Direct answer: do not buy the QIDI Plus4 as though it were a current-production alternative to the Bambu Lab P1S. QIDI now says the Plus4 is discontinued and names Plus5 as its direct successor. Choose a P1S only when the exact regional offer, warranty, return terms and complete delivered price beat the current P2S path. Consider a used or remaining-stock Plus4 only when its 305 x 305 x 280 mm envelope or listed 65 C active chamber solves a recurring job and the seller can document condition, support and parts.
Recommendation: compare three real transactions, not two old spec sheets: the exact P1S offer, the exact Plus4 unit, and the current alternative on the same side of the decision—P2S for Bambu or Plus5 for QIDI. If the Plus4 is not substantially cheaper after inspection, shipping, wear parts and return risk, skip it. If the P1S does not retain a clear all-in advantage over P2S, choose the current Bambu branch.
| Decision | Bambu P1S | QIDI Plus4 | Buying rule |
|---|---|---|---|
| Current status | Official US product page remains live; verify the exact variant at checkout | QIDI says discontinued and no longer in production | Treat Plus4 as used or remaining stock, not a normal current-model purchase. |
| Listed build volume | 256 x 256 x 256 mm | 305 x 305 x 280 mm | Plus4 adds 49 mm in X/Y and 24 mm in Z; prove the gain with supported sliced jobs. |
| Chamber and material path | Enclosed without active chamber heat; current page lists a 0.4 mm stainless-steel nozzle | Product page lists second-generation 65 C active chamber heating | Match the exact filament, nozzle, feed path, dryer, build surface and accepted part. Chamber temperature alone is not compatibility. |
| Filled-filament hardware | Bambu says CF/GF and other hard-particle filaments require a hardened-steel nozzle replacement | Inspect the exact installed hotend, nozzle and feed hardware on any used or remaining unit | Price required wear hardware before calling either machine engineering-material ready. |
| Current successor check | P2S keeps the 256 mm cube and lists hardened-steel nozzle and extruder gear | QIDI calls Plus5 the direct successor and lists 320 x 320 x 300 mm, 370 C nozzle and 65 C chamber heat | A discontinued model should win on measured fit and risk-adjusted price, not nostalgia or headline specifications. |
| Transaction proof | Confirm regional stock, package, delivery, warranty, return window and replacement parts | Require serial, cold-start video, heat and motion checks, first-layer sample, service history, included parts and a return path | Use total condition-adjusted cost, not the seller's headline number. |
Use the P1S dimensions guide for near-limit parts. Compare P2S versus P1S before choosing the older Bambu on familiarity alone. If the 305 mm heated-chamber branch is still the requirement, use P2S versus Plus4 only as a workflow reference, then recheck actual Plus4 condition and availability. The P1S worth-it guide and Plus4 alternatives guide cover the two route-out decisions.
Sources checked September 12, 2026: Bambu Lab's official P1S and P2S pages, plus QIDI's official Plus4 lifecycle notice and Plus5 successor page. This is manufacturer-documented buyer analysis, not hands-on testing. GoodPrints may earn a commission from qualifying links.
Affiliate disclosure: GoodPrints3D may earn a commission from qualifying Amazon purchases. Recommendations are based on buyer and workflow fit; specifications, price, and availability can change.
Use the P1S review or QIDI Plus4 review for the ownership details. If the P1S feels dated but the Plus4 still looks too specialized, compare the P2S with the Plus4. If the shortlist is still wider, start with the 3D-printer chooser.
Who each printer is for
Bambu Lab P1S
- buyers who want the easiest serious enclosed recommendation without climbing into a more specialized branch
- small shops, home workshops, and side-business owners printing a mix of everyday functional parts
- people who want to start in the broad enclosed lane and only move up later if their part size, materials, or production needs clearly demand it
- readers who may also be deciding through pages like P2S vs P1S, Who Should Buy the Bambu Lab P1S?, or Is the Bambu Lab P1S Still Worth It in 2026?
