CalibrationMedium17 minReviewed 18 Jul 2026

Dimensional Accuracy and Fit Tolerance

Fix holes that print too small, pegs that are too large, and multipart designs that do not fit.

Fast answer

Calibrate flow and mechanics first, then use model-specific clearance or hole compensation. Do not globally scale an axis until measurement proves a true axis error.

Visual guide showing the problem, target result and repair path for dimensional accuracy and fit tolerance — **See it before changing settings.**Outer dimensions are close but holes are tight Compare your print with the visual, then follow the repair order below.

Visual repair path

See the sequence before you start

Match the visible symptom, work through the four visual checkpoints, and prove the result with a small test.

Target resultRepeated parts measure consistently.

Checkpoint 1Use accurate calipers and measure a known calibration part.Open step →Checkpoint 2Fix first-layer elephant foot before judging XY fit.Open step →Checkpoint 3Calibrate flow/extrusion.Open step →Checkpoint 4Check belts, pulleys, steps/mm or rotation distance only with a reliable…Open step →

Choose how you want to troubleshoot

Start fast or open every detail

Quick Fix keeps the safest first checks and proof steps in view. Full Guide reveals the complete settings, printer context, advanced tests, sources and FAQs.

Quick Fix mode is active.

Start hereOver-extrusion or elephant foot

Extra material changes features.

Success should look like

Repeated parts measure consistently.
Fit works in the intended orientation.

Safe workflowOne change at a time

Use the smallest useful test, keep the winning change, and record the result.

Optional context

Make this guide easier to apply to your setup

Select what you use. The page highlights relevant material, slicer and printer notes without hiding the complete source-backed guide.

Printer typeExtruder setupMaterialSlicerNozzle size

General guide view

Choose any setup details above to emphasize matching notes and produce a safer starting summary.

Guided repair journey

Know what to do now—and what comes next

Follow one controlled path. Do not stack unrelated changes before the proof test.

Typical first pass 10–30 min

1
Confirm the visual clue
Compare the failed area with the problem and target visuals.
2
Run the safest first checks
Run the first safe check and change one variable at a time.
3
Print the proof test
A small representative test no longer shows the original symptom.
4
Escalate only if needed
Use the next-route guides only when the original symptom remains.

Issue-specific visual evidence for dimensional accuracy and fit tolerance

V906 premium evidence panel

Read the failure before changing a setting

Visible clueOuter dimensions are close but holes are tight

Most likely starting causeOver-extrusion or elephant foot

Extra material changes features.

First safe actionUse accurate calipers and measure a known calibration part.

Proof targetRepeated parts measure consistently.

Open the verification test →

Visual symptom selector

Which description is closest to what you see?

Select the closest match. This does not replace inspection; it moves the most relevant starting point to the front.

Best first starting point

Over-extrusion or elephant foot

Extra material changes features.

Open step 1 →

Before you change settings

Confirm the exact printer, material, nozzle or resin, slicer, and recent hardware changes.
Photograph the failure before removing the print so the evidence is not lost.
Return extreme overrides to a known profile and change one variable at a time.
Use a small calibration object or representative section before repeating a long print.

STLBEAST diagnostic map

Recognize it, check safely, prove the fix

Use this map before changing multiple settings. The detailed procedure and source references follow below.

ProblemOuter dimensions are close but holes are tight

Target resultRepeated parts measure consistently.

Fastest safe order

Use accurate calipers and measure a known calibration part.
Fix first-layer elephant foot before judging XY fit.
Calibrate flow/extrusion.
Check belts, pulleys, steps/mm or rotation distance only with a reliable measurement method.

Stop immediately for

Change one variable at a time and keep every adjustment inside the printer, hotend, build-surface, and filament manufacturer limits.

Proof of success

Repeated parts measure consistently.

What it looks like

Outer dimensions are close but holes are tight
Pegs and slots do not assemble
Bottom dimensions are swollen
Different orientations produce different fit

Most likely causes

Over-extrusion or elephant footExtra material changes features.
Hole geometry and line placementFDM holes often print undersized.
Mechanical steps/belt errorAxis motion does not match command.
Shrinkage and material choiceCooling changes final size.
Model clearance is too small for the processCAD assumes perfect manufacturing.

Action plan

Repair sequence

Work from top to bottom. Stop when the failure is resolved, verify it with a small test and record the successful setup.

