FDM (Fused Deposition Modeling) process in 3D Printing - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does FDM stand for in 3D printing?

FDM stands for Fused Deposition Modeling, a popular 3D printing process where melted material is deposited layer by layer to build an object.

beginner

How does the FDM process create a 3D object?

FDM creates objects by heating a plastic filament until it melts, then extruding it through a nozzle to lay down thin layers that harden and stack to form the final shape.

beginner

Name two common materials used in FDM printing.

Two common materials used in FDM printing are PLA (Polylactic Acid) and ABS (Acrylonitrile Butadiene Styrene). Both are thermoplastics that melt when heated and solidify when cooled.

intermediate

What is the role of the heated nozzle in FDM printing?

The heated nozzle melts the plastic filament so it can be precisely deposited layer by layer. It controls the flow and placement of the material to build the object accurately.

intermediate

Why is layer-by-layer deposition important in FDM?

Layer-by-layer deposition allows complex shapes to be built from the bottom up. Each layer bonds to the previous one, creating a strong, detailed 3D object without the need for molds or cutting.

What is the main material form used in FDM printing?

A Plastic filament

B Liquid resin

C Metal powder

D Paper sheets

FDM uses plastic filament that is melted and extruded to build objects layer by layer.

Which part of the FDM printer melts the filament?

A Heated nozzle

B Build platform

C Cooling fan

D Filament spool

The heated nozzle melts the filament so it can be deposited precisely.

What happens after each layer is deposited in FDM printing?

A It changes color

B It evaporates

C It melts again

D It hardens and bonds to the previous layer

Each layer hardens and bonds to the layer below, building the object up.

Which of these is NOT a common FDM material?

A PLA

B Resin

C ABS

D PETG

Resin is used in other 3D printing methods, not FDM which uses thermoplastic filaments like PLA, ABS, and PETG.

What is a key advantage of FDM printing?

A Requires no electricity

B Uses metal powders

C No need for molds or cutting

D Prints only flat objects

FDM builds objects layer by layer without molds or cutting, allowing complex shapes.

Explain the basic steps of the FDM process in your own words.

Think about how the printer uses plastic and builds the object from the bottom up.

Describe why FDM is a popular 3D printing method and mention common materials used.

Consider what makes FDM accessible and what materials it uses.

Practice

1. What is the main material used in the FDM (Fused Deposition Modeling) 3D printing process?

easy

A. Plastic filament

B. Metal powder

C. Resin liquid

D. Paper sheets

Solution

1. Step 1: Understand the FDM process basics

   FDM works by melting and extruding plastic filament to build objects layer by layer.

2. Step 2: Identify the material used

   The material fed into the printer is a plastic filament, not metal, resin, or paper.

3. Final Answer:

   Plastic filament -> Option A

4. Quick Check:

   FDM uses plastic filament = Plastic filament [OK]

Hint: FDM melts plastic filament to build layers [OK]

Common Mistakes:

• Confusing FDM with resin-based printing
• Thinking metal powder is used in FDM
• Assuming paper or sheets are involved

2. Which step comes first in the FDM 3D printing workflow?

easy

A. Preparing the digital 3D model

B. Slicing the digital model

C. Printing the object layer by layer

D. Cooling the printed object

Solution

1. Step 1: Review the FDM workflow steps

   The process starts with preparing a digital 3D model before slicing or printing.

2. Step 2: Order the steps logically

   First prepare the model, then slice it, then print, and finally cool the object.

3. Final Answer:

   Preparing the digital 3D model -> Option A

4. Quick Check:

   Model preparation comes before slicing [OK]

Hint: Model must exist before slicing [OK]

Common Mistakes:

• Thinking slicing happens before model preparation
• Assuming printing starts without slicing
• Confusing cooling as an early step

3. If an FDM printer uses a 0.4 mm nozzle and prints layers 0.2 mm thick, how many layers are needed to print a 10 mm tall object?

medium

A. 20 layers

B. 50 layers

C. 40 layers

D. 25 layers

Solution

1. Step 1: Understand layer thickness and object height

   The object height is 10 mm, and each layer is 0.2 mm thick.

2. Step 2: Calculate number of layers

   Divide total height by layer thickness: 10 mm ÷ 0.2 mm = 50 layers.

3. Step 3: Recheck nozzle size relevance

   Nozzle size affects width, not layer height, so it doesn't change layer count.

4. Final Answer:

   50 layers -> Option B

5. Quick Check:

   10 ÷ 0.2 = 50 layers [OK]

Hint: Divide height by layer thickness for layers count [OK]

Common Mistakes:

• Using nozzle size to calculate layers
• Multiplying instead of dividing height by layer thickness
• Confusing layer thickness with nozzle diameter

4. A user notices their FDM print has gaps between layers. What is the most likely cause?

medium

A. Layer height set too small

B. Incorrect filament diameter setting

C. Print bed not leveled

D. Nozzle temperature too low

Solution

1. Step 1: Identify symptoms of gaps between layers

   Gaps usually mean poor bonding between layers, often caused by low extrusion temperature.

2. Step 2: Evaluate each option's effect

   Incorrect filament diameter affects extrusion amount but less likely to cause gaps; bed leveling affects adhesion to bed; layer height too small usually improves quality.

3. Final Answer:

   Nozzle temperature too low -> Option D

4. Quick Check:

   Low temperature causes poor layer bonding [OK]

Hint: Low nozzle temp causes gaps between layers [OK]

Common Mistakes:

• Blaming bed leveling for layer gaps
• Thinking smaller layer height causes gaps
• Ignoring temperature effects on bonding

5. You want to print a custom part with fine details using FDM. Which combination of settings will best improve detail without sacrificing strength?

hard

A. Use a smaller nozzle diameter and maximum layer height

B. Use a larger nozzle diameter and maximum layer height

C. Use a smaller nozzle diameter and moderate layer height

D. Use a larger nozzle diameter and minimum layer height

Solution

1. Step 1: Understand nozzle diameter and layer height effects

   Smaller nozzle diameter allows finer detail; moderate layer height balances detail and strength.

2. Step 2: Evaluate options for detail and strength

   Smaller nozzle with moderate layer height improves detail and maintains strength; large nozzle or max layer height reduces detail.

3. Final Answer:

   Use a smaller nozzle diameter and moderate layer height -> Option C

4. Quick Check:

   Smaller nozzle + moderate layers = better detail + strength [OK]

Hint: Smaller nozzle + moderate layers = fine detail and strength [OK]

Common Mistakes:

• Choosing max layer height which reduces detail
• Using large nozzle which lowers resolution
• Ignoring balance between detail and strength