Why Are My UV Prints Blotchy? Here's the Simple Fix

If you have been pulling UV prints off your printer and noticing they're look blotchy, patchy, or just kind of uneven, I have really good news.

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The fix is SO simple it is almost silly, and it is probably something you never thought to try, because honestly, why would you?

I figured this out the hard way, so let me save you the frustration.

The blotchy print mystery

I recently printed a batch of magnets. Same design, same surface, same blanks - these are the ceramic magnets that came with my EufyMake E1 UV printer.

But when I looked at them side by side, one magnet looked noticeably worse than the other three. Blotchy areas and uneven color. It almost looked like water droplets had pooled and then dried on the magnet.

The one difference: a white base layer

The only thing I did differently is on three of the magnets, I laid down one single layer of white ink first, underneath the design. On the blotchy one, I did not.

So the Ink Mode for the three good quality UV prints was White > CYMK.

The one that was blotchy was just CYMK....because why would you need a layer of white ink on a white surface...

Why a white layer fixes blotchy prints

Think of that white layer like a primer. It seems to create an even base layer for the colored ink to sit on top of. It gives your colors a consistent, even surface to sit on top of.

This is even more important on porous surfaces like ceramic, wood, or slate where the ink can be absorbed unevenly. The white ink kind of blocks that and acts as an even base layer.

How many white layers do you need?

I tested no white layer against 1 layer of white and then 2 layers of white. What I found is one layer of white is MUCH better than no white, but two will dramatically improve your UV print quality.

If you are printing on something darker, you may need two or maybe three layers to get a solid, even base and block out the color of the substrate.

If you find yourself needing to print more than three layers of white just to get coverage - there's some other issue going on. It's a sign of a white ink problem. First though you should test do a test print to see if your white ink is actually printing - you'd be surprised how many people don't realize it's not working especially on the EufyMake E1 when coming out of maintenance mode. Head over to this post on white ink troubleshooting to confirm.

This works on any UV printer
One more important thing - this is not just a EufyMake E1 tip. The white base layer principle applies to UV printing across the board to avoid blotchy prints.
Whether you are running an EufyMake, an xTool O1 Omni UV Printer an Epson, a Procolored, or any other UV printer, laying down that white base is one of the easiest ways to instantly improve your print quality.
New to all of this? Start with my beginner's guide to UV printing and then come back to this tip.

Want to see it in action?

I show the close-up magnet comparison in my latest video so you can see the blotchy print versus the clean one with your own eyes. Click below to watch.

And if you want to grab the printer I am using, you can shop the EufyMake E1 UV printer here.

Need more help with your UV printer?

If you want personalized, same-day help with your UV printer - or any machine you see here on my channel - I offer all of that inside Silhouette U.

You get access to the full site, a private community, and direct support. Join over at Silhouette U.

Note: This post may contain affiliate links. By clicking on them and purchasing products through my links, I receive a small commission. That's what helps fund Silhouette School so I can keep buying new Silhouette-related products to show you how to get the most out of your machine!

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