QIDI Plus4
- buyers who already know they are shopping for more enclosed room and a more committed heated-chamber path
- owners whose parts or material plans keep pushing beyond the mainstream enclosed comfort zone
- people comparing larger enclosed options like QIDI Plus4 vs QIDI X-Max 3 or cross-shopping against other stronger step-up machines such as Prusa CORE One vs QIDI Plus4
- readers who need a machine that can make the larger heated-chamber branch feel justified often, not just occasionally
Where the P1S wins
It is the safer recommendation for more buyers
The P1S wins because most enclosed-functional-printing buyers do not actually need the Plus4 lane. They need a machine that is easier to buy, easier to place in a small shop or home workspace, and easier to recommend without attaching a long list of caveats about build-volume economics or hotter-material plans.
It makes more sense when your work is broad rather than specialized
If your week includes jigs, brackets, prototypes, organizers, fixtures, and everyday PETG or PLA parts, the P1S usually lands in the better value zone. It keeps you in the mainstream enclosed branch where there is less risk of overbuying for capability you only use occasionally.
It is easier to justify when you care more about clean ownership than about theoretical headroom
Some buyers talk themselves into a larger heated-chamber machine because it sounds more future-proof. But if your current mix of jobs does not keep hitting the limits of the mainstream enclosed lane, the P1S is usually the smarter call.
Where the QIDI Plus4 wins
It gives you a more convincing larger heated-chamber step-up
The Plus4 wins when your work really does need more enclosed room and a stronger case for hotter enclosed materials. If one-piece part size, chamber priority, or a more ambitious engineering-material path is the reason you are shopping, the Plus4 offers something the P1S cannot match by simply being the safer broad-market pick.
It can be the better machine when larger parts are the actual job, not just an occasional nice-to-have
Part size matters a lot in this decision. If you are constantly breaking parts into sections, working around build limits, or planning purchases around larger enclosed output, the Plus4 becomes easier to defend.
It makes more sense when the heated-chamber story is central to the workflow
The Plus4 should not be bought as a vague upgrade. It should be bought because your work repeatedly points toward the larger heated-chamber lane. When that is true, the machine stops looking like overkill and starts looking like the right branch.
Materials, size, and workflow differences that actually matter
The real divide here is not whether both printers can make functional parts. They can. The divide is whether your workflow belongs in the mainstream enclosed lane or in the larger heated-chamber step-up lane.
The P1S is stronger when your part mix stays inside ordinary enclosed-functional-printing territory and you care about staying in the branch with the broadest buyer confidence. The Plus4 is stronger when the enclosure story is not enough on its own and your recurring jobs are pushing you toward more room and a stronger case for hotter-material work.
If you mainly print common enclosed materials in common sizes, the P1S is easier to justify. If your actual jobs keep exposing size limits or you keep filtering purchases through a heated-chamber requirement, the Plus4 starts to separate itself.
Which buyer should choose the Bambu Lab P1S?
Choose the P1S if you want the enclosed printer that is easiest to recommend to a broad range of buyers. It is the better fit for people who want a fast, credible, modern enclosed machine without building their whole buying decision around larger-part economics or more specialized material ambitions.
Which buyer should choose the QIDI Plus4?
Choose the Plus4 if your work already keeps pointing toward more enclosed build room and a stronger heated-chamber lane. It is for buyers who can clearly explain why the step-up matters in their actual parts and workflow, not just why it sounds better on paper.
Bottom line
For most buyers choosing directly between these two, the Bambu Lab P1S is still the better answer because it covers the mainstream enclosed-functional-printing lane with less overbuying risk and broader buyer confidence.
Buy the QIDI Plus4 if your real reason for shopping is larger enclosed capacity and a stronger heated-chamber path. If those needs are recurring and central, the Plus4 is the more believable step-up. If they are not, the P1S is the smarter machine to live with.
Common questions
Is the QIDI Plus4 discontinued?
Yes. QIDI's current Plus4 page says the model is discontinued and no longer in production. Treat any purchasable unit as used, remaining stock or a seller-specific offer whose warranty, return path, condition and included parts must be checked.
Should you buy a used Plus4 instead of a P1S?
Only when repeated supported jobs need the Plus4's 305 x 305 x 280 mm envelope or listed 65 C active chamber and the condition-adjusted price remains compelling. Inspect the exact unit and budget wear parts, shipping, downtime and return risk.
What replaced the QIDI Plus4?
