Does It Make Sense To Upgrade A Prusa MK4S To A Core One?

Upgrading a 3D printer is a little like “upgrading” a perfectly good sandwich: sometimes you’re adding bacon,
sometimes you’re just making it harder to eat. If you own a Prusa MK4S, you already have a printer that’s known for
reliability, great first layers, and the kind of “it just works” vibe that keeps you printing instead of
doomscrolling troubleshooting forums at 2 a.m.

But then the Prusa CORE One (and now CORE One+) shows up with a fully enclosed CoreXY design, active chamber
temperature control, and a conversion kit that can turn your MK4S into a different class of machine.
So… is it a smart move, or an expensive way to feel productive for a weekend?

Let’s break it down with real-world reasoning, clear cost math, and a few lovingly sarcastic reminders that yes,
you still need to clean your build plate.

MK4S vs. CORE One: What Actually Changes?

The MK4S in plain English

The Prusa MK4S is a premium “bed-slinger” (the bed moves forward/back while the toolhead moves in X/Z). This design
is simple, easy to access, and great for PLA/PETG printing, prototypes, functional parts, and everyday projects.
It’s also portable compared to enclosed machinesgrab it, move it, keep printing.

The MK4S already includes modern quality-of-life features: automatic bed leveling, strong sensor support, tuned
profiles, and a workflow that’s beginner-friendly without being “toy-like.” If your life is mostly PLA, PETG, and
occasional TPU, it’s hard to call the MK4S “lacking.”

The CORE One / CORE One+ in plain English

The CORE One switches to CoreXY motion, where belts drive the toolhead in X/Y while the bed stays mostly put.
In practice, that tends to mean better stability at speed, less vibration showing up in your walls, and fewer
compromises when you want to print faster without turning every curved surface into a tiny topographic map.

The bigger “why” for most people, though, is the enclosure and active chamber control. The CORE One line is designed
to run enclosed with more materialsthink ASA, PC blends, nylonwhile also handling low-temp materials (like PLA)
without overheating everything into a clog festival.

What You Get When You Upgrade: The Conversion Kit Reality Check

Prusa sells a dedicated MK4S → CORE One+ conversion kit that includes the parts needed to transform the MK4S into
the enclosed CoreXY machine. It’s not a “bolt on two panels and call it a day” situation; it’s a real conversion.

Key details you should know before you get emotionally attached

• Compatibility is strict: the direct conversion kit is for the MK4S (not older models unless you upgrade first).
• Power supply matters: some MK4S units with a silver PSU require extra replacement parts before upgrading.
• Reuse is a perk: you can typically reuse multiple MK4S parts (print sheets, hotends/nozzles, and other components).
• Time is a cost: expect a real build processthink “Saturday project,” not “coffee break.”

Translation: this upgrade makes the most sense if you enjoy building kits (or at least tolerate them) and you like
the idea of converting your existing investment rather than starting from scratch.

Reasons the Upgrade Does Make Sense

1) You want to print engineering materials without drama

If you’ve ever tried to print ASA or nylon in a drafty room and watched corners lift like they’re trying to escape
the build plate, you already understand the value of a controlled environment. An enclosed printer with chamber
control helps reduce warping, improves layer adhesion, and can make “advanced filaments” feel less like a chemistry
experiment and more like… printing.

For users doing functional parts, automotive-ish components, jigs, fixtures, and shop tooling, the enclosure is not
a luxuryit’s a reliability multiplier.

2) You care about speed and surface quality

The MK4S is fast for a bed-slinger, but CoreXY designs generally handle higher acceleration more gracefully because
the bed isn’t being whipped back and forth with your part riding on it like a carnival attraction.
That can translate into better results at higher speeds, especially on tall parts or anything with sharp corners.

If you’re printing batches, running a small side hustle, or you simply hate waiting, the CORE One platform can be a
meaningful step upespecially when “faster” also means “not uglier.”

3) You want an enclosure, but you want it integrated (not gigantic)

Putting an MK4S in an enclosure works, but it can turn your setup into a piece of furniture. The CORE One design
aims to be compact and purpose-built. For apartments, classrooms, shared offices, or small workshops, footprint
isn’t a minor detailit’s the difference between “I can keep printing” and “I guess the printer lives in the
closet now.”

