3D Printing Hardware Coursera Quiz Answers – Networking Funda

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Week 01: 3D Printing Hardware Coursera Quiz Answers

Quiz 01: Orientation Quiz

Q1. This course includes ___ modules.

• 3
• 4
• 5
• 6

Q2. I am required to purchase a textbook for this course.

• True
• False

Q3. Which of the following activities is NOT required in each module?

• Watch the lecture videos.
• Pass the practice quizzes.
• Complete the module quizzes.
• Complete the peer reviewed assignments.

Q4. The following tool(s) will help me use the discussion forums:

• Upvoting posts
• Reporting inappropriate posts
• Following a thread
• All of the other options are correct.

Q5. If I have a problem in the course I should:

• Email the instructor
• Call the instructor
• Drop the class
• Report it to the Learner Help Center (if the problem is technical) or to the Content Issues forum (if the problem is an error in the course materials).

Quiz 02: Practice Quiz 1.1

Q1. What kind of 3D printer uses a powder as a material to print with?

• Fused Filament Fabrication
• Fused Deposition Modeling
• Digital Light Projection
• Powder bed Fusion

Q2. This kind of 3D printer uses a liquid to create a 3D object

• Fused Filament Fabrication (FFF)
• Laminated Object Manufacturing (LOM)
• Stereo Lithography (SLA)
• Binder Jetting

Q3. Who started the RepRap movement?

• Adrian Bowyer
• Matt Griffin
• Hideo Kodama
• Scott Crump

Q4. This is the most popular type of desktop 3D printer today.

• Fused Filament Fabrication
• Selective Laser Sintering
• Powder Bed Fusion

Q5. How long has 3D printing been around?

• 5-9 years
• 10-19 years
• 20-29 years
• 30+ years

Q6. 3D printer kits always have excellent directions to assemble.

• True
• False

Q7. FFF 3D printers use what material to print with?

• Filament
• Resin
• Powder
• Sheets

Quiz 03: Practice Quiz 1.2

Q1. What are the key components of an SLA printer?

• Galvanometer
• Hotend
• Build Plate
• B and C
• A and C

Q2. What is the advantage of an SLA printer?

• There is no advantage
• Higher resolution
• Prints need no post processing

Q3. What do you often trade off when considering budget printers?

• Customer support
• Low investment up front
• Advanced features

Q4. Which of these is not a common class of 3D printer?

• Budget
• Tinker
• Workhorse
• Precision

Q5. Where might you find options to 3D print without owning a 3D printer?

• Makerspace
• Library
• Local enthusiast group
• All of the above

Quiz 03:Module 1

Q1. Operator A says that 3D printers can print anything, Operator B says they can only print in specific materials. Which one is correct?

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q2. When considering a kit printer vs a pre-built machine, what considerations should you make in this choice that are critical in the comparison?

• How much time it takes to build the kit
• What kind of motion system they use
• Shipping Costs
• What filament size the machine uses

Q3. According to the lectures, which of these is a critical point to consider when looking to purchase a machine for professional/institution use?

• Is it the best price
• Will the machine be fast enough for my needs
• Will the company be around to provide support in the future
• Type of motion system

Q4. Person A says that the RepRap movement is largely the reason we have desktop 3D printers today, Person B says, desktop 3D printers were developed by large companies to enter new markets.

• Person A
• Person B
• Both Person A and B
• Neither

Q5. Operator A says budget 3D printers are the best option for cost, Operator B says Budget 3D printers have limitations and often don’t offer any typeof troubleshooting or support.

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q6. Select the components of a 3D printer that allow it to create a part.

• Build Platform
• Tool Head
• Spindle
• Vice

Q7. Operator A says, building a kit 3D printer is an excellent choice because when you build it you learn the ins and outs of the machine and it can be easier to work with, Operator B says professional desktop machines are an excellent choice because they provide documentation and support to troubleshoot issues with.

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q8. What is a reason why 3D printing has not become ubiquitous in the world today?