QIDI names Plus5 as the direct successor. Its current page lists a 320 x 320 x 300 mm envelope, 370 C nozzle and 65 C active chamber heat. Compare the complete delivered package and your exact workflow; a successor label does not automatically justify a larger machine.
Does the P1S need a hardened nozzle for CF or GF filament?
Bambu's current P1S page lists a 0.4 mm stainless-steel nozzle and says hard-particle filaments such as CF/GF grades require replacement with hardened steel to prevent excessive wear. Follow the exact spool guidance and inspect the installed parts before printing.
Should a new buyer choose P1S or P2S?
Choose P1S only when the verified regional offer has a meaningful complete-price or package advantage and its 256 mm enclosed workflow meets the job. Choose P2S when that advantage disappears and the current hardened-steel hardware and newer platform are more useful.
Is the QIDI Plus4 better than the Bambu Lab P1S?
It is better for buyers who truly need the larger heated-chamber step-up. The P1S is the better choice for more buyers overall because it sits in the broader, easier-to-justify enclosed lane.
Which printer makes more sense for small shops?
Most small shops will be better served by the P1S unless their actual part mix keeps demanding larger one-piece parts or a stronger heated-chamber case. The Plus4 becomes more compelling when the shop's work is repeatedly outgrowing the mainstream enclosed default.
Should you buy the P1S or step up to the Plus4 for hotter materials?
Step up only if hotter-material and larger enclosed work are recurring needs. If those jobs are occasional or still hypothetical, the P1S is usually the smarter place to stay.
Choose the next move that matches why you are still comparing
Still leaning mainstream enclosed Bambu?
Read P2S vs P1S
Use this when the QIDI path mostly made you realize you still want to sort out the current enclosed Bambu default first.
Still heated-chamber curious?
Read P2S vs QIDI Plus4
Best when you want the cleaner current-default-versus-heated-chamber step-up test rather than the older P1S-centered fork.
Need the serviceability-first alternative?
Read Prusa CORE One vs QIDI Plus4
Use this when the real hesitation is less about Bambu versus QIDI and more about repair-friendlier enclosed ownership versus bigger heated-chamber ambition.
Need production parts more than another machine debate?
Use the buy-versus-service guide first
Best when the bigger question is whether this workload should stay in-house at all or belongs with JC Print Farm. If the job is already defined, you can also request a quote.
Related reading
- Bambu Lab P1S review
- QIDI Plus4 review
- Who Should Buy the Bambu Lab P1S?
- Who Should Buy the QIDI Plus4?
- Best Alternatives to the Bambu Lab P1S
- Best Alternatives to the QIDI Plus4
- Is the Bambu Lab P1S Still Worth It in 2026?
- Is the QIDI Plus4 Worth It in 2026?
- Bambu Lab P2S vs Bambu Lab P1S
- Bambu Lab P2S vs QIDI Plus4
- Bambu Lab X1 Carbon vs QIDI Plus4
- Prusa CORE One vs QIDI Plus4
- 3D printer chooser
If this page is turning into a real next-step decision, start here
This P1S-versus-Plus4 comparison works better when it gives readers one stronger recovery-dryer branch, one calmer dry-then-store lane, and one humidity-proof step instead of turning the whole choice into raw machine specs.
If the more demanding side of this comparison only pays off once opened spools can be recovered harder instead of just being stored a little better: the EIBOS Polyphemus is the cleaner first buy. It fits readers whose enclosed-functional lane is really the heavier materials case. The tighter on-site handoff is the EIBOS Polyphemus review.
If the smarter shared next step is everyday one-spool control without turning the bench into a bigger drying project: the SUNLU S2 dryer is the calmer branch. It matches readers whose better answer is low-drama dry-then-store ownership. The tighter on-site handoff is the SUNLU S2 review.
If you should first confirm whether room or cabinet humidity is making the bigger machine branch look more necessary than it really is: the Govee H5075 hygrometer is the cheaper proof step. It fits readers who should measure before turning moisture drift into a printer-class decision. The tighter on-site handoff is the Govee Mini hygrometer review.
Availability note (July 31, 2026): This path now uses the current Govee H5075. The linked on-site Mini review covers the earlier model, not this exact unit.
That keeps the monetization compact and useful: one stronger dryer, one simpler storage branch, and one cheap humidity check for readers deciding how demanding their enclosed-material workflow really is.