All posts by: Cohesion3D

  • We’ve launched a high quality rotary attachment that will work in the K40 and with other lasers, with the Cohesion3D LaserBoard directly and with other laser controllers!

    Cohesion3D Rotary


    We wanted to maximize the use of space, make it modular, and easily adjustable.

    • Tool-less adjustment is standard on all models. Thumb screws allow you to move the idler system forward and back, up and down, and the wheels closer and farther apart.
    • Using the side plates to secure the vertical beams to the horizontal beams instead of angled brackets allows you to bring the idler wheel plate all the way down, and slide the idler assembly all the way back.
    • The vertical beams have open end caps. The Idler Plate can slide out the top and be flipped, so you can get the wheels to be really low and close together, or really high and apart, and all the other combinations of that. Everything from a thin pencil to the high neck of a wine bottle is possible with this. You can also pull the caps off and mount the the idler wheel plate from the rear to really maximize the object length the rotary supports. This should get you around 250mm of total supported object length.
    • The rotary now comes fully assembled – this is not a kit!

    What add-ons should you get?

    The response is “It depends” and also “Yes”. Honestly, it’s all useful stuff, otherwise we wouldn’t be offering it. Let’s break it down:

    • Natural (Silver) vs Black Extrusion. If this was just a color question, I’d say “Hey, the black extrusions will make it all black which is super sleek, and combined with the red accents of the rings it looks like the finish of a certain race car that I really like, but it’s your call whether that’s important to you.
      However, the black extrusions DO have a functional enhancement – we’re etching alignment marks into both the horizontal and vertical beams. This way you can make sure all the moving components of the idler system are aligned and not crooked when you adjust them.
      The marks are spaced every 3mm and are patterned 4 short followed by 4 long so you always know exactly where you are and don’t have to count from the end every time.
    • The Small Drive Wheels allow for larger items to be placed on the rotary while still maintaining the low profile that fits in the K40.Easily swap between the default large drive wheels and these small drive wheels – just unscrew one nut per wheel, slide the wheel off, put the new one on, and put the nut back on:
      Set contains 2 small drive wheels with silicone rings installed. Requires 4mm hex key and 10mm hex wrench (included with the Cohesion3D Rotary itself) to swap the wheels.Please note that while this will allow you to fit somewhat larger items inside a small laser like the K40 than our stock larger drive wheel will allow, you may still need to cut the floor out of the K40 to fit even larger items.
    • The Tension Arm holds small or lightweight objects to the drive wheels and minimizes slipping. It is great for pencils, pens, flashlights, and other small objects. Install it in seconds with 2 thumb screws – no tools required. It is able to hold cylindrical objects down to 4mm and is for use with the stock large drive wheels.
      The tension arm assembly comes like this:

      And here it is mounted and in use:

      When you have small diameter objects like this pencil, the large drive wheels have enough traction to keep it retained on the drive end, but the other end tends to fly up off the idler wheels. The longer the object, the worse it gets. The tension arm solves this.
    • Replacement Silicone Rings. The red rings on the wheels will eventually wear out and can crack. They offer a lot of grip, so having to replace them every so often isn’t a bad thing given the performance they offer. It depends a lot a lot on many factors including how much the rotary is used and environmental factors. We will have replacement rings available for sale separately but you can get the replacements cheaper by adding them to your rotary purchase – that way you won’t be down waiting for replacements and will save on shipping.

      There’s a set for the stock large drive wheels and small idlers, and another set for the small rings used on the small drive wheels if you got those.
    • DSP Wiring Connectors. If your laser uses Nema 17 stepper motors, you can unplug the Y motor from the Y black box stepper driver and plug the rotary motor directly into the Y stepper driver instead. Some lasers have a round “aviation connector” to assist with this. This kit contains a 4 pin terminal block and both male and female aviation connectors to be prepared for these options.
    • DSP External Stepper Driver with 3 Pin Terminal. If your laser has larger NEMA 23 steppers, Servo Motors, or 3 Phase, you will have to wire in a separate external stepper driver that uses the same STEP and DIR signals as the Y driver, and then switch between them. This kit contains an external stepper driver and an additional 3 pin terminal block that commonly connects on the DSP controller side. You should also get the wiring connectors above to be most prepared.


    So what should you get?

    Here’s my opinion:

    • Black Extrusions – the alignment marks are actually super helpful.
    • Small Drive Wheels – If you want to do anything remotely large without having to cut the floor out of the K40.
    • Tension Arm – if you’re doing anything small, it’s definitely going to be helpful.
    • Replacement Rings – entirely up to you and how important avoiding downtime is.
    • Electronics Packs – Depends on what laser and controller you have.



