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... and just plain down dirty / loose toner in the paper path somewhere but I would lean toward PGM554's solution first to resolve the line issue.<br />
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I'm adding this because of the &quot;dusty look&quot; on the top right side of the paper.
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As you've replaced the cartridge/drum, the only other possible culprit is the fuser. It is a consumable. Usually the fuser is rated at about 100,000 pages. It is normally sold as part of the <a href="https://www.amazon.com/HP-CE525-67901-Maintenance-kit-separation/dp/B009UOHTP6?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-d-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B009UOHTP6" rel="ugc">maintenance kit</a>, which also includes paper pick-up rollers, transfer roller and other items. <br />
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If it has done significantly less than its rated life, HP may replace it under warranty.
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i would start by cleaning the whole printer - could simply be toner everywhere on the right side
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We have a HP LaserJet P3015 that has a printing defect. Attached is what the sheet looks like. It occurs on every print job. We have replaced the ink cartridge, toner, and drum. Any thoughts on what is causing the issue?<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/05_w18/1309311/2018_05_04_11_06_48.pdf" target="_blank" class="file-inline" title="This is a sample of the recurring defect. (117 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>2018_05_04_11_06_48.pdf</a>
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This is a sample of the recurring defect.

2018_05_04_11_06_48.pdf

We have a HP LaserJet P3015 that has a printing defect. Attached is what the sheet looks like. It occurs on every print job. We have replaced the ink cartridge, toner, and drum. Any thoughts on what is causing the issue?

... and just plain down dirty / loose toner in the paper path somewhere but I would lean toward PGM554&#39;s solution first to resolve the line issue.

I&#39;m adding this because of the &quot;dusty look&quot; on the top right side of the paper.

As you&#39;ve replaced the cartridge/drum, the only other possible culprit is the fuser. It is a consumable. Usually the fuser is rated at about 100,000 pages. It is normally sold as part of the maintenance kit (https://www.amazon.com/HP-CE525-67901-Maintenance-kit-separation/dp/B009UOHTP6?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&amp;tag=duckduckgo-d-20&amp;linkCode=xm2&amp;camp=2025&amp;creative=165953&amp;creativeASIN=B009UOHTP6), which also includes paper pick-up rollers, transfer roller and other items. 

If it has done significantly less than its rated life, HP may replace it under warranty.

i would start by cleaning the whole printer - could simply be toner everywhere on the right side

HP Recurring Defect

A printer is a peripheral which makes a persistent human readable representation of graphics or text on paper or similar physical media. Traditional printers are being used more for special purposes, like printing photographs or artwork, and are no longer a must-have peripheral; 3D printing has become an area of intense interest, allowing the creation of physical objects. An image scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications.