After a week and more than 100 hours of printing, the Snapmaker U1 earned my recommendation for multicolor PLA and mixed-material support work. The 22-hour four-color turtle finished without an issue, PETG and TPU worked with PLA supports, and a PVA support-interface experiment released cleanly after soaking. The week also exposed two limits worth understanding: a toolhead alignment problem after I moved the printer, and a failed PA6-CF print on the machine without a fully enclosed chamber.
I bought this U1 for testing. This is my hands-on follow-up to the Snapmaker U1 setup and first-print guide, based on the finished video below. It covers one busy week, not months of ownership. The results are specific to the prints and configuration shown; they do not establish a lifetime reliability rate or a universal material profile.
Quick verdict: the support workflow is as useful as the colors
What impressed me most was being able to give different materials different jobs. Four-color PLA is an obvious reason to want four toolheads, but printing a PETG or TPU part with a different support material solves a practical problem: getting the supports off afterward.
The U1 handled the demonstrated PETG/PLA and TPU/PLA combinations well. It also let me reserve dissolvable PVA for the contact points between a PLA support structure and a PLA model. That reduced how much PVA I used, while creating a way to release otherwise awkward supports.
My recommendation has boundaries. I would consider the U1 for repeated multicolor printing and support-heavy projects in the materials that worked here. I would not use this video as evidence that the stock, open-top machine is ready for dependable PA6-CF work. That test failed, and the enclosure and nozzle configuration need separate attention.
What I tested, and what happened
The video moves from longer PLA projects to mixed materials, flexible parts, soluble support interfaces, and finally carbon-fiber-filled nylon. These are reported outcomes, not standardized laboratory benchmarks.
| Test | What I printed | Reported result | Main lesson |
|---|---|---|---|
| Four-color PLA | Turtle, about 22 hours | Completed without issues, including overnight printing | A successful extended four-color job; tower and loading waste still existed |
| Longer PLA project | Multicolor T-rex across three plates, about 62 hours total | Early tool alignment issue; no further issue reported after recalibration | Recalibrate after relocating the printer |
| PETG with PLA components | PETG shell with PLA caps | Printed successfully | Separate toolheads handled the demonstrated material assignments |
| PETG with PLA supports | Two parts, including a more detailed model | Successful swaps and prints; no stringing reported in those tests | Different support material can be a useful reason to own a toolchanger |
| TPU with PLA supports | A supported part and a football assembled from two plates | Successful prints; football went into use | Plan support removal before committing to a flexible model |
| PLA with PVA contact points | PLA model and support bases, PVA at the model contacts | Contacts released after roughly 16–18 hours in water; some PLA stayed trapped inside | Dissolving the interface does not dissolve the rest of the support |
| PA6-CF | Carbon-fiber-filled nylon part | Separation and failed print | This open-chamber attempt did not validate a nylon workflow |
Observed results from Rob’s seven-day Snapmaker U1 review
The 62-hour figure describes three plates together. It is not a claim that one uninterrupted print lasted 62 hours. Likewise, the more-than-100-hour total is my reported print time for the week, not an independently logged uptime measurement.
Four-color PLA: the 22-hour turtle
The first extended PLA test was a turtle in four colors. I wanted a longer multicolor job that would exercise the printer beyond a short demonstration. It ran for about 22 hours, including overnight, and I reported no issues with that print.
That result matters because a print with repeated color changes relies on more than one good first layer. It asks the machine to keep returning to the right tools throughout the job. The turtle provided encouraging real-use evidence that the four-tool workflow could carry a project through a long session.
What “no purge waste” means in this review
In the video I describe the turtle as having zero purge waste, then explain the exceptions: the tower and the small amount extruded while loading filament. The accurate takeaway is that I did not have the repeated single-nozzle color-flushing waste I was looking to avoid. It is not a zero-waste print.
There was still extra material beyond the turtle itself. I did not weigh it in this review or run an identical comparison job on another printer, so there is no measured waste percentage or time-saving percentage to quote. Keep the tower and loading material in your own estimates.
Before a large project, use the multicolor print planner with your actual slicer estimates. Enter the tower material as well as the model material, and use an observed tool-change time if you have one. The turtle's success supports the workflow; it does not provide all the numbers needed to price your next model.
The 62-hour T-rex project and the recalibration lesson
The larger multicolor PLA project was a T-rex divided across three build plates. Together those plates represented about 62 hours of printing. An issue appeared near the beginning of the first plate: one toolhead did not line up correctly during a change.
