pulleys, worm drive, linear rail and fasteners without introducing binding or play
Wire the controller, drivers and motors correctly with power disconnected
Provide a stable 12 V supply and safe outdoor power arrangement
Mount and balance the camera or telescope with suitable counterweights
Physically align, polar-align, calibrate and guide the real mount
Verify tracking, cable clearance and stability before leaving a session unattended

Original source AI use and prompts

SOURCEThe original project does not publish an AI prompt

The prompts below are CAIBI helpers for this build. They are not presented as instructions from the creator.

CAIBI STARTING PROMPTS

Copy a prompt for this build

Each prompt tells AI to keep the original project source as the reference and to flag anything you must verify on the real build.

Ways to take it further

AFTER THE FIRST BUILD

Ways to take it further

Current €399 complete DIY kitHardware/sub-kit plus self-printed parts routeFully self-sourced v1.0 buildEQ5-style tripod installationArca-compatible tripod installationOptional OpenAstroGuider integration

More routes and resources

OTHER WAYS TO GET THERE

You do not have to follow one route.

ORIGINAL BUILDFollow the creator route

Use the published files and instructions as the baseline.

OUTSOURCE A PROCESSGet specialist fabrication done

You do not necessarily need to own every capability used here: 3D printer or printed-parts route, Hex keys, Drill and tap for raw-extrusion route, Soldering/crimping for full self-source route.

ALTERNATIVE PROJECTImageGenCam

A buildable Raspberry Pi camera designed around a Codex-assisted hardware and software workflow.

REVIEWED RESOURCES

Useful places beyond the main source

GITHUB REPOOpenAstroExplorer hardware source

Current v1.0 mechanical source, CAD, printed parts and published source specifications for the OpenAstroExplorer mount.

DOCSOpenAstroExplorer bill of materials

Current BOM for the exact OAE route, including motion, bearings, electronics, required tripod, counterweights, 12 V power and self-build tooling.

DOCSOpenAstroExplorer assembly guide

Official assembly and setup documentation for the current OpenAstroExplorer generation.

DOCSOpenAstroTech electronics guidance

Current mount electronics guidance, including explicit stepper wiring and powered-connection safety warnings.

DOCSOpenAstroExplorer DIY kit

Current seller route for the €399 DIY kit, which includes 65 printed parts and about 300 hardware parts and screws but still requires a tripod, counterweights and power supply.

DOCSOpenAstroExplorer product collection

Current availability across OAE kits and sub-kits. Also records the €499 pre-built listing as out of stock with the seller explicitly unsure whether it will be offered.

SOURCE · CAIBI · BUILDERS

What supports the verdict

SOURCEOpenAstroTech

OpenAstroExplorer v1.0 is the current stronger OpenAstroTech assessment target. The repository was pushed in Jan 2026 and explicitly identifies v1.0 as released. The current seller lists the complete DIY kit at €399 and low stock; the source repository separately gives a $200-350 build-cost range. The older OpenAstroTracker remains an active software/community reference, but its €259 full DIY kit and €185 hardware-only route are currently sold out, so CAIBI no longer treats it as the stronger current assessment candidate.

Open source ↗

CAIBIBUILD FOR THE EXPERIENCE

OpenAstroExplorer is a serious open mount rather than a novelty star tracker. The current v1.0 source publishes CAD, printable parts, BOM and assembly guidance, while the seller offers both a complete DIY kit and component routes. It makes sense when learning, modification and ownership of the motion platform matter. If the goal is simply a supported mount that works with minimum setup, a mainstream commercial equatorial mount remains the lower-risk route.

Evidence: Strong

BUILDERSNo published reports yet

Actual time, cost, changes and outcomes appear here after submitted builds are reviewed.

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HAVE YOU MADE THIS?

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First-hand evidence improves the assessment

What we want to know

What happened when you actually tried to make it.

Did it work?
Actual time and cost
What did you change?
What was harder than the source suggested?
Would you build it again?