Davinci 1.0.28 | Mega

Newer versions (1.1.x and above) introduced auto-bed leveling issues and Wi-Fi dropouts. Version 1.0.28 is rock-solid. Print jobs that run for 30+ hours complete without thermal runaway or layer shifting.

Before the era of GPT-3.5, GPT-4, or ChatGPT, there was the GPT-3 family — and within that family, the most powerful, most expensive, and most capable engine was Davinci. While many users today remember text-davinci-003 as the “classic” instruct-tuned model, the earlier versions like Davinci 1.0.28 Mega represent a foundational moment in large language model (LLM) history.

Davinci 1.0.28 Mega is a specific model snapshot (version 1.0.28) of the original Davinci engine, labeled “Mega” to denote its full parameter size — approximately 175 billion parameters. This model predates instruction tuning, RLHF, and chat optimization. It was a pure base model: trained on a massive corpus of internet text, books, and documents, then released as an API endpoint without additional fine-tuning for conversation. Davinci 1.0.28 Mega

Unlike later "automatic" systems that often fail, 1.0.28 allows full manual control via a 9-point or 16-point mesh leveling routine. For users with warped build plates, this is a lifesaver.

Davinci 1.0.28 Mega taught the AI community several lessons: Newer versions (1

In OpenAI’s internal naming, “Mega” denoted the 175B parameter version of Davinci. There were smaller Davinci variants (e.g., Davinci-Instruct-Beta was 6.7B parameters), but 1.0.28 Mega was the full beast. The “Mega” suffix was visible in API logs and some early documentation, though later dropped as all Davinci models became 175B.

As of 2025–2026, Davinci 1.0.28 Mega is no longer available via OpenAI’s API. The original Davinci engine was deprecated in January 2024. However: For nostalgia or research, one would need to

For nostalgia or research, one would need to run an open-source 175B model like GPT-NeoX-20B (smaller) or OPT-175B (Meta), but those don’t exactly replicate Davinci’s training mix.

Fix: The Mega build uses a standard 115200 baud rate. In OctoPrint, set serial port to /dev/ttyUSB0 and baud to 250000 (auto-detect often fails – manually set 115200).

When you install the full Mega package, you are not just getting firmware – you are getting an ecosystem.

| Feature Category | Specifics in 1.0.28 Mega | |----------------|---------------------------| | Print Resolution | 100–400 microns (adjustable via GUI) | | Build Volume | 7.8 x 7.8 x 7.8 inches (200 x 200 x 200 mm) | | Filament Control | Disables RFID check; supports generic filament profiles | | Temperature Overrides | Extruder up to 260°C; Heated bed up to 110°C | | Print Speed | 20 mm/s to 120 mm/s (stock max was 60 mm/s) | | Connectivity | USB (direct), SD Card (up to 16GB), and restored Wi-Fi | | Slicer Integration | Repetier-Host, Simplify3D, Cura 15.04+ profiles included |