• Not enough 3D printable files available
• Mass market didn’t all have the needs
• Media hype slowed and people lost interest
• Printers do not work well

Q9. What opportunities do service bureaus offer that most 3D printing users not have the ability to do

• Exotic Materials
• Large build volumes
• Lower cost
• A and B
• B and C
• A and C

Q10. Which of these terms are synonymous with one another?

• Fused Deposition Modeling (FDM) and Fused Filament Fabrication (FFF)
• Stereolithography (SLA) and Digital Light Projection (DLP)
• Laminate Object Manufacturing (LOM) and Binder Jetting

Week 02: 3D Printing Hardware Coursera Quiz Answers

Quiz 02: Practice Quiz 2.1

Q1. Which of the following is not one of the subsystems discussed in this module?

• Motion Mechanical
• Extrusion
• Control
• Filament

Q2. The interactive interface is used to do what type of actions?

• Slice the file for printing
• Select processes on the printer
• Control the stepper motors
• Design parts

Q3. Desktop 3D printers are as simple to operate as a standard color paper printer

• True
• False

Quiz 02: Practice Quiz 2.2

Q1. What are some of the importance areas to familiarize yourself with in your interactive interface?

• How to cancel a print
• How to start a print
• How to calibrate the printer
• All of the above

Q2. What are some of the more modern 3D printers using for displays?

• Tethered computer
• Digital screen and on panel buttons/dials
• Touchscreen
• VR/AR control

Q3. What is firmware?

• The microcontroller that runs the machine
• The software that lives in the microcontroller that controls the system
• The interactive interface menu system
• The files that you send to the printer via USB or SD car

Quiz 02: Practice Quiz 2.

Q1. What is the standard coordinate system used in 3D printing?

Q2. What is the main purpose of the endstops?

• Polar
• Cartesian
• Rectanguloid
• Delta

• To tell the printer it needs maintenance
• Provide a physical spot that the machine cannot move beyond
• Establish an initial position (home)
• Tell the interactive interface that it is able to use specific menu

Q3. What kind of print bed has the ability to print any size object in 1 direction?

• Circular
• Rectangular
• Belted
• Replaceable

Quiz 03: Module 2 Quiz

Q1. What menu option is the most logical to use when a print is failing?

• Maintenance
• Print
• Abort Print
• Tune

Q2. A 3D Printer controller board will take inputs from which sensors in order to control the motion system?

• Endstops
• Thermistor
• Filament Detection
• XYZ Stepper Motor

Q3. When the Control System is sending signals to the rest of the machine to begin a print, why doesn’t the machine just turn the heater on permanently til temp is reached?

• So the filament won’t overheat
• So the printer can warm up
• To allow the sensor data to provide feedback while heating
• All of the above

Q4. Operator A says PID controls are used to provide feedback to the printer so it can monitor itself while printing.  Operator B says you can tune PID controls on a printer if you want to work with new materials.  Which is correct? 

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q5. Operator A says the firmware is the software that interprets the gcode and gives instruction to the printer, Operator B says most 3D printers today operate on 32 bit processors to keep up with the demands of high speed printing. Which is correct?

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q6. Which of the following is what processes the gcode into coordinate values?

• MCU
• Hotend
• Stepper Motor
• All of the above

Q7. What shape is a delta printers build envelope?

• Cylinder
• Rectanguloid
• Spherical
• Prism

Q8. Operator A says the build envelope is smaller than the interior of the machine because manufacturers want to limit your part size.  Operator B says its because they have to compensate for the motion systems physical size.  Which is correct?

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q9. How does the firmware compensate for the type of machine you use (cartesian, delta, polar, etc)?

• It doesn’t, they all operate the same
• It estimates the changes from machine to machine
• It uses an algorithm to change gcode into the appropriate steps of the motor
• It changes the way the motor reads steps to accommodate the type of printer

Q10. Which of these are outputs that the control system operates?

• Hotend fan
• Y Stepper Motor
• Endstop
• A and B
• A and C
• B and C

Week 03: 3D Printing Hardware Coursera Quiz Answers

Quiz 01: Practice Quiz 3.1

Q1. What type of extrusion system uses a stepper motor housed on the tool head?

