Original Prusa Enclosure Review

The Original Prusa Enclosure makes the most sense if you already own a compatible Prusa and want to print materials that curl or lift off the bed when they cool unevenly. It surrounds your printer with a metal frame and clear panels, keeping drafts away and holding in heat. The printer itself isn’t included.

I’d recommend it for regular ASA printing if you have room for it and prefer a kit with documented installation and accessory options. Its biggest drawbacks are the space it takes up and the access you lose when servicing your printer. If PLA and PETG already print well on your open machine, this is an expensive way to add dust protection. A basic DIY LACK enclosure is the closest cheaper alternative.

Will the enclosure fit your Prusa setup?

Prusa now lists this accessory as the Original Prusa MK4/S Enclosure. It’s the standalone enclosure for the MK-style printers, separate from the XL and MINI enclosures or a complete CORE One printer.

For an MK4 or MK4S, the current assembly manual explicitly confirms compatibility. It also includes MK3.9/S and MK3.5 installation paths. MK3S+ owners get separate instructions for black and silver power supplies. The original MK3 and MK3S belong to the intended MK3/S/+ family, but the detailed current preparation chapters use MK3S+ hardware. If yours is an older or modified machine, confirm the required printed parts and power-supply arrangement with Prusa before ordering.

The power supply, or PSU, deserves particular attention. A silver PSU doesn’t automatically rule out the enclosure: there’s an official silver-PSU installation procedure, although you need to print its retainer. The optional PSU cable quick-release is different. It supports black Delta power supplies only, and the MK3/S/+ and MK4/S versions aren’t interchangeable. Choose it for your actual printer electronics, especially after an upgrade.

Multi-material printing needs more planning. The enclosure has room for the older MMU2S filament-changing unit. For MMU3, Prusa’s installation guide requires the Hinged Lid first, then additional printed parts, spool holders, a filament buffer and guide-tube routing. The buffer manages slack as filament loads and unloads. This is more involved than putting an MMU-equipped printer inside the box.

With one spool, filament can sit inside and travel through a PTFE guide tube to the print head. With MMU3, plan the entire spool-and-buffer arrangement, including the space needed to reach it.

Making room for the Prusa enclosure and assembling it

Measure your bench before you buy. With the screen inside, Prusa specifies 530 mm wide, 640 mm deep and 545 mm high—roughly 21 × 25 × 21.5 inches. Moving the screen outside increases the listed depth to 715 mm, or about 28 inches.

You also need at least 250 mm, roughly 10 inches, in front for the doors to open fully. That’s working space beyond the closed box. Leave room to reach the back and sides, too, and overhead space if you’re adding the Hinged Lid. A shelf that barely fits the enclosure can make maintenance miserable.

The enclosure alone weighs 10.6 kg, about 23 pounds. Its frame, roof and floor are metal; the transparent panels are PETG plastic. Choose a stable bench that can support the enclosure, printer and filament together.

It arrives as a kit with the main enclosure parts, fasteners, printer frame brace and temperature sensor. Handles and optional printed accessories shown in photos aren’t necessarily included. Since the package revision in late May 2024, external display supports must be printed separately. MK4/S owners also need the correct A or B support version for their display.

Installation includes moving the PSU outside, routing its cables and fitting the brace where it supported the printer frame. Gather the tools listed in your printer’s chapter. For MK4/S installation, these include a 2.5 mm Allen key, needle-nose pliers, a PH2 Phillips screwdriver and a knife. Unplug the printer before starting.

Give yourself plenty of time to assemble it. A reported hands-on build with lighting, filtration and fire suppression found the process well explained but time-consuming. There was no timed result, so don’t count on finishing in an hour or two.

What the Prusa enclosure changes for different materials

The useful change is a warmer, steadier printing environment. This is a passive enclosure: heat comes from the printer’s heated bed, with no separate chamber heater or settable chamber temperature. Your room temperature and print settings still affect how warm it gets.

ASA and ABS are the strongest reasons to buy it. These plastics can shrink enough during cooling to pull corners off the bed or split a print. Keeping cold drafts away and retaining warmth can help, particularly when you’re making larger parts. Polycarbonate, polypropylene and some nylon formulations can also benefit, but follow the instructions for the specific filament rather than treating every “advanced” material alike.

One MK4 owner reported that an approximately 100 mm ASA bobbin warped badly without an enclosure, then came out almost perfect inside this one. That’s a useful example of the problem it can solve, but an owner account without matched settings, temperatures or repeated trials doesn’t establish a guaranteed improvement.

PLA needs less trapped heat. In a warm enclosure, filament can soften too early in the print head and cause feeding trouble or a clog. Be prepared to print PLA with the doors open, particularly in a warm room. The included temperature sensor helps you see heat building up, but it doesn’t control it. Don’t treat one owner’s successful chamber temperature as a universal safe limit.

PETG usually gives you less reason to enclose the printer. Prusa’s warping guidance cautions against enclosing both PLA and PETG. If your PETG parts already come out cleanly, buying this enclosure for extra warmth is hard to justify. You might still want its physical barrier and dust protection, while letting heat escape as needed.

