The short version: the best support filament for most people is eSUN PVA, because it dissolves in plain tap water, bonds reliably to PLA and is stocked everywhere. Step up to Polymaker PolyDissolve S1 when you need supports under PETG or TPU as well, drop to SUNLU PVA while you are learning the workflow, use HATCHBOX HIPS whenever the model is ABS or ASA, and reach for Polymaker PolySupport when you want a clean interface without an overnight soak.
Support filament is the material you print around the part rather than into it. A second extruder lays it down under overhangs and inside cavities, and when the job finishes you dissolve it or snap it off, leaving surfaces that ordinary supports would have scarred. It solves geometry a single nozzle genuinely cannot — captive moving parts, internal channels, enclosed voids — and it is wasted money on anything you could have supported with the model material and cleaned up with pliers.
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Three kinds of support material, and which one your printer can run
The category splits by how the support leaves the part, and that decision is made for you by what the model is printed in.
Water-soluble (PVA and its cousins) goes into a bucket of warm water and disappears. It bonds well to PLA, prints in the same 190–215°C range, and needs no solvent, no ventilation and no special handling beyond keeping it dry. Its limit is heat: PVA starts to degrade and char somewhere above 220°C, so it cannot sit next to an ABS nozzle running at 245°C in a hot chamber. The upgraded soluble materials — Polymaker's PolyDissolve S1 and the BVOH-based spools — widen that window and adhere to PETG and TPU, which plain PVA does inconsistently.
Limonene-soluble (HIPS) is high-impact polystyrene, and it exists for ABS and ASA. It prints at 230–245°C on a hot bed inside an enclosure, exactly where those materials live, and it dissolves in d-limonene — a citrus solvent that leaves ABS completely untouched. It costs roughly what a spool of PLA costs, so it is the cheapest soluble support by a wide margin. The trade is the solvent: you need ventilation, a sealed container and the patience for an eight-to-twenty-four-hour soak.
Breakaway is neither. It is a material engineered to bond just well enough to hold an overhang and just poorly enough that the interface fails under thumb pressure. Nothing dissolves, nothing dries, and the part is finished the moment it comes off the plate. It will not reach into a sealed internal cavity, because your fingers cannot either — but for external overhangs on a cosmetic face, it is the fastest clean result available.
| Support | Model material | Removal | Rough cost | Best for |
|---|---|---|---|---|
| PVA | PLA (PETG/TPU variably) | Warm water, 4–12 h | High | Internal cavities, captive parts |
| PolyDissolve S1 / BVOH | PLA, PETG, TPU | Warm water, 2–6 h | Highest | Mixed-material shops |
| HIPS | ABS, ASA | d-Limonene, 8–24 h | Low | Enclosed ABS work |
| Breakaway | PLA, PETG | By hand, seconds | Medium | Cosmetic external overhangs |
Before any of this, check the machine. Support filament needs a second material path — a dual extruder, an IDEX carriage or a multi-material unit feeding one hotend. A single-extruder printer with one spool cannot use it at all. If you are still choosing, our guide to the best multi-colour 3D printers is the same hardware question from the other direction: every machine that can print two colours can print a support material instead of the second colour.
The picks
Best overall — eSUN PVA
The default because it is the one you can actually buy. eSUN's PVA is stocked by every major retailer, arrives vacuum-sealed with desiccant, and holds tolerance well enough that a multi-material unit will not jam on it mid-job. It bonds to PLA firmly, releases in plain warm water, and behaves the same way spool after spool — which matters enormously on a material whose failure mode is discovered eleven hours into an overnight print. Print it at 195–205°C with the bed no hotter than the PLA needs, and keep it in a dry box the entire time.
Best material range — Polymaker PolyDissolve S1
Buy this when PLA is not the only thing you print. PolyDissolve bonds to PETG and TPU as well as PLA, which plain PVA does unpredictably — PETG in particular has a habit of either refusing to stick to PVA or fusing to it permanently, and neither outcome is recoverable. It also clears noticeably faster in warm water, cutting a twelve-hour soak to a few hours. You pay for both properties, so keep a spool for the awkward jobs rather than running it as your everyday support.
Best budget — SUNLU PVA
Support filament has a learning curve that is mostly paid in ruined spools, and this is the one to ruin. Dialling in interface layers, purge volumes and Z-gaps takes several attempts, and so does discovering how fast PVA goes wet in your particular room. SUNLU's is consistent enough for that education and cheap enough that the first mistakes do not sting. Once the workflow is settled, most people move up — but not before.
Best for ABS and ASA — HATCHBOX HIPS
If the model is ABS or ASA, this is not a preference, it is the only workable answer — PVA cannot survive the temperatures those materials print at. HIPS runs happily at 230–245°C on a 100°C bed inside a closed chamber, bonds to ABS well without welding to it, and dissolves in d-limonene while leaving the model completely alone. It is also a perfectly good model material in its own right, so a spool is never wasted. Ventilate the soak, keep the solvent in a sealed jar, and reuse it — limonene lasts across many parts. Our ABS filament guide covers the model side of the same setup.
Best breakaway — Polymaker PolySupport
For the job where you want a second extruder's clean interface and you want the part tonight. PolySupport holds an overhang through the print and then peels away under thumb and pliers, leaving a surface far smoother than same-material supports because the interface was designed to fail. No water, no solvent, no drying, no waiting. Its limit is reach — anything your hands cannot get to, breakaway cannot leave. Use it for external cosmetic overhangs and keep PVA for the sealed internal geometry.