For some time now we have been seeing in the 3D printing scene a type of stepper motors that include electronics in the back and to which a 9. You will probably wonder what they are for and what advantages they can offer us when mounting them on our printers, so in this article we will try to shed some light on them.

These motors are called Closed-Loopand their main function is not to lose steps in any of their operations during the printing process. The process is relatively simple, just keep reading our article and you will discover how they do it. Today we will briefly discuss the new engines of the company Makerbasealready well known for its electronics, which has developed two versions of servo motors for NEMA17 and NEMA23 specifically Servo42b and Servo57b respectively.

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When managing the movements of our stepper motors, tiny electronic boards called drivers are used. And it is very important to know the role that these components play when talking about any type of motor whether servo or not.

The drivers are in charge of carrying out the different calculations that our 3D printer requires in order to build the parts that we request. They are certainly an essential component in our hardware and choosing good drivers is quite important.

MKS TFT35 Display: Latest updates v106 and v107 available

Before continuing I recommend that if you have a few minutes you read a very interesting article that we wrote a while ago called TMC Drivers: Guide to the best drivers and their technologies for 3D printing. In it we make an interesting introduction to the Trinamic brand drivers, today one of the most used in our printers, and that offer us a series of great features. A servo or servo motor is a drive element that controls speed, torque, and positioning.

But what exactly does this mean? It means that they have an encoder or decoder that sends the motor position to the controller. As a result of this process we obtain a very precise and reliable positioning in this type of engine. However, these systems require fine-tuning of their parameters and these extra control components also add extra to the cost of the device. A general rule is that stepper motors perform well in applications that operate at or below rpm ranges.

This is because at higher speeds the motors lose torque quickly. However, servo motors can operate in a wide speed range without this marked loss of torque. And this makes them a more suitable choice for different types of scenarios that may arise. In the case of servo motors these are a better technology to use in applications that require high torque at high speeds. As in the case of CNC machines or 3D printers where a large volume has to be moved for example, a very heavy bed.

They allow to mitigate this problem in part but without an exact positioning they are not able to recover the position in case of loss of steps. Its way of mitigating it is by adjusting the definition of steps dynamically, providing more current when necessary, etc.

But as we have commented, a good configuration of your machine will greatly limit any loss of steps. One of the problems that may appear on the scene when we are making a 3D part is the possible loss of steps during the printing process. This may be for different reasons. It goes without saying that this completely destroys our printed part, or leaves it at least imperfect. And all this, no matter what the reason, happens for a simple reason.

When our driver sends information to the motor to indicate how many steps it has to turn, it does not receive any confirmation from it. The driver performs an act of faith and will always trust that the engine has performed its function correctly.

But this is not always the case. There is no bi-directional communication between the driver and the motor and therefore no validation or verification that a command from the driver to the motor has been successfully completed. To overcome this small problem, the Makerbase MKS Servo42b engines have a bit microcontroller that constantly receives information on how many steps have been sent to each engine.

If the steps sent from the driver to the motor differ with those that have been carried out, the microcontroller will inform us with a flashing blue LED and will give the order to complete the remaining steps.

In this way we will not have any loss of steps in our printing.

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Apr 25, Packages 0 No packages published.If you are a user of this type of screens on your 3D printer, I recommend that you update to the latest firmware version available, in order to enjoy all the added improvements. New firmware can be found as always available in your Github repositoryready to download. The installation process is very simple. You must download the firmware, unzip the ZIP file, for example on your desktop. The process will start automatically and in a few seconds the firmware will have been completely updated.

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Laser Engraver upgrade with MKS DLC V2.0 and MKS TFT24 v1.1 offline controller

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Closed-Loop Motors: Makerbase MKS Servo42b (Brief analysis)

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