Getting Great Prints on the FLSun V400
The V400 is FLSun's flagship open-frame delta — large build volume, delta speed, no enclosure and no auxiliary fan. Delta kinematics change almost nothing about material cooling, but they change everything about first-layer calibration.
Is the FLSun V400 enclosed?
Enclosure: No. Auxiliary part-cooling fan: No.
Open-frame with no enclosure: PLA/PETG print close to stock predictions and ABS/ASA need the standard tent-and-brim treatment, exactly like any open Cartesian bedslinger. The delta-specific difference is entirely in motion and leveling, not in thermal behavior.
Baseline settings for FLSun's FLSun V400 profile
FLSun publishes one shared filament-profile baseline across its OrcaSlicer-family lineup rather than a separate one per model, so these are the numbers the FLSun V400 starts from — use them as the floor and calibrate flow/retraction per spool:
| Material | Nozzle | Bed (textured/hot) | 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 % |
Delta-specific tuning, not material-specific
First-layer problems on a delta are usually calibration, not slicer settings. Tower endstop and bed-level calibration drift is the leading cause of first layers that are good in the middle but thin or gouged near the edges. Re-run the delta calibration routine before touching first-layer speed or temperature. See the first-layer calibration guide for the general leveling logic.
ABS/ASA warping. No enclosure to help: tent it, maximise bed temperature within range, minimise part-cooling fan, brim generously. See the ABS/ASA warping guide.
Ringing at delta speed. Deltas can ring differently from Cartesian printers because all three towers contribute to every XY move; check tower belt tension evenly before chasing acceleration settings. See the ghosting guide.
Symptoms this machine's form factor is prone to
Without a chamber, the FLSun V400 inherits the classic open-printer failure modes in full: warping and adhesion loss on hot materials, and higher sensitivity to room drafts than any enclosed machine has to deal with:
- Warping and bed adhesion — the two symptoms an enclosure would otherwise mitigate.
- First-layer problems — open frames are more exposed to bed-leveling drift from handling and transport.
- Ghosting and ringing — lighter open frames typically need more belt-tension attention than an enclosed cube at the same speed.
A sane first-print checklist
- Match the plate/surface selection in the slicer to what's actually on the bed, if the machine supports more than one build surface. Mismatches are the leading cause of "it should have stuck" reports.
- Run a flow-ratio calibration on any filament that isn't the exact spool FLSun's profile was written against. Off-brand and generic spools routinely land several percent off the stock flow ratio; that shows up as over- or under-extrusion that looks like a hardware problem but isn't.
- Change one variable per test print. Temperature, fan speed and retraction all interact; the fastest way to a dialed-in FLSun V400 is small, single-variable tests read one at a time, not three changes at once.
For the full FLSun lineup and its common failure modes, see the FLSun troubleshooting hub.
Frequently asked questions
What temperatures should I use on the FLSun V400?
FLSun’s stock profile starts PLA at 220 °C nozzle and 45 °C bed with 100 % fan, PETG at 255 °C and 80 °C with 90 % fan, ABS at 260 °C and 105 °C with 80 % fan, and TPU at 240 °C and 35 °C with 100 % fan. Treat these as the floor and calibrate flow and retraction per spool — FLSun shares one filament baseline across its whole lineup.
Why is my first layer bad on the FLSun V400?
On a delta like the V400, first-layer problems are usually calibration, not slicer settings. Drift in the tower endstop and bed-level calibration is the leading cause of first layers that look good in the middle but come out thin or gouged near the edges. Re-run the delta calibration routine before touching first-layer speed or temperature.
Can the FLSun V400 print ABS without an enclosure?
Not reliably as-is: the V400 is open-frame with no enclosure and no auxiliary fan, so ABS and ASA need the standard workaround — tent the printer, maximise bed temperature within range (the profile uses 105 °C), minimise the part-cooling fan and add a generous brim. PLA and PETG, by contrast, print close to stock predictions on this machine.
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