Troubleshooting 3D Prints on FLSun Printers
FLSun is the dominant delta-printer brand, and its lineup splits cleanly: V400 and Super Racer are open-frame delta towers, while the T1 and S1 are fully enclosed — the T1 notably holds a constant-temperature chamber rather than just trapping ambient heat.
The FLSun lineup we cover
4 curated FLSun machines are in our knowledge base, taken from the vendor's own OrcaSlicer-family printer profiles: 2 of 4 ship (or come standard) with an enclosure, and 0 of 4 carry a dedicated auxiliary (side/chamber) part-cooling fan in addition to the main print-cooling fan.
| Machine | Enclosed | Aux fan |
|---|---|---|
| FLSun V400 | No | No |
| FLSun Super Racer | No | No |
| FLSun T1 | Yes | No |
| FLSun S1 | Yes | No |
V400 and Super Racer are open-frame deltas with no enclosure. T1 and S1 are fully enclosed — FLSun markets the T1 specifically around its actively-heated, constant chamber temperature rather than passive heat soak. None of the four carry a separate auxiliary fan flag in the profile data.
Cooling and the enclosure question
On the open V400/Super Racer, cooling is entirely down to the part fan — delta kinematics don't change the thermal picture, so ABS/ASA still needs a tent and the usual bed-temperature-and-brim combination. The T1's actively-heated chamber is the standout in this lineup: a constant, controlled chamber temperature does a more consistent job holding ABS/ASA flat than a passively-heated enclosure that drifts with ambient room temperature and print duration. On any FLSun with a warm chamber (T1 especially), watch PLA closely — the same active heating that helps ABS is the wrong environment for PLA's low glass transition.
Baseline settings for FLSun filament profiles
These are the values the vendor's own OrcaSlicer-family profiles ship with for the materials it supports natively; use them as your starting point, then adjust per spool with the calibrations linked below.
| Material | Nozzle | Bed (textured) | Fan max |
|---|---|---|---|
| PLA | 220 °C | 45 °C | 100 % |
| PETG | 255 °C | 80 °C | 90 % |
| ABS | 260 °C | 105 °C | 80 % |
| TPU | 240 °C | 35 °C | 100 % |
What tends to go wrong on FLSun printers
First-layer inconsistency specific to delta geometry. Deltas depend on accurate tower endstop and bed-level calibration in a way Cartesian printers don't; a first layer that's good in the center but thin or gouged toward the edges usually means the delta calibration (not the slicer's first-layer settings) needs a re-run. See the first-layer calibration guide for the general leveling logic, then consult your delta's calibration routine.
ABS/ASA warping on the open V400/Super Racer. No enclosure: maximise bed temperature, minimise part-cooling fan, brim. See the ABS/ASA warping guide.
PLA drooping in the T1's heated chamber. If fine overhangs sag on PLA specifically, the T1's constant chamber heat is the first suspect — not the fan curve. Compare against the PLA guide's stock cooling numbers.
Before you assume it's a setting
None of the numbers above are FLSun-specific magic — they're the vendor's own OrcaSlicer-family profile defaults, which means they carry the same caveat every third-party filament profile does: they're a starting point, not a guarantee. Two checks catch most "the settings are wrong" reports before they turn into hours of random tweaking:
- Run flow-ratio calibration on any filament that isn't the exact brand the profile was written for. A generic or off-brand spool can be several percent off the stock flow ratio, and that shows up as over- or under-extrusion that looks like a slicer problem but isn't.
- Confirm the plate type in the slicer matches the plate on the bed. Mismatched plate selection is the single most common cause of a print that "should have stuck" on any of these machines, FLSun included.
Whatever you're chasing beyond that, the general fix is the same everywhere: change one variable, print a small test, read the result before touching the next value. The diagnosis tool turns your specific machine, filament and symptom into that ordered list automatically.
Frequently asked questions
Which FLSun printers are enclosed?
The FLSun T1 and S1 are fully enclosed, while the V400 and Super Racer are open-frame delta towers. The T1 stands out because it holds an actively heated, constant chamber temperature rather than just trapping ambient heat. None of the four FLSun machines carry a dedicated auxiliary (side/chamber) part-cooling fan.
What temperatures do FLSun profiles use for PLA, PETG and ABS?
FLSun's own OrcaSlicer-family profiles ship with PLA at 220 °C nozzle and 45 °C textured bed (fan 100 %), PETG at 255 °C and 80 °C (fan 90 %), ABS at 260 °C and 105 °C (fan 80 %), and TPU at 240 °C and 35 °C. Treat these as starting points and calibrate flow ratio per spool.
Why is my first layer fine in the center but bad at the edges on an FLSun delta?
That pattern usually means the delta calibration needs a re-run, not the slicer's first-layer settings. Deltas depend on accurate tower endstop and bed-level calibration in a way Cartesian printers don't, so a first layer that is good in the center but thin or gouged toward the edges points at the printer's delta calibration routine.
Not sure which fix applies to your FLSun printer?
Answer five quick questions about your printer, filament and build plate, and our rule engine turns them into a prioritized fix list with exact slicer values — the same knowledge these guides are written from.
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- OrcaSlicer vendor profiles — SoftFever/OrcaSlicer (GitHub)