From Asmbly Wiki

Pearl is a Royal Mark RSX-1832. It's the same chassis as Blue (it even has ULS badges on the back) but slightly stronger at 100W and has air assist like Red.

Pearl also has a rotary fixture, so you can use it to engrave round things like glassware.

Pearl is online and bookable, but air assist isn't functional at this time (October 2021)

Pearl is so similar to Blue that when Blue went down we're just steering trained Blue users over here with this guide. It cuts faster and cleaner than Blue, too.


Pearl Setup

Turn on chiller, wait for 22C (or whatever is labeled above the display) which will take under 5 min and the chiller will auto-regulate there. The chiller must be on to run the machine. It’s not harmful to start running earlier, but its power is going to increase as temp drops and it will be inconsistent

Turn on the blower, currently with a switch on a power strip. There is no protection against not turning on the blower but that could damage stuff, so don’t. Will make automatic pretty soon

Set the Machine Origin

(this might be due to the coin cell backup not working, it resets when powered down)

If this is not done, the work will be offset or shifted off the bed entirely and the laser may do weird things on the edges.

PXL 20211109 061933365 (1).jpg

#1 Press the X-Y button to enter jog mode

#2 use the arrows to job to the top left of the bed, the LCD should read "POS 0.000x 0.000y" as the second line

PXL 20211109 061947068 (2).jpg

#3 The LCD should have the cursor on "SET NEW ORIGIN", so hit "SELECT", ok the "are you sure?", display should now also read ORG 0x 0y as the first line, as shown above.

Set Z for your stock

Pearl has a powered Z axis, but unlike Blue/Red, it is not controlled by driver settings. You lift or lower it to the correct location for your stock thickness and it will always run your job wherever the Z is. It will never move it automatically by the software.

The Z is moved by panel buttons using the Z height shown on the panel's LCD. However, for some reason the Z height and/or focus keeps being incorrectly calibrated, we don't know why (possible user error), so we are NOT using this method until further notice. You need to use the stick, which many users did anyways.

#4 To move the Z, first press the "Z" button on the right once.

The carriage will jump to a focus location. Place YOUR stock UNDER the carriage. Locate the FOCUS STICK in a hole on the left of the bed under the lid.

Locate the RAMP on the stick, just so you understand. This is the measurement point that will contact the BOTTOM LIP of the FRONT of the carriage at the perfect focal distance. Not the side of the carriage, pics are from the left. The stick's step is sloped so it does not pinch or jam against the carriage if adjusted too high, but just tips away.

Place the focus stick ON TOP OF YOUR STOCK LOADED IN THE BED, against the FRONT of the carriage. This is shown LOW, you need to Z UP.

#5 Use the Z UP/DOWN arrows to move the bed. Again, the "Z position" LCD display keeps getting changed somehow so just don't use it for now. When done, just leave it, you don't need to set anything

This is now too high, the ramp tilts the stick away. Go DOWN.

Pearl Z perfect.jpg

This is perfect. The Z UP/DOWN button deals in 0.1" steps and that's good enough for most apps.

#6 Press the "Z" button on the far right a second time to send the carriage home and return the stick to its hole.

Pearl stick.jpg

The official ULS manual diagram

Printing From Adobe Illustrator

Like all ULS machines, VECTORS must be very thin or they will be reinterpreted as RASTER graphics. ("HAIRLINE" in Corel, or >=0.001 inch thick).

In Illustrator, change to inch units:

Illustrator->Edit->Preferences->Units->Stroke=Inches to enable Inch units

Change all vector lines to 0.001" stroke

When you print in Illustrator:


Orientation: PORTRAIT

Print Layers: ALL LAYERS

Placement: CENTER, right beside that enter X=0 Y=0 (this seems to override the Placement, entering X=0 Y=0 might be what you really need)


If you set this differently, the job may shift a bunch in +/- X or Y, or may disappear off the workspace all together. The Preview window should appear correctly as shown, however if you did not select CENTER for PLACEMENT, it will shift your job when cutting but unfortunately will NOT appear differently on the Preview window.

“THE CATCH” of using Illustrator: every time you go to ULS’ “Setup” to change your power and print or save from there, Illustrator has been seen resetting Orientation back to Landscape, it must be Portrait. So, reselect Portrait and recheck the above entries after visiting the ULS setup window. The Preview window does not seem to update correctly at this point but the laser will get it correctly.

If anyone knows how to keep Illustrator from reverting like this, that would be great.

ULS's Print Driver Menu

When you do hit SETUP, you see the familiar ULS print driver settings, needed to set speed, power, rastering settings, etc

The difference vs Red and Blue is there's no entry for Z, because it just runs wherever you left it after adjusting with the stick. PPI is now relevant, as this laser uses a pulse-mode source. PPI may change the appearance of the cut edge, becoming serrated if very low. Low settings (150PPI) may cut at greater speed than a higher PPI as the pulsing may be more intense peaks.

150 PPI for cutting and maybe 500 for rastering or fast engraving is a good suggested starting point.

Laser Cutter Settings

1/8" plywood 11% speed 150 PPI 0.2" plywood 8% speed 150 PPI


Send job, press START. If you immediately hear TWO BEEPS, your job is EMPTY. Either ORIGIN was not set to 0x 0y (step #1 above), the Orientation is wrong and it shifted all the content off the workspace, or you have VECTOR selected but the LINE WIDTH inside Illustrator, etc WAS NOT SET TO 0.001" WIDTH


The beam flashes with an intense flicker when it hits the honeycomb. Don’t freak out this seems normal

Shutting Down

Turn off. Peal’s power switch, the chiller, the exhaust blower. In any order.

Please remove small debris from the honeycomb and vacuum if necessary


This tool is owned by Danny Miller and hosted at Asmbly for members to use. Please contact the workshop committee if maintenance is required.