4) You like upgrade paths and future-proofing

Prusa’s whole philosophy is “buy once, keep upgrading.” The CORE One+ ecosystem leans into that with platform
updates and planned expansions (including multi-material/tool-changing directions). If you like the idea of your
printer evolving instead of getting replaced, upgrading can feel like a smart continuation of that strategy.

Reasons the Upgrade Might Not Make Sense

1) Your MK4S already does everything you need

This is the boring answer, which is usually the correct answer.
If you mostly print PLA/PETG, love easy access for maintenance, and your success rate is already high, the upgrade
may not change your day-to-day life enough to justify the cost and downtime.

2) You don’t actually need an enclosure (you just want one)

Wanting an enclosure is valid. Wanting an enclosure because you saw a cool Instagram reel is also valid.
But if you’re not printing warpy materials and you’re not constrained by space or noise, an enclosure can be more
“nice-to-have” than “game-changer.”

3) The conversion has hidden friction

Any major rebuild introduces risk: misplaced fasteners, cable routing mistakes, a sensor that needs re-seating,
a “why is it making that noise” moment. Prusa instructions are generally excellent, but converting a machine is
still converting a machine.

Also, if your MK4S requires extra power-supply-related parts to become upgrade-ready, your “upgrade cost” can creep
upward fast. And cost creep is the natural predator of “this seemed like a good idea at checkout.”

4) You could be better served by buying a new machine

If you want a CORE One-class printer but also want to keep your MK4S (backup printer, second material, parallel
production), converting might be the wrong move. In that case, buying a second machine can increase throughput and
reduce downtime risk.

The Cost Math: Upgrade vs. Buy New

The right decision often comes down to one question:
Are you paying for capability, or paying for novelty?

Typical scenarios

• Upgrade route: You buy the MK4S → CORE One+ conversion kit, invest build time, and end up with
  a CoreXY enclosed platform without owning two printers.
• New printer route: You buy a CORE One/CORE One+ (kit or assembled), keep the MK4S intact, and
  potentially resell one later if you don’t need both.

Here’s the sneaky part: “upgrade vs. new” isn’t just dollars. It’s also downtime.
If the MK4S is your only printer and you rely on it weekly, converting it is like remodeling your kitchen when
you only own one frying pan. You can do it, but you’ll eat a lot of weird meals in the meantime.

A practical way to decide

1. Add up true upgrade cost: kit + any required PSU-related parts + your time.
2. Compare to “new machine” pricing: kit vs assembled, plus shipping/tax realities.
3. Estimate resale value: what could you realistically sell the MK4S for if you bought new instead of converting?
4. Value the second printer: two printers often beats one “better” printer if you print a lot.

Decision Cheat Sheet: Who Should Upgrade?

How to Make the Upgrade Less Painful (and More Successful)

Do these before you start

• Confirm your PSU type and upgrade prerequisites. Don’t discover incompatibility mid-build.
• Print a few known-good test models on your MK4S and save the G-code notes. You’ll want comparison baselines.
• Clear a real workspace and label containers. Tiny screws love carpet like it’s a lifestyle choice.
• Take photos during disassembly. Your future self will thank you.

After the conversion

• Run calibration patiently (and don’t skip steps because you’re “pretty sure it’s fine”).
• Start with simple materials (PLA/PETG) to validate mechanics before jumping to nylon.
• Dial airflow and enclosure habits: enclosed printing changes cooling behavior and can affect bridging and overhangs.

Alternatives If You’re On the Fence

If you like the idea of upgrading but you’re not sure you need the full conversion, consider stepping stones:

• Enclosure-first approach: If your goal is primarily temperature stability or fume control,
  an enclosure for the MK4S may deliver enough benefit for less disruption.
• Material workflow upgrades: Dry boxes, better filament storage, and dialing profiles often improve results
  more than people expectespecially for hygroscopic materials.
• Buy new, keep MK4S: If you print a lot, two printers can beat one upgraded printer for throughput and sanity.

So… Does It Make Sense?

Upgrading a Prusa MK4S to a CORE One-class machine makes the most sense when you have a clear reason:
advanced materials, space efficiency, enclosure needs, or a speed/stability boost that impacts your output.

