3D printing works with a hot nozzle
3D printing works with a hot nozzle

3D printer (2)


3D printing works on the principle of a hot nozzle, guided on 3 axis compared to the piece, which heat and mechanically removing a thread of material plastic (ABS or PLA are the most used) by successive layers on a plate. The CAD estdecoupe in 2D print layers model.

The general principle is quite similar to that of a conventional 2D printer, i.e. to leave a template created on one computer and give a physical representation, concrete.
CAD (computer aided design), 3D printing from a file allows the user to produce a piece (through software that cut sliced) in filing or solidifying material layer by layer, which allows to get a physical part in 3D.
The printing time, variable depending on the room volume and print speeds, is a few hours.






The transmission is ensured by a system of transmission belt / wheel gear and step-to-step motors.
The transmission is ensured by a system of transmission belt / wheel gear and step-to-step motors.

Prusa Mendel


• Type of structure : triangular
• Geometry of beams : threaded tubular
• Guide/transmission :
-On X : movement of the nozzle, with 4 pivots slippery (= zipper), achieved through 2 smooth stems oriented in a horizontal plane. The transmission is ensured by a system of transmission belt / gear.
-On Y : movement of the plateau, with 4 pivots slippery (= zipper), achieved through 2 tigeslisses. The transmission is ensured by a system of transmission belt / gear.
-On Z : movement of the nozzle, with 2 pivots slippery (= zipper), made with 2 screws and 2 stems smooth, oriented vertically. The transmission is ensured by the threaded system.
• Accuracy : All guides are fixed by clamping. Vibration may cause loosening so a reduction in accuracy.
• Fixing : The MAP is provided by nuts and washers. RP stem clamps are Mylar tighten the frame.
• Achievement : Printer simple to build, modify and repair (use of elementsstandards and non-complex parts).
• Motors : 4 Motors-not NEMA 17 to ensure the transmission and an engine down the wire into the nozzle (extrude).
• Price : Between 500 and €600 (homemade).








Editing a Wallace is quick and easy
Editing a Wallace is quick and easy

Wallace and his step-to-step motors


• Type of structure : rectangular 2D
• Geometry of beams : threaded tubular
• Guide/transmission :
X : Movement of the nozzle, with 3 pivots slippery (= zipper), achieved through 2 smooth stems oriented in a vertical plane. The transmission is ensured by a system of transmission belt / gear.
On Y : movement of the plateau, with 4 pivots slippery (= zipper), achieved through 2 smooth rods. The transmission is ensured by a system of transmission belt / gear.
Z : Movement of the nozzle, with 2 pivots slippery (= zipper), made with 2 screws and 2 smooth rods, oriented in a vertical plane. The transmission is ensured by the threaded system
• Precision : The structure is light. The parallelism of the Guide on Z rods is very accurate because PIM is provided by a threaded rod. All the guides are fixed by clamping. The vibrations can cause loosening of the guides, so a reduction in accuracy.
• Fixing : Bad transmission on Z because the PID of the threaded rod is valid only on one of its ends. Therefore, there is no MAP on the top of the threaded rod.
• Achievement : Installation is simple and quick. Most of the non-normalisees parts are 3D printing.
• Motors : 4 Motors-not NEMA 17 to ensure the transmission and an engine down the wire into the nozzle (extrude).









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