Comparing ABS and HIPS as alternatives misreads what HIPS is for. They print at nearly the same temperatures, warp in the same way, and want the same enclosure — and that similarity is not a coincidence, it is the design intent. HIPS exists on a printer chiefly so it can be printed alongside ABS and then dissolved away.
Treat this less as a choice and more as a question about whether you have two extruders.
Why they behave identically on the machine
Both are styrenics. HIPS is polystyrene toughened with rubber; ABS is a styrene-acrylonitrile copolymer with butadiene rubber. The stored figures follow:
| ABS | HIPS | |
|---|---|---|
| Nozzle | 230–260 °C | 230–250 °C |
| Bed | 90–110 °C | 90–110 °C |
| Shrinkage | 0.4–0.8% | 0.4–0.7% |
| Enclosure | required | required |
| Density | 1.02–1.08 g/cm³ | 1.03–1.06 g/cm³ |
| Tensile | 30–45 MPa | 20–35 MPa |
Two materials that share a bed temperature, a chamber requirement and a contraction rate can be printed together without either compromising the other. That compatibility is the entire product.
What the pairing costs
Soluble support is not free and it is worth seeing the difference on one job.
A 160 g ABS part running 8 hours on a machine that draws 120 W. Filament $24/kg; the machine charged at half a dollar for every hour it runs; power billed at the 17.5-cent United States residential average; one print in eight thrown away, entered as 12%. That comes to $9.10 per good part.
The same part printed with HIPS support and the purge tower a dual-material change requires — call it 240 g of total filament across the two spools at a blended $26/kg, and 11 hours because every tool change costs time: $13.60. Filament goes from $3.84 to $6.24 and machine time from $4.00 to $5.50. The eleven hours is the input to distrust. It is a guess at what the tool changes cost, and your own slicer's estimate for the same dual-material plate belongs in the cost calculator in its place.
Then add the limonene, which is neither cheap nor quick — dissolution runs for hours and the solvent is consumed.
Against that, you get internal geometry that no mechanical support can produce and a surface with no support scarring at all. For a one-off display piece with a complex interior, that is worth paying for. For a batch of brackets, it very obviously is not.
Where HIPS stands on its own
It is not purely a sacrificial material, and there are three cases where it is the part rather than the scaffold.
Lightweight airframes. HIPS is the lightest styrenic here and it is stiff for its mass. Radio-control model builders use it for structure that will be skinned or covered.
Model bases and mock-ups. Cheap, easy to sand, takes paint well, and dimensionally close enough to ABS that a HIPS prototype tells you what the ABS production part will do.
Parts you intend to dissolve later. Sacrificial cores for composite layup or for casting: print the core in HIPS, build around it, dissolve it out.
Outside those, the tensile figures tell the story — 20 to 35 MPa against ABS's 30 to 45. The stored weakness list says it plainly: HIPS is not really a structural material in its own right.
Getting the pairing to actually work
Two extruders and two compatible spools do not by themselves produce a clean soluble-support print, and the failure modes are specific.
Oozing between changes. Both materials are liquid at the same temperature, so the idle nozzle drips onto the part unless the purge tower and the wipe settings are doing their job. This is where most of the extra material goes and it is not optional.
Interface adhesion. HIPS and ABS bond well to each other — that is what makes the support hold — which means the interface layer has to be tuned to release rather than to grip. Too dense and you are dissolving a weld; too sparse and the supported surface droops.
Dissolution time scales with thickness. Limonene works from the outside in, and a thick support column takes many hours. Designing the support to be thin, or pausing to agitate the bath, makes the difference between an overnight soak and a two-day one.
Both spools must be dry. Wet HIPS prints as badly as wet ABS, and on a dual-material print you get both sets of defects on the same part.
What each one is bad at
ABS's problems are well known and they apply to HIPS unchanged: warping without a chamber, ultraviolet degradation outdoors, and styrene emissions in an unventilated room. Neither material is the answer to any of those, and PLA against ABS covers the enclosure and ventilation gate before any of this becomes relevant.
HIPS adds one of its own: it needs limonene. Without it there is no dissolution workflow, and limonene is a solvent with a strong smell, a real cost per litre, and a disposal question. Any workflow that assumes soluble support without budgeting for the solvent is incomplete.
Before you buy a spool of HIPS
Check all of these, because any one of them missing turns the purchase into a shelf ornament:
- A second extruder or a tool-changing machine. Single-extruder printers cannot use soluble support at all.
- An enclosure that holds temperature, since HIPS warps exactly as ABS does.
- A supply of limonene, and somewhere ventilated to use it.
- A container large enough to submerge the part, and the patience for a soak measured in hours.
- Somewhere to put the used solvent afterwards.
Choosing, practically
One extruder. The comparison does not arise. Print ABS, use mechanical supports, and read when supports are worth it.
Two extruders, and the part has enclosed internal geometry. This is the case HIPS was made for. Print it.
Two extruders, and the part just has some overhangs. Mechanical support in ABS is cheaper and faster. Save the HIPS for geometry that needs it.
You want a light, sandable prototype. HIPS alone, and it is a pleasant material to work by hand.
The useful framing is that HIPS is a process capability rather than a material choice. If you own the second extruder and the solvent, it unlocks parts you otherwise cannot make. If you do not, nothing about HIPS makes it a better ABS.