If you’re already thrilled with your MK4S and your filament diet is mostly PLA/PETG, the upgrade can feel like paying
a lot for “nicer,” not necessarily “different.” And “nicer” is wonderfuljust make sure you’re not buying it as a
substitute for cleaning your nozzle and washing your print sheet.

The best upgrade is the one that solves a problem you actually have. The second best upgrade is the one that doesn’t
create three new problems and a mysterious extra screw.

Experiences From the Field: What the Upgrade Feels Like in Real Life (Extra)

Below are common, real-world-style experiences makers report when moving from a Prusa MK4S workflow to a CORE One
workflow (including conversions). Think of these as “composite stories” from the kinds of users who post updates
after the honeymoon period, when the printer is no longer new and shiny and you’ve stopped naming it.

Experience #1: The “My Apartment Is Not a Warehouse” Maker

This person loves their MK4S, but the moment they add an enclosure, their desk starts looking like it’s auditioning
for a reality show called Hoarders: Filament Edition. The conversion feels like a reset. The integrated
enclosure is cleaner, the footprint is easier to live with, and the setup feels more “appliance-like.”
The biggest surprise? Maintenance is different, not worse. You lose some open-frame accessibility, but you gain a
more organized machine that feels less like a science fair project in the corner of your room.

Their favorite change is consistency. Drafts stop being a factor. The printer becomes quieter in the way that
mattersfewer harsh “bed slinger” movement vibes, more steady hum. They print at night without feeling like they’re
running a tiny trampoline in the next room. And because the enclosure is designed for it, they don’t have to do
the “door open / door closed” dance just to keep PLA happy.

Experience #2: The “ASA Is My Love Language” Functional Parts Person

This user doesn’t upgrade for vibesthey upgrade because they’re tired of failed corners, split layers, and parts
that warp like a potato chip with ambition. On the MK4S, ASA and nylon prints are possible, but they often require
extra rituals: enclosure hacks, draft shields, very deliberate cooling choices, and a willingness to restart prints.

After switching to a CORE One setup, the success rate improves noticeably. They can run engineering filaments more
often without babysitting. That doesn’t mean “perfect forever,” because humidity and filament condition still exist
in this universe, but the baseline gets easier. They also start using more ambitious geometries because dimensional
consistency improves when the environment is stable.

Experience #3: The “I Print Batches, Not Dreams” Small Production User

This person prints the same parts repeatedly. They care about repeatability, uptime, and predictable throughput.
The upgrade is judged by one metric: how often do they reprint because something failed?

The conversion tends to pay off when combined with process discipline: consistent filament storage, known-good
profiles, and a basic preventive maintenance schedule (think: check belts, keep things clean, don’t ignore odd
noises like they’re going to resolve themselves through positive vibes). Speed increases are nice, but the real win
is fewer prints that look “almost perfect,” because “almost perfect” still gets rejected by customers.

Experience #4: The Weekend Tinkerer Who Upgrades for Fun (and That’s Okay)

Let’s be honest: some people upgrade because building is half the hobby. For them, the conversion kit is a great
project. They enjoy the teardown, the rebuild, the “I understand this machine now” moment. They also tend to end up
with a printer they trust more because they’ve physically touched every part of it.

The downside for this group is the “upgrade spiral.” Once you’ve rebuilt the printer, it becomes psychologically
easier to add “just one more improvement.” A camera. A dry box. A new hotend. A different nozzle. A custom tool
organizer printed in neon green because you want the printer to look like it drinks energy drinks.
The best advice they share is simple: do the conversion, get it printing reliably, then wait a week before adding
extras. Let the machine stabilize. Let your brain stabilize. Then decide what actually matters.

What nearly everyone learns after the upgrade

• Enclosed printing changes cooling logic: you may tweak fan behavior and vent habits by material.
• Material handling still matters: enclosure doesn’t fix wet filament (nothing does, except drying).
• Workflow improves when you commit: the upgrade shines when you build a consistent routine around it.
• The MK4S remains a great printer: many upgraders still say that if you don’t need the enclosure, you’re not “missing out.”

In other words: the CORE One conversion can be a genuinely practical upgrade, but it’s best when it’s driven by
requirements, not by FOMO. The moment you can explain your “why” without using the phrase “it looks cool,” you’re
probably ready.