Choosing plastic extrusion processing machinery starts with a fork in the road: are you welding plastic rod in place, or are you feeding pellets through a screw to create filament, sheet, or profiles? The four machines here cover both sides of that split. One is an extruder built around welding rod, two are bench single screw units, and one is a compact single screw filament extruder. The practical gap between them is not just the feature list; it is whether your workflow needs weld-rod work or an actual extrusion line.
Quick take
- The Weldy EX2 EX3 Plus Plastic Extrusion Extruder Machine + Welding Shoes is the only welding-rod unit in this set and the least expensive listed option.
- The Desktop SJ35 Single Screw Extruder Machine Mini Plastic Extrusion Machine is a single screw bench machine with a wide range of listed applications.
- The 3D Filament Single Screw Extruder is the compact, experiment-oriented model, with a 2.5 mm nozzle default, but the unit does not include the motor.
- The Single Screw Extruder Plastic Extrusion Processing Machine 110V Speed Adjustable from TECHTONGDA is the speed-adjustable bench system, with a 25 mm screw and a 0.1-2 kg/h output range.
Listed prices at a glance
| Machine | Listed Price | Price Bar | Best For |
| Weldy 230V 3000W Extruder with Welding Shoes | USD 144.52 | | Welding rod extrusion |
| Desktop SJ35 Single Screw Extruder | USD 1,899.00 | | Broad bench applications |
| 3D Filament Single Screw Extruder | USD 227.99 | | Small-batch filament |
| TECHTONGDA Single Screw Extruder | USD 1,999.50 | | Speed-adjustable extrusion |
Decision matrix
- Choose the Weldy extruder if your job centers on 3-4 mm plastic welding rod and you want the lowest listed price in this comparison.
- Choose the Desktop SJ35 if you need a single screw machine for bar, pipe, granule, sheet, film, profile, or filament work.
- Choose the 3D Filament Single Screw Extruder for compact filament experiments.
- Choose the TECHTONGDA speed-adjustable bench system when speed adjustment from 0-25 r/min matters and you are building a bench setup with auxiliary equipment.
Product notes
230V 3000W Weldy EX2 EX3 Plus Plastic Extrusion Extruder Machine + Welding Shoes
This is the only model here built around welding rod rather than screw-driven filament. It is new, with 3000W of power, 230V input, and 3-4 mm welding rod compatibility, and the product title includes welding shoes. At USD 144.52, it gives you the lowest entry point in this group. The trade-off is that its 230V input is a different power requirement than the other voltage-specified models here, so it belongs in a 230V setup.
Desktop SJ35 Single Screw Extruder Machine Mini Plastic Extrusion Machine
Here is the used option in the lineup. The Desktop SJ35 is listed at USD 1,899.00 and brings a 35 mm screw with an L/D ratio of 13:1 at 110V. The application list is broad, covering bar, wire, pipe, granule, sheet, film, profile, filament, and pelletizing, with plastics spanning PE, PP, PVC, ABS, HDPE, PLA, and more. That gives you a reason to choose it if you want one bench unit for varied materials. The clear limitation is the used condition, and the price sits near the top of this group.
3D Filament Single Screw Extruder 110V/220V Plastic Extrusion Processing Machine
At USD 227.99, this sits between the Weldy and the two bench machines in price, but it is aimed at a different job: turning raw plastic into 3D filament. The 2.5 mm nozzle is the default and a 1.75 mm nozzle is available separately; the unit also does not include the motor. A one-year manufacturer warranty is part of the specifications. What makes it worth considering is the compact, three-heating-coil configuration and its purpose for experimental or small-batch filament extrusion. The limitation is the missing motor: you are not getting a self-contained machine, and you also need to account for the separate 1.75 mm nozzle if that is your filament size.
Single Screw Extruder Plastic Extrusion Processing Machine 110V Speed Adjustable
The TECHTONGDA model is the top listed price in this comparison at USD 1,999.50, and it brings a direct speed-control package: a 25 mm (1 inch) screw, 16:1 L/D ratio, and a 0-25 r/min speed range. The specified output capacity of 0.1-2 kg/h makes it a bench-scale, not production-scale, machine. It is also described as the mother machine-tool for plastic extrusion and still needs auxiliary equipment like moulds, cooling, hauling, winding, or cutting to finish products. The reason to choose it is the speed adjustability and the 250W motor/400W heating combination; the limitation is that you are buying the extruder, not the full line, and the 6-month manufacturer warranty is shorter than the 3D filament unit's 1-year warranty.
Final recommendation by use case
- Welding-rod work: pick the Weldy extruder with welding shoes.
- Broad bench work where used condition is acceptable: pick the Desktop SJ35 Single Screw Extruder Machine Mini Plastic Extrusion Machine.
- Compact 3D filament experiments with extra motor planning: pick the 3D Filament Single Screw Extruder.
- Speed-adjustable bench production: pick the TECHTONGDA Single Screw Extruder Plastic Extrusion Processing Machine.
