Calibration

Complete Calibration Guide

Fine-tune your printer settings for perfect print quality

Why Calibration Matters

Every 3D printer is unique, and every filament behaves differently. Proper calibration ensures dimensional accuracy, optimal surface quality, and reliable prints. OrcaSlicer includes built-in calibration tools that make this process straightforward.

Recommended Order: Temperature → Flow Rate → Pressure Advance → Retraction

Accessing Calibration Tools

In OrcaSlicer, go to Calibration in the top menu. You'll find all calibration tests organized by category.

1. Temperature Tower Calibration

The temperature tower helps you find the optimal printing temperature for your specific filament.

How It Works

A temperature tower prints multiple sections at different temperatures. You examine each section to find the best balance of strength, appearance, and bridging performance.

Steps

  1. Go to Calibration > Temperature
  2. Select your filament type (PLA, PETG, ABS, etc.)
  3. Set the temperature range (e.g., 190-220°C for PLA)
  4. Set the temperature step (typically 5°C)
  5. Click Generate and print the tower

Evaluating Results

  • Layer adhesion: Try to break each section - good adhesion means proper bonding
  • Stringing: Look for thin strings between features
  • Bridging: Check the horizontal bridges for sag
  • Surface quality: Look for smooth, consistent layers
  • Overhangs: Examine the angled surfaces for drooping

2. Flow Rate Calibration

Flow rate determines how much filament is extruded. Incorrect flow leads to over-extrusion (blobs, rough surfaces) or under-extrusion (gaps, weak parts).

Steps

  1. Go to Calibration > Flow Rate
  2. Select Pass 1 for coarse calibration
  3. Print the test and identify the best-looking cube
  4. Run Pass 2 with the value from Pass 1 for fine-tuning
  5. Update your filament's flow ratio with the final value

What to Look For

  • Top surface: Should be smooth without gaps or ridges
  • Walls: Should be straight without bulging
  • Dimensional accuracy: Measure with calipers if precision is critical

3. Pressure Advance Calibration

Pressure advance compensates for the pressure buildup in the extruder. This reduces bulging at corners and improves print quality at higher speeds.

Note: Pressure advance requires firmware support. It's available on Klipper and Marlin (Linear Advance). Bambu Lab printers have this built-in.

Steps

  1. Go to Calibration > Pressure Advance
  2. Set the PA range (0.0 to 0.1 for direct drive, 0.0 to 1.0 for Bowden)
  3. Print the test pattern
  4. Find the line with the cleanest corners
  5. Calculate your PA value based on the line number

4. Retraction Calibration

Retraction pulls filament back during travel moves to prevent stringing and oozing.

Steps

  1. Go to Calibration > Retraction Test
  2. Set your retraction length range (0.2-2mm for direct drive, 2-8mm for Bowden)
  3. Set retraction speed range (typically 20-60 mm/s)
  4. Print the test towers

Evaluating Results

  • Stringing: Thin strings indicate insufficient retraction
  • Blobs: May indicate too much retraction
  • Surface quality: Excessive retraction can cause gaps

Saving Your Calibration

After completing calibration, update your filament profile with the optimized values for temperature, flow ratio, pressure advance, and retraction settings.

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