FL Sampler String XYZ

Anyone who's set up a sampler-comparison grid knows the annoying part isn't the sampling, it's typing out "euler,euler_ancestral,dpmpp_2m,dpmpp_2m_sde,..." by hand and hoping you didn't typo a name. FL_SamplerStrings, from the Fill-Nodes pack (filliptm), turns that into a checkbox list: one boolean toggle per sampler ComfyUI actually knows about, and it outputs whichever ones you ticked as a clean comma-separated string.

A sampler is the algorithm deciding how noise gets removed at each denoising step - Euler and its ancestral variant, the DPM++ family, UniPC, DDIM, and a long tail of research variants ComfyUI has accumulated. Which one you pick trades off speed, determinism, and how "settled" the final image looks; some (Euler, DPM++ 2M) converge to a stable result as you add steps, others (the ancestral/SDE ones) keep injecting noise and never fully settle, which reads as more creative variation but less reproducibility.

How it works

The list of toggles is dynamically populated from comfy.samplers.KSampler.SAMPLERS - the same list your regular KSampler node's dropdown pulls from. That means when a new ComfyUI release adds a sampler, it just shows up here automatically; the node isn't hardcoding a stale list. Every toggle defaults to off. Whichever ones you switch on get joined into a single comma-separated string.

The inputs and outputs that matter

There's nothing to "explain" per input in the usual sense - it's ~44 identical booleans, one per sampler name (euler, dpmpp_2m, dpmpp_sde_gpu, res_multistep, uni_pc, and so on), all defaulting to false. You just tick the ones you want included. The single output is a STRING: your selections joined by commas, in the order the sampler list defines them.

That string is built to feed batch/sweep tooling elsewhere in the pack - most obviously FL_KSamplerXYZPlot, which takes exactly this kind of comma-separated sampler list as one axis of a parameter-sweep grid.

How to install it

ComfyUI Manager: search "Fill-Nodes" and install, restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/filliptm/ComfyUI_Fill-Nodes
pip install -r ComfyUI_Fill-Nodes/requirements.txt

This node has no dependency of its own beyond ComfyUI itself - it just reads the sampler registry that's already there - but restarting is still required for the node to appear.

Common issues & troubleshooting

A sampler you expect isn't listed. It's reading straight from your ComfyUI installation's own sampler registry, so if a sampler is missing here, it's genuinely missing from your ComfyUI version too - not this node's fault. Update ComfyUI core if you need something newer.

Nothing selected produces an empty string. If every toggle is off, the output is just "". Downstream nodes expecting a non-empty sampler list (like an XYZ plot axis) will error or produce a degenerate one-item sweep - tick at least one box.

Order confusion. The output order follows the sampler registry's own order, not the order you clicked them. If a downstream node cares about sequence (some sweep visualizations label axes in the order given), don't assume it matches your click order - check the actual string via FL_ShowText before trusting it.