Sampler Settings Small (Flux)

Flux workflows are simple in one respect: you almost never touch CFG, and you almost never touch denoise unless you're img2img. The knobs you actually live on are sampler, scheduler, steps, and guidance. Sampler Settings Small (Flux) bundles exactly those five numbers into a single pipe - it's the "keep it minimal" member of the RvTools sampler-settings family, and for the majority of Flux generations it's the only settings node you need.

What's in the box

• Sampler - 44 options straight from ComfyUI (euler, euler_ancestral, dpm_2, heun, the CFG++ variants, ...). For Flux, the community consensus settled on euler with a few steps-friendly alternatives; the dropdown doesn't impose anything.
• Scheduler - 16 options plus the useful extras (AYS SDXL, AYS SD1, AYS SVD, OSS FLUX, OSS Wan), so the OSS Flux schedule is already in the list without a separate pack.
• Steps (default 20) - for Flux dev, 20–30 is the comfortable range; distilled Flux models run fine at 4–8.
• CFG (default 3.5) - mostly decorative on Flux, honestly. Flux doesn't really use CFG the way SD1.5 does; leave it and spend your attention on guidance.
• Flux_Guidance (default 3.5) - this is the real steering wheel. It's the parameter the Flux guidance embed responds to. Default 3.5 is a good starting point; drop it toward 2–3 for softer, more stylized results, push toward 4+ if you want tighter prompt adherence.

The node packs all five into a list and returns it on a single pipe output. To use it, pair it with Pipe Out Sampler Settings Small (Flux) (same pack), which unpacks the pipe back into separate wires - sampler, scheduler, steps, cfg, flux_guidance - that you connect to a KSampler or your Flux sampler setup. This isn't a ComfyUI-native pipe type; it's the pack's own convention, so the matching Pipe Out node is required.

Why "Small"?

Compare it to its siblings and the logic becomes obvious. Sampler Settings (Flux) adds denoise plus sigmas and noise-strength fields for advanced Flux sampling; Sampler Settings (Flux+Seed) adds denoise and a seed. Small (Flux) is the version you'd put in a clean text-to-image workflow where you want the settings bundle to stay short and the seed to live on its own node. It's also the one that keeps a shared workflow tidy - one wire carries all five values, so a group that wraps your sampler stays visually compact.

Installing it

Part of ComfyUI-RvTools_v2. ComfyUI Manager → search "ComfyUI-RvTools_v2", or:

cd ComfyUI/custom_nodes
git clone https://github.com/r-vage/ComfyUI-RvTools_v2
# restart ComfyUI

No model files, no extra deps beyond what ships with ComfyUI.

Gotchas

The defaults (CFG 3.5, guidance 3.5, 20 steps) are Flux-flavored - don't copy this node into an SD1.5 or SDXL workflow and expect it to behave, because CFG 3.5 is way too low for those models. And the pack-level caveat: RvTools_v2 is unmaintained, superseded by ComfyUI_Eclipse, and the [RvTools] suffix trips up Manager on old shared workflows. If a downloaded workflow can't find this node, look for the old repo's name first.