If you're shopping for plastics rubber processing machinery to make 3D printing filament from PEEK, PCL, ABS, PLA, PETG, TPU, or TPE, the two TECHTONGDA single-screw extruders are easy to confuse. Both run on 110V, use a 25mm screw diameter, have a 250W motor, and list a 0.1-2kg/h maximum output capacity. Each handles heating and extruding plastic raw materials, while auxiliary equipment such as moulds, cooling, hauling, winding, or cutting machines finishes the product. The real question is whether you want an adjustable speed range or a clearly stated 350°C maximum heating temperature.
Quick verdict
The TECHTONGDA Single Screw Extruder (Speed Adjustable) is the stronger everyday pick when you want a wider speed-adjustment range. The TECHTONGDA SJ25 is the pick when you need a stated maximum heating temperature. Both are new single-screw machines from TECHTONGDA.
Single Screw Extruder vs SJ25: Side-by-side
| Compact name | Listed price | Price bar |
| TECHTONGDA Single Screw Extruder (Speed Adjustable) | USD 1,999.50 | |
| TECHTONGDA SJ25 Single Screw Extruder | USD 2,085.86 | |
The listed prices are USD 86.36 apart. The speed-adjustable model specifies a 0-25 r/min speed range and a 16:1 L/D ratio. The SJ25 specifies 0-20 r/min, a 14:1 L/D ratio, and a 350°C maximum heating temperature. The SJ25 also provides a clear model designation and a compatible model reference to SJ25.
Where each product wins
- TECHTONGDA Single Screw Extruder (Speed Adjustable): wins on speed-adjustment headroom.
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Product notes
TECHTONGDA Single Screw Extruder (Speed Adjustable)
This is the model to pick when you want a compact unit with listed dimensions for bench planning. TECHTONGDA lists this extruder in white and gives physical dimensions of 15.7 inches long and 7.8 inches wide. It shares the single-screw, 110V, 250W architecture and the 0.1-2kg/h output capacity with the SJ25. One limitation to weigh: the SJ25 is the machine that carries the stated 350°C maximum heating temperature, so heat-critical buyers should compare that number with their material requirements before choosing this model.
TECHTONGDA SJ25 Single Screw Extruder
This is the option to choose when you want a stated 350°C maximum heating temperature in a single-screw plastic extrusion machine. The SJ25 model designation makes it straightforward to reference in a small extrusion setup, and the compatible model field names it as SJ25. The trade-off is the shorter 14:1 L/D ratio compared with the speed-adjustable model, and the speed range stops at 20 r/min rather than 25 r/min. If you process materials that need a known heat ceiling, the 350°C figure is a clearer planning reference. That makes the SJ25 the machine to select when heat matters more than speed headroom.
Final choice by use case
- Choose the TECHTONGDA Single Screw Extruder (Speed Adjustable) for a wider adjustable speed range.
- Choose the TECHTONGDA SJ25 for a stated 350°C maximum heating temperature and a dedicated SJ25 designation.
