Mecha Assembly Bay
FluxMecha Assembly Bay is a tested Flux Flux.1 dev prompt for concept art work. It runs at Flux Flux.1 dev · Aspect ratio 16:9 · Steps 28 · CFG scale 3.5, and ships below with the exact prompt text, usage notes, and 2 pasteable variations.
Last tested: July 2026 with Flux Flux.1 dev
Part of the Flux prompt library.
Prompt
Mecha assembly bay, a giant humanoid mecha suspended in scaffolding and being built by robotic crane arms, showers of orange welding sparks glowing on its steel chest, hanging cables and gantries, tiny human workers on the catwalks for scale, cavernous industrial sci-fi hangar, cool steel and teal palette, cinematic wide shot
Settings
- Model
- Flux Flux.1 dev
- Aspect ratio
- 16:9
- Steps
- 28
- CFG scale
- 3.5
How to use this prompt
Scale is everything and Flux won't invent it — add "tiny human workers on catwalks and scaffolding" so the mecha reads as building-sized rather than a toy on a bench. The welding sparks are your only warm light in a cold industrial space, so call them out as the key light: "orange welding sparks casting warm glow on the robot's chest." Crane arms and hanging cables sell the under-construction story — without them you just get a mech standing in a room. Keep the palette cool steel and teal so the spark glow pops; a warm overall grade flattens the contrast that makes the scene cinematic.
Variations to try
- Powered down — kill the welding sparks and light the bay with cold overhead work lamps for a quiet, eerie mood
- Battle-damaged repair — the mecha is scorched and dented, panels open, technicians patching a torn shoulder
Explore collections
What to do next
For developers — copy this prompt as JSON
{
"title": "Mecha Assembly Bay",
"prompt": "Mecha assembly bay, a giant humanoid mecha suspended in scaffolding and being built by robotic crane arms, showers of orange welding sparks glowing on its steel chest, hanging cables and gantries, tiny human workers on the catwalks for scale, cavernous industrial sci-fi hangar, cool steel and teal palette, cinematic wide shot",
"model": "Flux",
"model_version": "Flux.1 dev",
"settings": {
"aspect_ratio": "16:9",
"steps": 28,
"cfg": 3.5
},
"style_tags": [
"sci-fi",
"cinematic"
],
"use_case_tags": [
"concept-art",
"gaming"
],
"source_url": "https://promptkoi.com/prompts/flux/mecha-assembly-bay/"
}The whole library is available as an open JSON dataset · developer docs.
