Choco Extruder set 3DRAG - in kit
Special extruder that allows the 3Drag to print objects in chocolate.
From replace that used for extruding plastic materials (PLA, ABS, etc.), Is made from an ordinary 60 ml syringe, the piston of which is driven by a stepper motor NEMA17, and by a cylindrical heater which maintains at a temperature of about 32-33 ° C, the chocolate contained in the syringe. The chocolate to be extruded through the syringe needle (having an internal diameter of only 0.9 mm) should be dissolved; fusion is obtained by suitably activating the heater in which is inserted the syringe without exceeding the threshold of 33 ° C so as to prevent losing the "quenching" chocolate. For this reason, the control board constantly detects the temperature of the heater by means of an NTC thermistor 100 Kohm installed directly on the body of the cylinder heater aluminum. The loss of "hardening" of the chocolate to prevent print objects that grow in height as the chocolate itself would not be able to solidify at room temperature (24-27 ° C).
The set is composed of a 60 ml syringe for medical use with central "Luer Lock" (brand FarmaTexa) which is applied to a standard needle 1.2 mm suitably shortened (L total = 33.5 mm); a cylindrical aluminum body with outer diameter of 35 mm and inner of 31,6mm, duly drilled; a cylindrical block of aluminum (in which is fitted a cylindrical cartridge heater 15V / 33W) duly drilled; a shirt cover needle (made from a rod of aluminum) that allows you to "keep warm" the needle of the syringe with the press; an aluminum IGUS (ref. NS-01-27) from 27x300 mm, which is also the backbone of the entire extrusion unit; a shoe IGUS (Series 27 cod. NW-02-27) that is anchored to the plunger of the syringe by means of a bracket made of Delrin; an aluminum plate of 4 mm thickness for the fixing of the toothed wheel; an angle bracket for fixing aluminum extruder to the arm of the printer 3Drag; M8x190 mm threaded rod for actuating piston syringe; 2 Ball Bearing 8x22x7 mm with dust; supports for the fixing of the heater, the syringe and the motor, toothed wheel 43 teeth (Ø66,2 mm) and the pinion 10 teeth (Ø 17.6 mm) made of Delrin; a heating element 15 V / 33 W and an NTC thermistor 100 ohm axial. Attention! The motor NEMA17 2.5 A for the actuation of the piston of the syringe is not included; You can use one of this series on the extruder printer. On the cylinder port-syringe can wrap a heating cartridge additional (optional) type "flat" with a supply voltage of 5 Vdc which allows a more uniform heating of the syringe, useful in the case where the printer is being used in cold areas .
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