PETG vs HT PETG — parameter comparison and when to choose which

The decision in one sentence: the shared name is misleading — HT PETG is not a stronger variant of PETG but a material for a different class of machine, so before you look at 125 °C, check whether your printer even reaches 300 °C at the nozzle and 120 °C on the bed.

If PETG works well for you, HT PETG looks like the natural next step. In practice it is a change comparable to moving to an engineering material: a different hotend, a different bed, a different chamber, different cooling and a different way of keeping the print on the bed. The manufacturer Porima's official FDM table sets the two side by side, and what it shows is that all they really share is the family name and the look of the surface.

Comparison table

Parameter	PETG	HT PETG
Nozzle temperature	240–260 °C	270–300 °C
Bed temperature	60–80 °C	100–120 °C
Cooling	100%	0–10%
Drying	2–4 h / 30–40 °C	6–12 h / 50–60 °C
Chamber enclosure	open frame	enclosed or open, bed adhesive recommended
Temperature resistance	85 °C	125 °C
Print difficulty	easy	medium
Warping	none	medium
Stringing	high	medium
Layer cohesion	very good	good
Impact resistance	high	high
Flexibility	high	high
Surface finishing	medium	medium
Support removal	medium	medium
Odour	very low	low
Nozzle abrasiveness	none	none
Print speed	high	medium
Finish	glossy, translucent	glossy, translucent
Compatible printers	any desktop FDM	enclosed only
Bambu AMS	compatible	not compatible

A highlighted cell marks the material that is clearly better in that row. Where the values are equal we name no winner. Source: the official FDM technical data table from the manufacturer, Porima. Full data sets: PETG print parameters · HT PETG print parameters.

When to choose PETG

Anything below 85 °C, which in practice is most of what you print. Housings, brackets, supports, guards. The headroom over room temperature and over the self-heating of electronics is enough.

Models where the quality of overhangs and bridges matters. Cooling at 100% against 0–10% is a difference you can see with the naked eye on every hole and every edge hanging in the air.

Production on an open machine, including from an AMS. HT PETG is marked as not compatible with an AMS and requires an enclosure — with PETG both of those constraints disappear.

Large flat parts. Warping "none" against "medium". On a 200 mm panel that is the difference between collecting a finished part and starting again.

Runs against the clock. Speed "high" against "medium", plus two hours of drying instead of twelve. The whole production loop is shorter.

When to choose HT PETG

Parts next to light fittings and power supplies. Places where 85 °C is genuinely exceeded, not just theoretically.

Parts in the engine bay and near heating systems. A declared 125 °C is the highest value in the PETG family and higher than ABS.

Templates and jigs used during heat work. Soldering holders, guides for film welding, workbench fittings that sit next to a heat source.

Housings for equipment that runs continuously and heats up from the inside. Where ordinary PETG starts losing its geometry after a few months.

Parts that have to survive washing in hot water. Headroom above 85 °C gives a margin PETG does not have.

What the table won't tell you

The "270–300 °C" row is in effect a hardware requirement. You need a fully metal hotend rated for work at the top of the range, and a nozzle that will take it. Plenty of popular machines quote a maximum they only reach momentarily, rather than holding it for ten hours of printing. Before you buy a spool, check what your hot end really sustains under full load.

The "bed adhesive recommended" entry is the most honest sentence in the whole HT PETG column. A material with "medium" warping and a 100–120 °C bed sticks less well than PETG, which holds on by itself. Preparing the bed is a separate job here, not a detail.

Cooling at 0–10% reverses everything you learned with PETG. A PETG profile copied across to HT PETG with the fan at 100% will give you layer separation and a print off the bed. The other way round: with the fan almost off, overhangs and bridges come out noticeably worse and have to be designed around with model geometry or supports.

125 °C is the manufacturer's label, not HDT. There is no standard or described test procedure behind it, and it does not mean the part will carry a load at that temperature. It is a value that orders the catalogue, not a test result.

Drying for 6–12 h at 50–60 °C rules out some dryers. Popular filament dryers and converted food dehydrators often top out around 50 °C and will not hold it steadily for twelve hours. With PETG 2–4 h at 30–40 °C is enough, so the difference is about equipment, not just patience.

Where to check this further

• Filament comparison — which material to choose for what — the hub for all ten pair comparisons plus the main table of twelve material families.
• PETG print parameters — the complete set of fields from the manufacturer's table.
• HT PETG print parameters — the full hardware requirements.
• The first layer won't stick — the first problem with HT PETG.
• Warping — with a 100–120 °C bed it comes back in a different form.
• Poor bridging — a direct consequence of cooling at 0–10%.
• Wet filament — 6–12 h at 50–60 °C is a different league of drying from PETG.

Materials to buy: Porima PETG filament 1 kg and Porima HT PETG filament 1 kg.