Before we get started, it's important to make sure you've landed on the right cleaning tutorial. The Mr Beam II dreamcut [S] can be identified by the small [S] mark on the top right of the laser head cover. Like the Mr Beam II dreamcut, it also has a brass tube for the air supply.

1. Collect your tools:

1: keyboard vacuum cleaner
2: filter mask
3: safety glasses
4: Mr Beam Cleaning Kit
    a: Torx 8 screwdriver
    b: brush
    c: bellow
    d: cotton swabs
    e: microfiber cloth
    f: lens cleaning tissues
    g: glass cleaner

2. Take out the laser head

1. Switch off Mr Beam and plug it off. Allow the laser head to rest for at least 2 minutes before proceeding with the next step, to ensure that the laser unit is fully discharged.

2. If the laser head is in the Home Position of the working area, pull it into the centre by (a) gently moving the x-axis and (b) pulling the laser head into the middle. This way you will have a better grip of the laser head.

3. Unscrew the laser head from the mounting bracket. Put the knurled nut back on the laser head body, this way you will avoid losing any parts during the cleaning process.

4. On the back of the laser head you will find a black clamp which holds the white cable in place. Please pull it out carefully at the corners, about 2 mm… Unplug the cable in the back of the laser head by gently pulling it out.

Gently pull the air tube off the copper tube.

3. Take laser head apart

1. Remove three screws on the back of the laser head, using a 2mm Allen key. Carefully take the laser head apart.

Tip: Because of the adhesive pads on the laser, it might not come off directly on its own, so you can go in at the small holes above and below the laser with the screwdriver and pry the head open.

Tip: Take photos while taking your laser head apart! This way you will have a reliable memory aid later on, when putting the laser head back together again.

2. Carefully unplug the fan cables from the laser module. Make sure to get hold of the white pin jack, don’t pull on the entire socket or directly on the cables, or they might tear! This step is not absolutely necessary for cleaning.

1: laser front
2: copper block and laser module
3 & 4: heat sink
5: fan

4. Clean the laser head

Warning:  Make sure to wear gloves while cleaning or wash your hands thoroughly at the end of the cleaning process. Please put on a filter mask and safety glasses, to prevent potentially dangerous substances and dirt from getting into your eyes or respiratory passages.

1. Heat sink:

Use a hand vacuum cleaner with a brush and clean all rills as well as the recess for the laser channel thoroughly.

2. Fan:

Vacuum off the dirt with a hand vacuum cleaner.

Important: Hold the fan wheel with one finger to prevent it from spinning while cleaning. Otherwise the fan will spin too fast from the vacuum cleaner’s air flow, and might break!

If there is a lot of resin on the fan, it is best to use a resin remover diluted with water to clean the filter with a cotton bud.

3. Laser module:

Vacuum off the dirt here as well.

4. Laser lens: 

Wet one side of the cotton swab with a glass cleaner and carefully wipe the laser lens clean by making rotating movements with the swab. Use the other end of the swab to dry off the lens. 

Please note: Make sure not to touch the laser lens after you have cleaned it. Otherwise you will need to repeat this step.

5. Laser front:

Vacuum off any dust particles. The laser front gets yellow and brown stains from cutting plywood. You can remove those easily by using a napkin and a glass cleaner to wipe the dirt off the laser front.

5. Assemble laser head

1. Plug the cable of the fan back into the socket on the laser board. Please make sure that the pins are in the correct alignment to avoid damaging them (as shown in the picture).

2. Place the inner components of the laser head in the rear half of the heat sink, i.e. the one without the ventilation hole. The fan sits at a slight angle in the heat sink on one edge, to suck in the air from above and push it down onto the laser cooler.

3. In the next step, please close the laser head with the second half of the heat sink so that there are no gaps. If there is a snag somewhere, it is possible that not all the inner components are perfectly placed. You can easily adjust the fan by wiggling it slightly from above until it snaps into place.

Important: Make sure the fan cables are not squeezed between the two sides of the heat sink when they are put together! Make sure the heat sink closes tightly!

4. If everything fits, you can already screw the shortest screw in the bottom right corner, so that the head no longer falls apart.

5. Put the laser front back on the laser head so that it covers the fan hole. Now the position of the threads in the laser front should match exactly with the position of the screw holes in the laser head.

6. Put the other screws on the back of the laser head back in place using an Allen-key.

7. Now you can reinstall the laser head into the Mr. Beam. To do this, insert the cable with the contacts facing upwards into the black bracket and carefully clamp the bracket back in place. 

Also put the tube back on the brass tube. Then screw the laser head to the mounting bracket in the Mr Beam.

In some cases, you may need to do a camera calibration after cleaning if the laser is not in the exact same position as before. So if you have a bigger offset than usual, you can find the camera calibration tutorial here.