Prusa ResearchOpen-frame FDM printer

Original Prusa MK4S

Not the fastest, but a printer you can keep and upgrade for years.

Best for: Small workshops, schools and tinkerers

Typical price $1,099

Check price at Amazon

By BuildNReview. Updated October 20, 2026.

This is a sample review used to build the layout. Scores, specs and text are unverified; replace them with real testing before publishing.

What we like

  • Open hardware and firmware
  • Excellent support and repair guides
  • Consistent, accurate prints

What we don’t

  • Expensive for the spec sheet
  • Open frame, needs an enclosure for ABS

Verdict

The MK4S suits people who value reliability, open software and repairability over raw speed.

Reliability

A load cell in the print head probes the bed accurately everywhere, so first layers are almost always right.

Maintenance

Every part has a detailed replacement guide. That is a real difference from budget printers.

Should you buy it?

If the printer earns you money and needs to keep running, the MK4S is worth the price.