Before that happened, I had moved the printer from my desk to the floor, to another desk, and finally to its shelf. I suspected those moves were responsible. I recalibrated the U1 in its new position and reported no further issue over the subsequent project printing.
That is the useful distinction: the alignment problem happened, recalibration resolved the observed symptom, and moving the printer was my explanation. I did not isolate the cause in a controlled test. Calling it a proven mechanical defect would go beyond the evidence, but leaving it out would hide an intervention that mattered.
For an owner, the practical response is straightforward. Decide where the printer will live, then run the relevant calibration there before starting an expensive multiday project. If you relocate it, recalibrate before assuming the previous baseline still applies. The calibration and slicer settings hub provides a broader path for making controlled adjustments.
If an alignment problem persists after calibration, this video does not supply a hardware repair procedure. Use the current manufacturer instructions for your machine and symptoms rather than treating my successful recalibration as a guaranteed fix for every tool-change failure.
PETG and PLA: separate parts and separate support roles
The next test combined a PETG shell with PLA caps, including the yellow pieces shown in the video. I reported that it printed successfully. This demonstrated the material assignments used for that project; it was not a bond-strength test between PETG and PLA.
I then printed two PETG models with PLA supports. One was followed by a more detailed model using the same basic arrangement: PETG for the main body, PLA for the supports, and separate toolheads for the two materials. I reported no problems with the swaps or the prints, and no stringing in those PETG support tests.
The reason to pay attention is the separation of roles. A second material does not have to become a visible color accent in the final part. It can be temporary scaffolding selected because it makes cleanup more manageable. That can be a more useful everyday benefit than adding another color.
The finished review does not provide a complete profile: exact nozzle and bed temperatures, interface spacing, speeds, filament brands, and layer heights are not documented. I cannot turn those successful prints into a copy-and-paste recipe. Treat the material combination as a demonstrated option and validate it on a small representative part before scaling up.
TPU with PLA supports: the flexible-print test
TPU was next. For the first flexible part, I used TPU for the part itself and PLA for the supports. My reason was support removal: TPU supports attached to TPU can be difficult to remove, whereas the PLA support approach was easier in this workflow. The test completed successfully.
I followed it with a football assembled from two build plates: the ball and its tail. Both used some PLA supports, including at the bottom of the ball and at the bottom of the tail. I reported successful results, and the kids had already been using the finished football when I filmed the review.
That is a useful practical outcome, but it is not a durability certification. The video does not establish TPU hardness, an exact printing speed, a measured impact resistance, or a lifetime under repeated use. It shows that these flexible parts printed and that the assembled football was usable.
For a similar project, inspect the support locations before printing. Ask where each support touches the flexible part, how you will grip it, and whether it can leave the model without tearing or trapping anything. Those are general planning checks, not additional tests I performed in the video.
PVA interfaces: clean release, with a hollow-model catch
The PVA experiment was more involved. I printed the main model in PLA and also used PLA for the base of the support structures. PVA was assigned only to the connectors where the tree supports met the model—the support contact or interface regions.
I chose that arrangement because I wanted to use less of the more expensive soluble material. Instead of making the entire support structure from PVA, I kept the bulk in PLA and reserved PVA for the places where separation mattered.
After soaking the print in water overnight, the PVA dissolved and the contact points separated cleanly. My estimate in the video was roughly 16 to 18 hours. That is the time for this example, not a promised dissolution time for every PVA brand, support thickness, or water condition.
Why there was still support inside the model
The hollow body created a catch. Some PLA support remained inside it after the PVA dissolved. I could not reach in to remove that material; it was visible and could rattle around when the model moved. Dissolving the contact layer did exactly what it was intended to do, but the surrounding PLA support still needed a physical exit.
Some of the external tree supports also wrapped around the model. Even after their contacts released, I had to break up parts of the support structure to take it away. Clean release and easy extraction are two different problems.
Before choosing an interface-only PVA strategy, check every enclosed or hollow area in the sliced model. If solid PLA support will become trapped, reducing PVA consumption may create a cleanup problem you cannot solve afterward. A fully soluble support approach may be worth evaluating for inaccessible areas, but this video did not demonstrate that alternative on the same model.
Drying and build-plate preparation
I emphasized using PVA from a dry box. I also cautioned about PVA adhesion on a textured plate and suggested a smooth plate or suitable adhesive when printing the whole support structure in PVA. Those were handling recommendations in the review, not a controlled comparison of plates or adhesives.
Use the instructions for your particular PVA and build surface when choosing drying and adhesion settings. The filament and materials hub is the next place to work through preparation and material selection. No specific drying temperature or adhesive brand was verified in this test.
