FDM (Fused Deposition Modeling) process in 3D Printing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe the main material used in FDM printing.

3D Printing

FDM printers use [1] as the primary material to create objects.

Drag options to blanks, or click blank then click option'

Aceramic paste

Bthermoplastic filament

Cresin

Dmetal powder

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing FDM with resin-based printing which uses liquid resin.

Thinking metal powder is used in FDM, which is used in other 3D printing methods.

FDM printers work by melting and extruding thermoplastic filament to build objects layer by layer.

2fill in blank

medium

Complete the sentence to explain the basic working principle of FDM.

3D Printing

In FDM, the printer [1] the filament and deposits it layer by layer to form the object.

Drag options to blanks, or click blank then click option'

Amelts

Bcools

Ccuts

Dpaints

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'cools' which is the opposite of what happens to the filament.

Confusing the process with cutting or painting.

The filament is heated until it melts, then extruded to build the object layer by layer.

3fill in blank

hard

Fix the error in the description of the FDM printing process.

3D Printing

The FDM printer uses a laser to [1] the filament and build the object.

Drag options to blanks, or click blank then click option'

Aextrude

Bcut

Cmelt

Dscan

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking FDM uses lasers like some other 3D printing methods.

Confusing 'melt' with the action of the printer nozzle.

FDM printers extrude melted filament through a nozzle; they do not use lasers.

4fill in blank

hard

Fill both blanks to complete the dictionary comprehension describing FDM steps.

3D Printing

fdm_steps = {1: 'Load filament', 2: 'Heat nozzle', 3: [1], 4: [2]

Drag options to blanks, or click blank then click option'

A'Extrude melted filament'

B'Cool layers'

C'Cut filament'

D'Scan object'

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'Cut filament' which is not part of FDM printing steps.

Confusing scanning with FDM process.

After heating the nozzle, the printer extrudes melted filament and then cools the layers to solidify the object.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension describing FDM printer components.

3D Printing

fdm_components = {'extruder': [1], 'build_plate': [2], 'filament': [3]

Drag options to blanks, or click blank then click option'

A'nozzle that melts and deposits material'

B'flat surface where object is built'

C'thermoplastic thread used as material'

D'laser source'

Attempts:

3 left

💡 Hint

Common Mistakes

Selecting 'laser source' which is not part of FDM printers.

Mixing up filament with build plate.

The extruder includes the nozzle that melts filament, the build plate is the flat surface for printing, and filament is the thermoplastic thread used as material.

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