fep_tension_alert
Moderate
Elegoo · Resin (SLA/MSLA) 3D Printers
FEP Film Tension Outside Acceptable Range
Quick Answer
Error code FEP_TENSION_ALERT on your Elegoo Resin (SLA/MSLA) 3D Printers means: FEP Film Tension Outside Acceptable Range. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Visually inspect the FEP film for punctures, cloudiness, or visible deformation
2
Tap the FEP film gently with a finger and listen to the pitch; a properly tensioned FEP should sound like a drum, not a loose membrane
3
If the FEP is stretched or damaged, replace it with a new FEP sheet
4
When replacing FEP, use a tension gauge or the water-pour method to achieve proper tension (refer to Elegoo FEP replacement guide)
5
Tighten the resin vat frame screws evenly in a cross pattern to distribute tension uniformly
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Replacement FEP film (model-specific dimensions, 0.15mm standard thickness)
FEP replacement tool kit with clamp frame
Allen wrenches for vat frame screws
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