• Direct Drive
• Bowden
• Delta
• Beta

Q2. The Hot End contains the following things

• Hot Zone
• Cold Zone
• Heatbreak
• Nozzle
• All of the above

Q3. The PID loop in the hotend controls what?

• The moderation of temperature
• The Performance Initializer Dongle
• The heated bed temperature
• The difference between the heated bed and the hotend temperature range

Q4. What is the most common nozzle size and material in 3D printing?

• 4mm Titanium
• .4mm Steel
• .04mm Copper
• .4mm Brass

Q5. Why is active cooling important in 3D printing?

• It isn’t, you want to print hot and keep parts hot until print is complete
• It allows certain materials to quickly stabilize and hold their position in a 3D space
• It allows printing without support in any part
• It isn’t, the naturally cooling of materials is enough to do the work

Q6. What feature of a build plate is most commonly used and versatile in desktop 3D printing?

• Heated Build Plate
• Flexible Build Plate
• Infinite Build Plate
• None of the above

Quiz 02 : Practice Quiz 3.2

Q1. What is the most commonly used material in desktop 3D printing?

• ABS
• PETG
• PLA
• TPU

Q2. What types of plastics are not used in desktop 3D printing?

• Crystalline
• Semi Crystalline
• Thermoplastic
• Thermoset
• All of the above

Q3. What are some considerations for 3D printing equipment when looking to print Polycarbonate or Nylon?

• Drybox
• Open Air printer
• Material the nozzle is made of
• All of the above
• None of the above

Quiz 03 : Module 3 Quiz

Q1. What advantage does a Bowden extrusion system have over direct drive?

• Lower mass on the tool head
• Improved force on the filament
• Improved grip on the filament
• None, Bowdens are inferior to direct drive

Q2. Operator A says the hotend is going to heat up the filament above the glass transition temperature of the material.  Operator B says the hotend is going to heat it up to the melting point of the material. 

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q3. The purpose of the heat break is to

• Prevent the filament from overheating
• Allow the hotend to heat up quickly
• Prevent heat creep into the cold end
• All of the above

Q4. Why would anyone consider using a larger nozzle size than the standard .4mm

• Gain more detail in the small features
• Print faster
• Print new materials
• All of the above

Q5. When considering materials you are printing with, why is active cooling not always used? 

• Some materials warp from cooling
• Some materials are printed cold
• Both A and B
• Neither

Q6. Why is build plate  surface preparation and materials so important for desktop 3D printing?

• All materials act the same when printed so being consistent is key
• The part being printed needs to stay firmly planted on the build plate
• The build plate moves and allows for possible misalignment
• None of the above

Q7. What material is best suited for mechanical functional parts on a non-enclosed printer?

• PLA
• PETG
• PolyCarbonate
• Woodfilled

Q8. User A says that PLA is perfectly fine to use in a hot environment. User B says it would be better to use PETG or ABS.  Which user is correct? 

• User A
• User B
• Both User A and B
• Neither

Q9. If you were to make a part that had to be very durable and strong what material would be the best option? 

• PLA
• PETG
• Nylon
• Woodfill

Q10. User A says using a larger nozzle like .6mm would make your prints take less time. User B says using a .6mm nozzle would give your model less detail.  Which user is correct?

• User A
• User B
• Both User A and B
• Neither

Week 04: 3D Printing Hardware Coursera Quiz Answers

Quiz 01 : Practice Quiz 4.1

Q1. After a digital design is created, what is the next step in the process before you can print it?

• Put the digital design into a slicer
• Export a mesh file
• Select the print menu on your printer
• File must be authenticated

Q2. Which of the following best describes a mesh file?

• A file that describes the surface geometry of an object by using polygons to represent the surfaces
• A file that is full of holes so the slicer knows where to place material
• A file that dictates where to not place material so the printer makes the appropriate part
• The file generated in CAD software like Fusion 360 or Blender

Q3. What type of file format should I export if I want to print a multi-color object?

