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Product Descriptionfor 3D printer partsfor CNC Flexible Coupling Stepper Motor3 mm * 4 mm D 20 L 25 shaft coupler flexible coupling stepper motorFeatures and Advantages:1. All the functions set on a board to solve the problems that Ramps 1.4 is troublesome and has cumbersome combination interface.2. Adopt 4982 as a motor driver, its performance the same as 4988, but 4982 packaged with SOP, and the cooling effect is better.3. The circuit board is made of 4-layer circuit, and is optimized for heat dissipation. Ramps just has 2 layers.4. Using high quality MOSFET tube, the heat dissipation effect is better.5. Adopt special power supply chip, support 12V-24V power input, and solve the heating problem of Ramps voltage conversion chip.6. Accept 24V input, the hotbed current can be reduced to 1/4 with the same system capacity, it solves the heating problem of hotbed MOS tube.7. you can use the open source firmware Marlin, its configuration the same as Ramps 1.4 and can replace Ramps 1.4.8. MKS BASE V1.4 control board can be connected to Ramps 1.4, 12864 LCD and 2004 LCD control board. Buying GuidesShipping & Delivery term:1.We will ship the items within 1-3 working days after the payment is reached.2.We can ship to you by UPS/DHL/TNT/EMS/Fedex/DPEX China Post&HK Post. Pls contact us directly and we will use the way you prefer. 3.We are not responsible for any accidents, delays or other issues that are the responsibility of the shipping service.4.Any import fees or charges are the buyer’s responsibility.Guagranee and payment terms: 1.The guarantee period is 60 days.2.About the payment terms,we can accept Paypal and Western Union or TT in adcance and Alipay,Ecrow terms.Refund & Replacement1. If the items you purchase from our store are not of perfected quality, that is they don’t work electronically to manufacturers specifications, simply return them to us for replacement or refund.2. Any items must be returned in their original condition to qualify for a refund or replacement.3. The buyer is responsible for all the shipping cost incurred.Feedback1.We depend on our customer satisfaction to succeed. Therefore, your feedback is extremely important to us.2.If you are satisfied with our items, please leave us active feedback.3.Contact us before leaving any neagtive or neutral feedback. We will work with you to slove any problems.Please keep us in mind, whenever you need more electronic components!