Need Help Grainy Texture on Roland LG-300 UV Prints – Need Expert Insights

[siphon56]

Hey everyone!

I have two UV-printed samples labeled as:

• Image A: Printed on another UV printer.
• Image B: Printed on my Roland LG-300.

️ Observations:​

1️⃣ Image A (Other Printer):

• Smooth, clean finish.
• No visible black grains or speckles.

2️⃣ Image B (My Roland LG-300):

• Noticeable black dots or grains appear in soft, muted, or pale tones (see red circles).

⚙️ My Setup So Far:​

• Printer Model: Roland LG-300
• RIP Software: VersaWorks
• Material: 3M IJ 40C

What could be causing these black grainy dots in soft, muted, or pale tones (Image B)?
Are there any specific RIP settings, UV curing adjustments, or substrate factors I might have missed?

Any insights, suggestions, or shared experiences would be hugely appreciated!
Thank you so much for your help!

 

[SGC]

Post your nozzle test.

Also retry this on unidirectional (in versaworks) to verify if this isn’t a bidirectional issue.

How old is the machine?

 

[dreko]

make sure you are printing at the highest resolution Versaworks or your rip allows. (This will typically be the slowest print speed)

 

[Brian Tickenoff]

Is it the same image? Looks a little different.
Also, how many colors? If your printer is 4/c (no LM/LC, etc), you will defiantly see more grain in the highlights.
If you ARE running a model with LM/LC, your profile may have it's black start set too early. Redo your profile with black starting at 20% or so. Play around and see what works best for you.
What res are you running? What res is the other printer?

 

[siphon56]

Post your nozzle test.

Also retry this on unidirectional (in versaworks) to verify if this isn’t a bidirectional issue.

How old is the machine?

I did and they are all good.

 

[siphon56]

I

make sure you are printing at the highest resolution Versaworks or your rip allows. (This will typically be the slowest print speed)

Even printing at the highest settings, still the issue persist.

 

[siphon56]

Is it the same image? Looks a little different.
Also, how many colors? If your printer is 4/c (no LM/LC, etc), you will defiantly see more grain in the highlights.
If you ARE running a model with LM/LC, your profile may have it's black start set too early. Redo your profile with black starting at 20% or so. Play around and see what works best for you.
What res are you running? What res is the other printer?

Can you explain me a bit more further about those LM/LC thingy? And I am sorry if I sound like a stupid, I am really new to this industry, i have a decal business. No the images are different. My printer has CMYKReO+Gloss+(Cleaning Solution instead of white ink as we only print on white vinyl). Here’s what I do to prepare my files. I work in Illustrator I create vector images with the heccode colors and export it as pdf at highest settings. The other printer is using (CMYK+GG+Cleaning solution x2)

 

[siphon56]

Is it the same image? Looks a little different.
Also, how many colors? If your printer is 4/c (no LM/LC, etc), you will defiantly see more grain in the highlights.
If you ARE running a model with LM/LC, your profile may have it's black start set too early. Redo your profile with black starting at 20% or so. Play around and see what works best for you.
What res are you running? What res is the other printer?

I use the top ones in this list,

 

[dreko]

You aren't using the highest resolution. Select the 1440x1440 setting
That's the resolution (assuming you are using the highlighted blue selection of 720 x 1440 dpi)