Voron 2.4 vs Bambu Lab P1S: Build It or Buy It?

Almost everyone who reaches a Voron 2.4 build page has the same question in the back of their mind: why not just buy a Bambu Lab P1S and start printing this weekend? It is a fair question, and the honest answer is that these two machines are not really competing on print quality. They are competing on what you want to own.

The short version. Buy the P1S if the printer is a tool and the parts are the point. Build the 2.4 if the printer is the point, if you need a 350 mm enclosed volume, or if you want a machine whose every part is documented, replaceable and modifiable. Neither answer is wrong, and picking the one that does not match your temperament is how printers end up on marketplace listings six months later.

Specifications side by side

Voron figures are from Voron’s own design documentation; P1S figures are from Bambu Lab’s published specification for the machine.

	Voron 2.4	Bambu Lab P1S
Kinematics	CoreXY, flying gantry on four belted Z motors	CoreXY, fixed gantry, moving bed in Z
Build volume	250 x 250 x 220 mm up to 350 x 350 x 330 mm	256 x 256 x 256 mm
Enclosure	Enclosed by design, panels part of the build	Sealed enclosure with chamber regulator fan and carbon filter
Hotend	Builder’s choice	All-metal, 300 C maximum
Bed	Builder’s choice; AC bed and SSR common	100 C maximum, textured PEI plate
Max toolhead speed	Set by your configuration and tuning	500 mm/s
Max acceleration	Set by your configuration and tuning	20 m/s² (20,000 mm/s²)
Flow ceiling	Set by the hotend you fit	32 mm³/s stated for ABS at 280 C
Firmware	Klipper, fully open and editable	Bambu firmware, closed
Multi-material	Whatever you build or add	Optional AMS, sold separately
Physical size	Depends on frame size chosen	389 x 389 x 458 mm, 12.95 kg
Time to first print	Weeks	Same day

Two rows carry most of the decision. Build volume: the P1S is a 256 mm cube, which is more Z than a 250 mm Voron 2.4 and considerably less bed than a 350. If you print tall, wide parts, the 350 Voron has no equivalent in that price class. Firmware: everything else on this page follows from open Klipper versus a closed stack.

What the P1S genuinely does better

It works immediately, and it keeps working. The value of a machine assembled, tuned and warrantied by its manufacturer is easy to dismiss until you have spent an evening chasing a wiring fault. The P1S arrives calibrated, runs its own flow and resonance routines, and if the hardware fails there is a company to talk to.

Closed-loop cooling and filtration. Bambu lists closed-loop control on the part cooling fan, hotend fan, control board fan, chamber temperature regulator fan and auxiliary part cooling fan, plus an activated carbon filter. On a Voron you assemble the equivalent yourself and you decide what filtration, if any, you want.

Multi-material is a purchase, not a project. The AMS is an optional add-on that works with the machine as sold. The Voron equivalents exist and are good, but they are a second project.

Predictable results across a wide material list. Bambu rates PLA, PETG, TPU, ABS, ASA, PVA and PET as ideal on the P1S, PA and PC as capable, and carbon or glass fibre reinforced polymers as not recommended with the stock stainless nozzle. That last line matters: abrasive filaments need a hardened nozzle on any machine, and the P1S ships without one.

Resale. A working, current-generation consumer printer sells easily. A used self-sourced Voron is a much harder sell because the buyer is inheriting somebody else’s build decisions.

What the Voron 2.4 genuinely does better

Volume, if you need it. The 2.4 scales to a 350 x 350 x 330 mm enclosed envelope, and the bed does not move, so a tall heavy print is not riding a shuttling platform.

Repairability with no gatekeeper. Every part is on a published bill of materials. A cracked printed part is a reprint. A dead stepper driver is a standard part. Nothing depends on a vendor still stocking a proprietary assembly in three years.

Firmware you own. Klipper exposes the whole motion stack: per-axis input shaper types and frequencies, pressure advance per filament, custom macros, QUAD_GANTRY_LEVEL, arbitrary sensors, host-side scripting. Klipper’s resonance compensation lets you choose the shaper and the acceleration limit yourself rather than accept a vendor’s default, and the input shaping walkthrough covers exactly how that is measured.

Chamber behaviour on your terms. Voron’s documentation notes that chamber temperatures inside an enclosed Voron commonly reach 55 to 60 C, which is why the printed parts must be ABS, ASA or another material with a glass transition temperature of at least 80 C. That same requirement is a hint about the machine’s intent: it is designed around a hot chamber for engineering plastics, and you control the insulation, panel material and any active heater.

An upgrade path that never dead-ends. New toolhead, CAN board, different hotend, larger frame later. The design assumes you will change it.

The cost comparison nobody puts on the box

Comparing a kit price against a printer price is the wrong arithmetic. The Voron total is:

• the kit or self-sourced bill of materials,
• printed parts, which Voron’s sourcing FAQ puts at 1.6 kg of primary colour plus 0.3 kg of accent for a V2 assuming nothing is reprinted, so budget more,
• an existing printer capable of printing ABS or ASA well, or the cost of buying that set of parts from someone who has one,
• consumables and tools that do not appear in any BOM,
• and your time.

Voron publishes per-model pricing estimates on its hardware page and states plainly that those estimates exclude tools and common building supplies, and that costs vary widely with sourcing and shipping. Treat any single quoted Voron figure with suspicion; it is a range, not a price.

The time cost is the one people underestimate. Voron ships an assembly manual per model, not a quick-start card, and the printed-part set alone is days of printing before assembly begins. If you do not currently own a printer that can produce ABS parts reliably, the honest first step toward a Voron is often buying a P1S, using it to print the Voron parts, and keeping it afterwards as the machine you reach for when you just need a part.

Which one, concretely

Buy the P1S if you want parts rather than a project; you print PLA, PETG and the occasional ABS part; you want multi-colour without engineering it; 256 mm cubed is enough; or you have no printer at all and need one before you can build anything.

Build the 2.4 if you want a 300 or 350 mm enclosed volume; you already own a printer that handles ABS; you want firmware you can read and change; you intend to keep modifying the machine; or the assembly is a thing you actively want to do rather than a toll you are paying.

Consider a Trident instead if you want a full-size self-built Voron without the hardest assembly step. It uses three lead-screw Z motors and a fixed gantry rather than a flying one, which removes gantry squaring from the build. The model-by-model comparison puts the four Voron designs against each other on volume, motor count and difficulty.

If you land on the Voron side, the next decision is sourcing, and it is the one where money is most easily wasted: the Voron kit buying guide lists what to check before you place the order. If you want to see what speeds a given Voron platform and hotend combination can actually sustain before you commit, the Klipper input shaper and CoreXY speed calculator works it out from your machine’s resonance frequencies and flow limit.