• STL
• OBJ
• DOCX
• JPEG

Quiz 02 : Practice Quiz 4.2

Q1. Which of these is the most commonly used and largest database of downloadable 3D models? 

• My3DParts
• Thingiverse
• Youmagine
• Pinshape

Q2. Which is the most logical progression of a digital file?

• Model>Slice>Job File 
• Model>Export>Slice>Job File
• Export>Model>Job File
• Model>Job File

Q3. Which type of mesh file contains surface geometry and color data for printing in a single file?

• STL
• STEP
• OBJ
• Color printing is not possible

Quiz 03 : Module 4 Quiz

Q1. Which of these is a repository for finding 3D printable models? 

• TinkerCAD
• Fabbaloo
• Google
• Youmagine

Q2. Why don’t unsupported overhangs print well?

• Without support the molten plastic will droop
• Supports are not required ever, the print will be fine
• The plastic will cool rapidly and shrink disproportionately 
• Unsupported overhangs are not possible printers always print them 

Q3. User A says a Job File will only provide instructions to the printer on what to do, User B says that a Job File is only produced by using a slicing software.  Which of these two users is correct?

• User A 
• User B
• Both User A and B
• Neither

Q4. What must you do with a 3D scanned file to 3D print it? 

• Nothing, the file is already printable 
• Translate the file into a mech surface geometry file 
• Blend the file so it is smooth
• 3D scans are not printable

Q5. If you download a file from Thingiverse, what is the next step you would take to 3D print it? 

• Import it into CAD software
• Import it into a slicer
• Put the file onto an SD card and print it
• Print directly from Thingiverse

Q6. Operator A says a Multi color desktop printer can use an OBJ file to print with multiple colors, Operator B says a multi color desktop printer uses multiple STL files.  Which Operator is correct? 

• Operator A
• Operator B
• Both Operator A and B
• Neither

Q7. When a digital design is being created what considerations should you be thinking about for 3D printing? 

• Strength in the XY plane
• Overhangs
• Printing speed
• All of the above

Q8. What does the job file have to do with the subsystems of a 3D printer? 

• The job file has nothing to do with the subsystems
• The job file and slicer both talk to the printer to tell it what to do
• The job file tells the printer subsystems what to do 
• The job file is run in the firmware so it is a part of the printer 

Q9. Which change in the slicer will lower the time to print an object the most? 

• Changing infill from triangle to gyroid 
• Lowering the infill from 20% to 10% 
• Increasing the layer height from .1 to .2  
• All changes have equal impact on speed of printing 

Q10. What impact does infill type and percent have on a print?

• More infill means the part will be stronger
• More infill means it will print slower
• Infill type can make a part stronger or weaker 
• All of the above 

Week 05: 3D Printing Hardware Coursera Quiz Answers

Quiz 01 : Practice Quiz 5.1

Q1. Why is keeping the box from the printer a good idea? 

• Easier to ship it back if there is a defect 
• Easier to store the printer when not in use
• Acts as a good table for the printer to rest on 
• There is no need just recycle it 

Q2. Which of these is not a common 1st time print challenges? 

• Poorly oriented model 
• Poor bed leveling
• Bad gcode
• Print needed supports 

Q3. What is the “hello world” print? 

• The pre-prepared file that is saved on your SD card
• A print that says the words “Hello World” 
• The programming language that you work to generate a part 
• The firmware’s first command 

Quiz 02 : Practice Quiz 5.2

Q1. Which is not a type of bed leveling system? 

• Inductive Leveling
• Capacitive Leveling 
• Manual Leveling
• Self Leveling 

Q2. Which is the most common type of leveling system on a 3D printer? 

• Force Sensitive Resistor 
• Manual Leveling 
• Accelerometer 
• Self Leveling 

Q3. Why is having a routine checklist important? 

• Lowers risk of a failed print 
• Lowers the need for maintenance 
• Improves print speed 
• All of the above 

Quiz 03 : Module 5 Quiz

Q1. Operator A says that 3D printer bearings don’t have any excessive load so they don’t need to be lubricated aside from when the factory does it.  Operator B says you should lubricate rails every month to properly maintain the machine.  Who is correct? 

