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What Ink Does the Epson WorkForce WF-3720 Use?
What Ink Does the Epson WorkForce WF-3720 Use?
May 23, 2026 —
Correction (October 2026): an earlier version of this guide said the WF-3720 uses Epson 220 / 220XL cartridges. It uses Epson 702 / 702XL. Epson 220 fits printers such as the WF-2630, WF-2650 and X...
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What Ink Does the HP Envy Inspire 7955e Use?
What Ink Does the HP Envy Inspire 7955e Use?
May 21, 2026 —
Correction (October 2026): an earlier version of this guide said the ENVY Inspire 7920e and 7220e take HP 64. Those are European models that take HP 303. It also said compatible cartridges work nor...
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Why Is My Printer Ink Smudging? Eight Causes and How to Stop It
Why Is My Printer Ink Smudging? Eight Causes and How to Stop It
June 4, 2026 —
Smudging is one of those printer problems that looks small on the page and turns out to have half a dozen possible causes underneath. If your inkjet is leaving streaks, smears, or wet-looking patch...
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What Toner Does the HP LaserJet Pro 4001dn Use?
What Toner Does the HP LaserJet Pro 4001dn Use?
May 23, 2026 —
The HP LaserJet Pro 4001dn is a monochrome laser printer that uses the HP 148A (W1480A) toner cartridge. The cartridge has an integrated drum, so there is no separate drum unit to replace.HP 148A a...
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What Ink Does the HP Envy 5640 Use?
What Ink Does the HP Envy 5640 Use?
May 23, 2026 —
Quick answer: The HP Envy 5640 uses two cartridges: HP 62 black and HP 62 tri-color, or the high-yield HP 62XL versions (about 600 black and 415 color pages). Castle Ink's remanufactured 62XL black...
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What Toner Does the Brother DCP-7030 Use?
What Toner Does the Brother DCP-7030 Use?
May 23, 2026 —
Correction (October 2026): an earlier version of this guide listed the TN-360 as the standard cartridge and said the drum lasts about three toners. The TN-360 is the high-yield cartridge, the stand...
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What Ink Does the HP ENVY 6165e Use?
What Ink Does the HP ENVY 6165e Use?
September 15, 2026 —
Correction (October 2026): an earlier version of this guide said compatible cartridges work normally if you skipped HP+. They don't always: the 6165e uses HP dynamic security, which can block cartr...
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What Ink Does the HP Envy 5660 Use?
What Ink Does the HP Envy 5660 Use?
May 20, 2026 —
Quick answer: The HP Envy 5660 uses HP 62 Black and HP 62 Tri-color ink cartridges. The HP 62XL high-yield cartridges print about three times as many black pages (600 vs 200) and about two and a ha...
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How to Print on Post-it Notes (Sticky Notes) With Any Printer
How to Print on Post-it Notes (Sticky Notes) With Any Printer
September 30, 2026 —
Published September 30, 2026. Written by William Elward, founder of Castle Ink.
Quick answer
To print on Post-it notes: (1) make a letter-size template with six 3 x 3 inch boxes in Word or Google D...
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May 23, 2026 — Correction (October 2026): an earlier version of this guide said the WF-3720 uses Epson 220 / 220XL cartridges. It uses Epson 702 / 702XL. Epson 220 fits printers such as the WF-2630, WF-2650 and X...