Our take
The Samsung SCX-4521F is a monochrome laser MFP whose F suffix is supported by the exact model guide's fax specifications. Samsung's English user guide also documents print, copy and scan functions, 20 ppm Letter output, an automatic document feeder, parallel and USB interfaces. The source does not establish automatic duplex or a recommended monthly range. It is a legacy model, and the checked sources do not map the candidate to a current U.S. electrical configuration. Choose it only when the exact unit and voltage are verified.
A legacy mono fax workflow needing copy and scan functions, provided the exact unit's voltage and condition are independently checked..
Skip it if automatic duplex, modern network sharing, confirmed regional power or a documented workload range is essential.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The model combines printing, copying, scanning and fax in one device.
- An ADF supports multi-page originals without placing every sheet on the glass.
- Parallel and USB interfaces are documented in the exact-model guide.
What to weigh up
- Automatic duplex is not established by the checked source.
- The documentation does not establish built-in Wi-Fi or Ethernet.
- The candidate's regional voltage and recommended monthly range remain unknown.
Specifications and exact model details
The key details
| Model covered | SCX-4521F |
|---|---|
| Main functions | Monochrome laser print/copy/scan/fax multifunction printer |
| Print output | 20 ppm Letter output with an automatic document feeder |
| Two-sided printing | Parallel and USB interfaces; duplex, networking and monthly recommendation unspecified |
Performance figures are manufacturer claims. Source checked October 15, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
A four-function monochrome machine
Samsung identifies the SCX-4521F as a black-and-white laser multifunction printer. The Samsung-authored guide describes printer, copier, scanner and fax functions, which covers office documents beyond printing alone. It does not produce color pages. The model identity matters because related SCX devices may omit fax or use different interfaces. Confirm the F suffix on the machine label and inspect the exact hardware before purchasing a used unit. The [Samsung SCX-4521F support record](https://www.samsungsvc.co.kr/download/view?code=SCX-4521F&prd1DepNm=%ED%94%84%EB%A6%B0%ED%84%B0%2F%EB%B3%B5%ED%95%A9%EA%B8%B0&prd2DepNm=%ED%9D%91%EB%B0%B1%EB%A0%88%EC%9D%B4%EC%A0%80+%EB%B3%B5%ED%95%A9%EA%B8%B0) ties the model name to Samsung's support library.
Fax and scanning for paper workflows
The F model's fax capability is distinct from its scan-to-computer role. Samsung documents fax in the manual and identifies an ADF for originals, so multi-page sending and copying do not require feeding every page by hand. The guide lists a 20 ppm Letter print rate, but that is not a fax speed or a guarantee for mixed print jobs. Check the feeder rollers, fax line connection and scan path on a used unit; the product page cannot confirm that a specific machine still works.
No proven two-sided printing
The checked guide does not establish an automatic duplex unit or a separate manual-duplex mode. Buyers should not infer two-sided output from a generic MFP description. If a job must print both sides, confirm the exact device's feature list before selecting it. This review keeps both duplex values unknown, so the SCX-4521F does not satisfy a hard automatic-duplex requirement. Its documented ADF concerns the handling of original documents and does not mean that printed sheets turn automatically.
Parallel and USB rather than a network promise
Samsung's English guide lists parallel and USB interfaces. Those are useful for a direct computer connection and legacy workstation setups, but the checked source does not establish built-in Ethernet or Wi-Fi. Do not use the historical candidate's presence in a marketplace dataset as evidence that the machine has network features or remains available. If several users need to share a queue, confirm the exact ports and operating-system support first. A network adapter should not be presumed part of the standard unit.
Verify power and workload before relying on it
The saved source check identifies the model family but does not map the candidate to a regional voltage, so the electrical label must be checked on the actual machine. The documentation also does not give a recommended monthly page range. Twenty pages per minute is a speed measurement, not a monthly target. For an office with a known duty pattern, choose a printer with a clear recommendation rather than estimating one from the speed. If using a secondhand unit, review service history and the condition of its ADF, scanner bed and toner system.
Compare for your needs
For shared network printing choose a verified Ethernet or Wi-Fi model; for two-sided pages require sourced automatic duplex.
Find the undefined that fits you.
Tell us what matters. We’ll help you weigh the options.
Before you buy
Does the SCX-4521F include fax?
Yes. Samsung's guide identifies fax capability for the exact F model.
Does it automatically print two-sided pages?
The checked guide does not establish automatic duplex, so the value remains unknown.
Are Ethernet and Wi-Fi documented?
The checked English guide lists parallel and USB interfaces, not built-in Ethernet or Wi-Fi.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Samsung-authored SCX-4521F English user guide ↗ — checked October 15, 2026.
- Samsung exact SCX-4521F support record ↗ — checked October 15, 2026.
- Samsung-authored English guide for functions, speed, ADF and interfaces ↗ — checked October 15, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.