A detailed STLBEAST repair guide to close visible gaps without crushing the first layer. Learn how to recognize the symptom, rank the likely causes, apply safe fixes in order, verify the result, and prevent the failure from returning.
Start hereStart with lower z offset slightly, then return first-layer flow to baseline. Confirm the result with a short representative test before changing additional settings.
First safe actionRun the first safe check and change one variable at a time.
Proof targetA small representative test no longer shows the original symptom.
Match the failed area to the visual before changing a setting.
Repair progress0 of 8 complete
Step 1 of 8
Document the failure and confirm that it matches this guide: Separate lines leave the build surface visible between passes.
Keep the problem and target visual open while you make this change.
Why this matters
The filament is placed instead of gently compressed.
Setting or checkZ offset
Tune only after cleaning and leveling; use very small changes.
Expected result
Adjacent lines touch cleanly without ridges or transparent scraping.
Step 2 of 8
Return extreme overrides to a known printer, nozzle, material, and slicer profile so the diagnosis starts from a stable baseline.
Keep the problem and target visual open while you make this change.
Why this matters
Not enough material fills the intended line width.
Setting or checkFirst-layer speed
Slow enough to bond before direction changes pull the line.
Expected result
The same test succeeds at least twice without a new artifact appearing.
Step 3 of 8
Check z offset too high. Lower Z offset slightly.
Keep the problem and target visual open while you make this change.
Why this matters
Intermittent flow produces thin sections.
Setting or checkFirst-layer temperature
Stay inside material and surface limits.
Expected result
No safety warning, unusual noise, heater error, binding, or material damage is introduced by the change.
Step 4 of 8
Check first-layer flow too low. Return first-layer flow to baseline.
Keep the problem and target visual open while you make this change.
Why this matters
The slicer expects more overlap than the machine produces.
Setting or checkCooling
Delay or reduce early fan when the material requires it.
Expected result
The successful values are recorded with printer, nozzle, material, slicer, and date.
First LayerFirst-Layer Ridges and Excess Overlap
First LayerBubbles or Blisters in the First Layer
First LayerSmooth PEI Adhesion Guide
