A detailed STLBEAST repair guide to square the X gantry before compensating in software. 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 power off and compare both sides, then square the gantry mechanically. 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: Nozzle height differs left to right or the gantry drops when motors are off.
Keep the problem and target visual open while you make this change.
Why this matters
One lead screw starts higher than the other.
Setting or checkAcceleration
Return to a conservative baseline before diagnosing mechanical motion.
Expected result
The gantry is mechanically level and remains stable through travel.
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
The assembly twists under load.
Setting or checkTravel speed
High speed can expose play, binding, or resonance.
Expected result
The same test succeeds at least twice without a new artifact appearing.
Step 3 of 8
Check dual-z sides out of sync. Power off and compare both sides.
Keep the problem and target visual open while you make this change.
Why this matters
One side binds while the other drops.
Setting or checkInput shaping
Apply only after belts, frame, wheels, rails, and pulleys are sound.
Expected result
No safety warning, unusual noise, heater error, binding, or material damage is introduced by the change.
Step 4 of 8
Check loose frame or gantry hardware. Square the gantry mechanically.
Keep the problem and target visual open while you make this change.
Why this matters
One Z drive does not transfer motion consistently.
Setting or checkMotor current
Use only manufacturer-supported values; excess current creates heat.
Expected result
The successful values are recorded with printer, nozzle, material, slicer, and date.
Step 5 of 8
Inspect uneven wheel/eccentric adjustment. Check wheels and couplers.
Keep the problem and target visual open while you make this change.
Why this matters
One lead screw starts higher than the other.
Setting or checkAcceleration
Return to a conservative baseline before diagnosing mechanical motion.
Expected result
The gantry is mechanically level and remains stable through travel.
Step 6 of 8
Rule out coupler or lead screw issue. Re-run mesh only after alignment.
Keep the problem and target visual open while you make this change.
Why this matters
The assembly twists under load.
Setting or checkTravel speed
High speed can expose play, binding, or resonance.
Expected result
The same test succeeds at least twice without a new artifact appearing.
Step 7 of 8
Change only the single setting or hardware condition supported by the evidence, then run a small test that reproduces the original failure.
Keep the problem and target visual open while you make this change.
Why this matters
One side binds while the other drops.
Setting or checkInput shaping
Apply only after belts, frame, wheels, rails, and pulleys are sound.
Expected result
No safety warning, unusual noise, heater error, binding, or material damage is introduced by the change.
Step 8 of 8
Compare the test against the target condition, record the successful value, and save it in a printer/material profile before repeating the full print.
Keep the problem and target visual open while you make this change.
Why this matters
One Z drive does not transfer motion consistently.
Setting or checkMotor current
Use only manufacturer-supported values; excess current creates heat.
Expected result
The successful values are recorded with printer, nozzle, material, slicer, and date.
Controlled test log
Change one variable, then record what happened
This keeps temperature, retraction, speed, mechanical, and material tests from blending together. The history stays private in this browser.
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