Step 1
Use accurate calipers and measure a known calibration part.
Step 2
Fix first-layer elephant foot before judging XY fit.
Step 3
Calibrate flow/extrusion.
Step 4
Check belts, pulleys, steps/mm or rotation distance only with a reliable measurement method.
Step 5
Test holes/pegs in the same orientation as the real part.
Step 6
Use slicer hole/XY compensation only after mechanics and flow are correct.
Step 7
Update CAD clearance based on repeated process capability.

Safety and accuracyChange one variable at a time and keep every adjustment inside the printer, hotend, build-surface, and filament manufacturer limits.

Tune carefully

Settings to review

Setting	How to use it
XY compensation	Apply cautiously; it affects many features.
Hole compensation	Prefer when only internal holes are consistently small.
First-layer compensation	Use for elephant foot, not global size.
Wall order	Can influence dimensional accuracy.

Material notes

PLA

Stable for many fit tests.

PETG

Flexible/sticky behavior can affect snap fits.

ABS/ASA

Shrinkage and enclosure conditions matter.

Printer context

Bedslinger

Check bed seating, gantry alignment, belts, wheels and first-layer consistency across the plate.

CoreXY

Start with the official profile; inspect belt balance, input shaping, flow, pressure advance and chamber conditions.

Delta

Confirm delta calibration, tower movement, belt tension, effector stability and full-bed mapping.

Resin / SLA

Use resin-specific exposure, lift, support, temperature, wash, cure and protective procedures.

Where to look in the slicer

OrcaSlicer / Bambu Studio

Quality, Strength, Speed, Support and Filament; use built-in calibration for temperature, flow and pressure advance.

PrusaSlicer

Print, Filament and Printer Settings; inspect the layer preview before export.

Cura / Creality Print

Quality, Walls, Top/Bottom, Material, Speed, Travel, Cooling, Support and Adhesion.

Resin slicers

Printer/resin profile, exposure, lift/retract, support contact, raft, hollowing and drain settings.

Controlled test method

Do not repeat the full print while guessing. Use a small test that reproduces the same feature and record the result.

Save the current profile or photograph every relevant setting.
Choose one suspected cause from the ranked list and change only the matching variable.
Print the smallest useful test with the same material, nozzle, plate, and environment.
Compare the result with the target visual, keep the winning change, and then test the real model.

Standardized proof test

Confirm the repair before repeating the full print

Test model20 mm calibration cube plus fit coupon

Setup

Use the target profile and measure after the part fully cools.

Pass condition

Dimensions and mating features fall within the required tolerance.

If it still fails

Axes or holes remain consistently oversized or undersized.

Next controlled action

Separate motion calibration from flow, shrinkage and hole compensation.

Recheck the visual diagnosis →

If the proof test still fails

Do not repeat the same change—follow the next strongest path

These crawlable, issue-specific links give visitors and search engines a clear relationship between overlapping 3D-printing failures.

Visual troubleshooting guide for elephant foot fix

Next path 1Elephant Foot Fix

Open this related First Layer guide when the first repair path does not fully explain the remaining symptom.

Open this guide →

Visual troubleshooting guide for flow rate and extrusion multiplier calibration

Next path 2Flow Rate and Extrusion Multiplier Calibration

Use this next when the symptom changes with extrusion width or wall thickness.

Open this guide →

Visual troubleshooting guide for pressure advance / linear advance tuning

Next path 3Pressure Advance / Linear Advance Tuning

Use this next when corners, seams or speed changes leave blobs or gaps.

Open this guide →

Proof before you move on

How to verify the fix

Repeated parts measure consistently.
Fit works in the intended orientation.
Bottom and upper dimensions match.
Compensation is documented per printer/material.

Run the smallest useful test first.

Choose a result after the print so the guide can point you to the correct next action.

Keep the winning setup

Prevent it next time

Design test coupons.
Record measured clearance.
Avoid relying on one calibration cube.
Recalibrate after nozzle or motion changes.

Printer Settings

Useful public sample. Complete personalized profile for members.

Everyone can use the full guide and receive a safe starting sample. Members unlock all machine/material values, adjustment order, saved Profile Vault history and deeper AI Doctor linkage.

XY compensationApply cautiously; it affects many features.

Hole compensationPrefer when only internal holes are consistently small.

Try settings sample Compare membership

Sources and further reading

These references support the troubleshooting sequence. Follow the printer, slicer, filament, resin, and build-surface manufacturer limits for your exact equipment.