For any material, an enclosure won’t correct the wrong bed temperature, a dirty print surface or poor first-layer adhesion. Address those causes of lifting, too. And warmer air around a print doesn’t make its emissions harmless: plan room ventilation separately from the heat you want to retain around the part.

Everyday access, upkeep and noise in the Prusa enclosure

The front doors let you remove prints and reach the bed, but enclosing an open-frame printer inevitably makes some jobs more awkward. Nozzle work may be possible through the front; repairs requiring access from the sides can mean removing panels or taking the printer out.

Owner accounts differ partly because the printers and modifications differ. An MK3S+ owner described restricted side access, while an owner who moved to an MK4 found work around the heated nozzle assembly easier and also used a modified top opening. You shouldn’t expect that modified access from the base enclosure. The official Hinged Lid adds top access, but the side panels still aren’t doors.

Keeping the screen inside saves depth. Moving it outside lets you use the controls without opening the enclosure, at the cost of printing the mounts and following the external-display installation guide. Think about how often you change filament or reach into the machine before choosing the arrangement.

Dust protection also doesn’t eliminate cleaning. For the PETG panels, Prusa recommends lukewarm water, mild soap and a soft sponge. Avoid abrasives, acetone and scraping with sharp tools.

Don’t buy this mainly to silence the printer. Some owners describe quieter operation; others report panels resonating with vibration. A hands-on build report found little noticeable noise benefit from its thin walls, without sound-meter measurements or a controlled comparison. Your printer, bench and optional filtration fan all affect what you hear. There’s no measured noise reduction to promise you.

Which Prusa enclosure extras are worth adding?

Start with the job each extra does. The base enclosure provides the surrounding structure and temperature monitoring; it doesn’t include filtration, lighting, a lock, the PSU quick-release or fire suppression.

Filtration is the most relevant addition for regular ASA printing. Prusa’s Advanced Filtration System combines a blower, a HEPA particle filter and activated carbon intended to reduce odors and gaseous pollutants. HEPA catches particles; it doesn’t remove gases by itself. Prusa’s quoted 99.9% filter efficiency isn’t a measurement of everything escaping the assembled enclosure or a guarantee of safe room exposure.

Budget for replacement filters: Prusa estimates at least 600 operating hours. Keep a record of use and follow current replacement guidance rather than waiting for a smell. You still need ventilation. If you frequently print materials that release more particles and gases, prioritize a system that captures emissions near the printer and carries them outdoors. The optional filter circulates air inside the enclosure; it doesn’t vent it outside.

A user comment reports lower chamber temperature and draft-like circulation with filtration running, but it doesn’t show how much cooling to expect or establish a general print-quality problem. Check your chamber temperature and results with the filter running. That report isn’t a reason to turn off the filter.

Lighting and quick-release hardware solve everyday annoyances. The LED strip is useful if shadows make the first layer hard to inspect. The compatible PSU quick-release earns its place if you regularly remove the printer for repairs. Otherwise, the standard design allows removal with the PSU.

The LED and filtration system share the Basic Board and separate accessory PSU. When buying extras individually, include these required parts; the standalone filtration unit doesn’t include them. The enclosure configurator handles the required power supply when you select those options.

The lock is useful for controlling access in a shared workspace. It restricts opening the front doors; it doesn’t make the printer safe to leave unsupervised.

Fire suppression is an additional precaution. BlazeCut responds to heat without needing electrical power. Three laboratory fire trials with an MK3S+ and the 2022 enclosure design found that the enclosure contained flame and heat effects under those test conditions. Two trials used gas suppression. Those results don’t guarantee protection in every fire or establish the performance of later accessory revisions.

For US buyers, Printed Solid lists a revised 45 cm system for the MK4 enclosure, shipping only within the continental US. Prusa’s direct shipping is EU-only. Follow the supplied revision’s installation and inspection instructions, and don’t treat suppression as permission for unattended printing.

Is the Original Prusa Enclosure worth the extra cost?

I’d buy it for a compatible Prusa that will regularly print ASA or other draft-sensitive materials, provided the bench has enough working room. The appeal is a metal enclosure with documented printer installation, mounting points and specific accessory options. Those conveniences matter if you’d rather follow an established build than design the details yourself.

A basic DIY LACK enclosure generally costs less in materials. It uses IKEA tables, clear panels, printed fittings and hardware, so you’ll need to source parts and do more fabrication. Compare equivalent setups: add the lighting, filtration and power-supply arrangements you actually need to both plans. There’s no single meaningful saving once custom extras and your time enter the comparison.

Prusa still requires substantial assembly, so paying more doesn’t buy you a ready-made cabinet. It buys a coordinated kit. An owner who built multiple LACK enclosures preferred the Prusa’s sturdiness, but that preference doesn’t prove a longer service life or better print results than a well-built DIY enclosure.

I’d skip it if you mainly print trouble-free PLA and PETG, need easy access from every side or lack space to open and service it comfortably. I’d also skip it if your main expectation is silence or complete fume removal. Choose it because you need its printing environment and value its installation and accessory system enough to accept the cost and access compromises.