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The extruder is almost the most important part for 3D printer, also the most difficult part to calibrate. we have made necessary design to prevent "jammed" problem. I can't emphasize anymore how important this is, other sellers don't have this and would cause many problems.

Features:

(1)The extrude is with thermistor sensor.
(2)Compatible with ABS and PLA 1.75mm.

Tips:

While using with PLA filament, please always remember to keep the fan on, otherwise it might get jammed and ruin the hotend. PLA is more easier to get jammed, so it might require some patience to practice.
For ABS, we would also suggest to keep the fan on, as this is also better. also remember to purchase filament from good reputation seller, as the filament is very important!
( default for this is with 0.4mm nozzle, and suitable for 1.75mm filament )

Specifications:

(1)Nozzle:0.4mm
(2)Voltage:12V/24V
(3)Motor Model:SL42STH40-1204A
(4)Nozzle Flow Rate:24cc / h
(5)Thermistor Tpye:NTC 100K 3950
(6)Sports Shaft Speed:10-100mm

Motor Parameters:

(1)Model:SL42STH40-1204A
(2)Step Angle:1.8∘
(3)Rated Voltage:2.55 V
(4)Rated Current:1.7 A
(5)Phase Resistance:1.5Ω
(6)Phase Resistance:2.3 mH
(7)Number of Lead Wire:10-100mm

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Incluye:
1x Mega 2560 board for Arduino
1x USB Cable
1x 3D Printer Controller RAMPS 1.4 Board(Red Color)
5x A4988 Stepper Motor Driver with Heatsink
1x 2004 LCD with control board
1x Smart Adapter
2x FC flat cable

Más información:.
3D printer board Marlin firmware installation guide, pls pay more about attention about the guide and download the correct marlin for the 2004 LCD Caution: 1) Do not plug or unplug and wire or module when power is on, do not even touch the board when power is on or your hand has static charge(you can rmove static charge by touching metal tap) . 2) Always double check power wire is properly installed. If you do not follow above move, you can damage the control board and your 3D printer 3) Pls Confirm that the A4988 driver install correctly on the Ramps1.4.

3D printer board Marlin firmware installation guide: http://osoyoo.com/?p=1370, pls pay more about attention about the guide and download the correct marlin for the 2004 LCD
3D Printer Controller RAMPS 1.4 interfaces an Arduino Mega2560 board. The modular design includes plug in stepper drivers and extruder control electronics on an Arduino-compatible MEGA shield for easy service, part replacement, upgrade-ability and expansion
With LCD 2004, you can easy connect it to your Ramps board using the "smart adapter" included. After connecting this panel to your Ramps you don't need your pc any more, the Smart Controller supplies power for your SD card. Further more all actions like calibration, axes movements can be done by just using the rotary encoder on the Smart Controller. Print your 3D designs without PC, just with a g-code design stored on the SD card.
It is designed to fit the entire electronics needed for a RepRap in one small package for low cost
We are professional factory on making all electronics components based on Arduino and Raspberry Pi. And we also have processional engineer team to offer you tutorials which you can start from beginning. all documents (including code) For all kits from OSOYOO,Detailed tutorials including project introduction and source

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A4988 Stepper Motor Driver:
A4988 Stepper Motor Driver Board is a breakout board for Allegro?s A4988 DMOS Micro stepping Driver with Translator and Overcurrent Protection; please read the A4988 datasheet carefully before using this product.
Low RDS (On) Output
Automatic current decay mode detection / selection
Mix with slow current decay modes
Synchronous rectification for low power dissipation
Internal UVLO
Crossover-current protection
3.3 and 5 V compatible logic supply
Thermal shutdown circuitry
Ground fault protection
Load short-circuit protection
Five selectable step modes: full, 1/2, 1/4, 1/8 and 1/16
Warning: Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver. (More generally, rewiring anything while it is powered is asking for trouble).
Package includes:
1x CNC Shield Board
4x A4988 Stepper Motor Driver

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