PA6-CF failed: what the test actually tells us
The final test used PA6-CF, a carbon-fiber-filled nylon. The machine was not fully enclosed, and it still had stainless-steel nozzles rather than hardened tips. I expected this attempt might fail, and it did.
It initially appeared to print, then developed separation. I suspected the air conditioning had started and introduced a breeze into the open chamber. The part began coming apart. That is my diagnosis from the session, not a measured chamber-temperature study, so I cannot call it a proven single cause.
This also needs to remain separate from the earlier tool alignment issue. Recalibration addressed the tool-changing problem. It did not make the PA6-CF test successful, and the failed nylon part should not disappear behind the overall positive verdict.
Snapmaker's official U1 specifications, checked September 17, 2026, list four toolheads, a 270 × 270 × 270 mm build volume, stock 0.4 mm stainless-steel nozzles, a 300°C maximum nozzle temperature, and a 100°C maximum bed temperature. The material table separates basic materials from those requiring a top cover, and lists fiber-reinforced polymers with both a top cover and hardened-steel nozzle. These are manufacturer specifications, not measurements from my week of testing.
The practical conclusion is to check the complete hardware configuration before choosing an engineering filament. A maximum nozzle temperature alone does not establish a successful material workflow. This review did not test a completed enclosure/nozzle upgrade or establish a working PA6-CF profile. I mentioned future modifications in the video, but they remain outside these results.
Who I would recommend the U1 to
My week with the U1 makes the strongest case for a maker who regularly prints multiple colors or wants to use different support materials. The turtle and T-rex cover the multicolor side; the PETG, TPU, and PVA experiments show why independent materials matter beyond appearance.
The strengths were successful extended PLA jobs, successful material swaps in the demonstrated support tests, and avoiding the repeated color-flushing waste associated with sharing one nozzle. I also enjoyed using the machine enough to say it might become my favorite, while acknowledging that more testing was still ahead.
The friction is equally concrete: placement and recalibration matter, soluble supports add drying and soak time, support geometry can trap material, and the tested configuration was not enough for the PA6-CF attempt. A four-tool system does not remove the need to plan the material and cleanup workflow.
If your work is almost entirely single-color parts with easy supports, this review offers less reason to add a toolchanger to your shop. If your main requirement is dependable filled-nylon production, wait for evidence from a suitable configuration rather than treating this failed experiment as qualification. I did not measure noise, power consumption, dimensional accuracy, tool-change counts, or long-term wear in this review.
A practical checklist before your next long print
The following is a planning workflow drawn from the week's lessons, not a claim that every setting was tested in the video.
- Put the printer in its intended location and complete calibration after any move.
- Start from a successful baseline print before committing to a long, complex project.
- Assign the model, support body, and support interface materials deliberately; check the assignments in the sliced preview.
- Include tower material and filament-loading waste in your estimate, even with separate toolheads.
- Check how every support will come out, especially inside hollow bodies and around enclosed geometry.
- If using PVA, prepare and feed it according to its drying requirements and leave time for dissolution and cleanup.
- Confirm nozzle, build surface, and enclosure requirements for the exact filament before moving into engineering materials.
- Try an unfamiliar support combination on a small representative section before starting a large model.
Frequently asked questions
Did anything break during the week?
I did not report a broken printer component. I reported a toolhead alignment problem that resolved after recalibration, plus a PA6-CF print that failed through separation. Those are different outcomes and both belong in the review.
Was the U1 completely waste-free?
No. The turtle still used a tower and a small amount of material during filament loading. The video did not include a weighed comparison against a single-nozzle machine.
Can the U1 print TPU with PLA supports?
The TPU parts in this review printed successfully with PLA supports, including the two-plate football project. The result does not supply a universal profile for every TPU hardness or model.
Does a PVA interface remove all the supports?
It releases the contact points when it dissolves. In my hollow model, some PLA support stayed inside because I could not physically extract it. Interface-only PVA is useful when the remaining support can be removed.
Is this a long-term reliability verdict?
It is a one-week review after more than 100 hours of reported print time. That is more informative than a first-print impression, but it does not answer questions about months of wear, maintenance frequency, or fleet reliability.
Where to go next
For assembly and the original calibration session, start with the U1 setup and first prints. For choosing your next support combination, continue through the filament and materials guides. Before sending a large color project, use the multicolor planner to put its material and time requirements in context.
My verdict after this week is positive: the U1 worked well for the PLA, PETG, TPU, and PVA workflows demonstrated here. The next step is to build on those successful baselines deliberately, while treating enclosure-dependent materials and longer-term reliability as separate questions that still need their own evidence.
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