    • Plugs directly into Cohesion3D LaserBoard Motor Port A. Just modify a few settings on the board’s SD Card and you are rolling.
    • On the stock K40 controller like the M2Nano and similar, can unplug the Y motor and plug the rotary in in its place. “If the motor spins, the rotary works” is the extent of support we can provide for this application. Same situation for other laser controllers that only have X and Y stepper drivers built in.
    • For Ruida, Trocen AWC, and other DSP Controllers that use external stepper drivers, there are several options. You should have black box external stepper drivers for X and Y.
      • If your laser uses Nema 17 stepper motors, you can unplug the Y motor from the Y black box stepper driver and plug the rotary motor directly into the Y stepper driver instead. Some lasers have a round “aviation connector” to assist with this. The “DSP Wiring Connectors” kit contains 4 pin terminal block and aviation connectors to be prepared for these options.
      • If your laser has larger NEMA 23 steppers, Servo Motors, or 3 Phase, you will have to wire in a separate external stepper driver that uses the same STEP and DIR signals as the Y driver, and then switch between them. The “DSP External Stepper Driver with 3 Pin Terminal” kit contains an external stepper driver and an additional 3 pin terminal block that commonly connects on the DSP controller side.
      • You will need wire in various sizes, tools, and the capability to work through this.
    • For any other application/ controller, please post in our forum and we will be happy to assist you.


    Cool pics:



    All the parts are here for the first batch, we have already set up the production line and built many of the sub-assemblies. We will be assembling the rotary’s to order so we are saying that we will ship orders in 3-5 business days. It is available for purchase now. A huge amount of work has gone into this and we really hope you like it.


    Cohesion3D Rotary

  • There are a number of add-on accessories presented on the Cohesion3D LaserBoard product page – How do I know what I need?

    For starters, you’ll probably be buying the Cohesion3D LaserBoard. This already comes with its own Power Supply and a pre-programmed SD Card with the firmware and config files for Smoothie firmware. The same board can also run GRBL-LPC firmware, so you would just put a different file on the SD Card, there is no need to specify anything at the time of purchase. The included power supply is just to power the board with a clean, sufficient source of 24 volts, since the Laser Power Supply can’t do a good enough job of it and will result in unstable operation if you try. However, we leave the Laser Power Supply to drive the laser tube. It does a decent job of that. You can read more about all that here: The Cohesion3D Power Supply

    The board works with LightBurn Software, so you’ll most likely be getting that as well. LightBurn is layout, editing, and control software for your laser cutter. With LightBurn you will be able to:

    • Import artwork in a variety of common vector graphic and image formats (including AI, PDF, SVG, DXF, PLT, PNG, JPG, GIF, BMP)
    • Arrange, modify, or even create new vector shapes within the editor
    • Apply settings like power, speed, number of passes, cut order, and much more
    • Send the result directly to your laser cutter

    LightBurn is a native application that will run on Windows, OSX, and Linux. Yes, you can use your laser with your Mac when you upgrade to Cohesion3D with LightBurn.

    The Official LightBurn Camera will allow you to:

    • Monitor your laser.
    • Position designs on your work material.
    • Trace artwork directly from designs on the bed of the laser.

    The camera is super cool and lets you scan in physical designs to the program and align your designs onto physical work pieces on your laser bed. You can see a demo here:

    Graphic LCD Screen + GLCD Adapter. The Graphic LCD Screen provides a heads up display with Machine Position and Status. The click wheel allows you to navigate menus to do things such as jog the machine. Finally, you can save gCode job files to the SD Card in LaserBoard and use the GLCD to run that, all without having to be tethered to a computer. Make sure you get both the Graphic LCD Screen and the GLCD Adapter to be able to connect it to the LaserBoard – you cannot connect it without the GLCD Adapter!

    High Quality USB Cable. The Cable that comes with the K40 (and other Chinese devices in general) is known to not work properly and can cause issues communicating with the Cohesion3D Boards.

    4A External Stepper Driver and External Stepper Driver Cable [4 Pack]: LaserBoard has built in stepper drivers for X, Y, Z, and A. These are Trinamic stepper drivers rated up to 1.2 amps (RMS value, which is different than the peak which is how most motors are rated). They can work up to a point, then you will need external drivers. You should look at the motor rated currents, but as a rule of thumb, I say that Nema 17 Steppers up to 48mm long are OK, as long as you are not putting way too much load on them. Here are some quick tips to know whether you need external drivers:

    • If you have an M2Nano style board, it has built in drivers for X and Y. You should be OK with the built in drivers. If this is a larger machine than a K40, just know that you will have to change some settings like the driver currents in the board’s config file. We have guidance for this on the forum.
    •  If you have our Cohesion3D Rotary or the one from LightObject, it should work directly off the board with the built in drivers, just plug it into the A motor port on LaserBoard and set your steps per mm and max speed values in the config file (get these from the rotary manufacturer).
    • The small Z table from LightObject also uses a moderately sized Nema 17, it should also be OK with the built in drivers.
    •  Other Z tables that use larger stepper motors will definitely require an external stepper driver.
    • If you already have external drivers because your machine came like that, or are working on a monster laser cutter :slight_smile: then you might need external drivers and the External Stepper Driver Cables to wire them.

    Note that if you are adding external stepper drivers to your machine, you need a separate 24v power supply to power them like this:


    Alternatively, if you do not want to handle AC wiring, or just for simplicity, you could use additional power bricks from us to power the external stepper drivers. This kit would work nicely for that:

    Cohesion3D Mini Power Supply Upgrade Kit

    So, what all do you need to get? Well, at the least, we’d recommend the LaserBoard, the LightBurn Software, and the good USB Cable. The Camera is super cool and lets you do things with your laser that other machines that cost $6,000 advertise in their marketing videos. Then you can add the screen if you want the heads up display. And external drivers if you need them. Easy. Post on our Community Support Forum if you have any questions or need help with anything.