• Operator A 
• Operator B 
• Both Operator A and B 
• Neither

Q2. What is the most common failure that a new 3D printer user and machine might experience? 

1 point

• Printer stops working ½ way through the print 
• Hotend won’t heat up 
• Parts won’t stick to the build plate 
• Won’t extrude material 

Q3. What is the most logical thing to do before starting a long print? 

• Make sure was not used before 
• Make sure there is enough filament 
• Replace the nozzle 
• Turn off all other devices in the room 

Q4. When you see this, what does that mean for the nozzle to build plate distance?

• The nozzle is too close to the build plate 
• The nozzle is too far from the build plate 
• The nozzle is perfect in relation to the build plate. 
• The nozzle started too close but then moved too far. 

Q5. If your bed leveling is not correct, what implications can that have on the part you are building? 

• Inaccurate tolerances 
• Part comes loose from the bed 
• Difficulty removing the part from the bed after printing 
• All of the above 

Q6. When you hear popping sounds when printing what is this an indication of?

• The hotend is too hot
• The bed is not level 
• The slicer output bad gcode 
• The filament has too much moisture 

Q7. Which is true about storing filament properly? 

• It can be stored anywhere in open space 
• It depends on the material 
• It should be stored it in a ziplock bag with desiccant 
• It should be stored with similar materials 

Q8. After prolonged use what is a common item to check to ensure proper printing? 

• Belt tension 
• Moisture in the air 
• Ambient temperatures 
• How many files are stored on an SD card 

Q9. If you print the “hello world” print and the part fails on a brand new printer, which is likely the culprit? 

• The printer is defective 
• The bed is not properly leveled 
• The filament is bad 
• The user pressed the wrong buttons 

Q10. Operator A says when printing you should always watch a printer since they often fail randomly, Operator B says if the first few layers are successful the chances of a successful print are high.  Which is correct?

• Operator A 
• Operator B 
• Both Operator A and B 
• Neither

Week 06: 3D Printing Hardware Coursera Quiz Answers

Quiz 01 : Practice Quiz 6.1

Q1. After starting a print it is best practice to. 

• Wait till it finishes heating up and purges 
• Walk away and check in on the print once in a while 
• Watch the first layer 
• Watch the whole print in person or via webcam 

Q2. When prints are finished for functional use what would be an appropriate measure of success? 

• Uniform color 
• Accuracy of the part 
• Ease of support removal 
• None of the above 

Q3. After the print is done and you have removed your part you should 

• Leave the printer in its current state so the next user knows it is available
• Clear off any remnants of printed material from the build plate 
• Run a calibration to ensure bed leveling is proper for the next user 
• Turn the machine off before it finishes cooling off 

Quiz 02 : Practice Quiz 6.2

Q1. When sanding a part to achieve a high quality finish, you should 

• Use a palm sander
• Use a dremel tool 
• Use a belt sander 
• Hand sand 

Q2. Sanding parts to a very smooth finish should 

• Be done to every part printed 
• Start with dry sanding and end with wet sanding
• Be done in a clean room
• Be done with a power tool

Q3. Assembly of printed parts can be done by using 

• Glue
• Epoxy
• Fasteners
• Snap Fits
• All of the above 
• None of the above

Quiz 03 : Module 6 Quiz

Q1. If the first layer is sparsely printing what is the best course of action? 

• Continue printing
• Pause the print and take a closer look
• Cancel the print 
• Increase nozzle temperatures 

Q2. When a part is complete and you are inspecting it, what could be a potential issue if you find the part has warped from the print bed? 

• The material had too much moisture 
• The bed was not properly level 
• The bed was not properly prepped
• A and B 
• B and C 
• A and C 

Q3. Before starting a new print what should you check pertaining to the build surface? 

• It is free from previous print material 
• It is properly prepped with glue or other surface treatments if needed 
• It is properly secured in place 
• All of the above 
• None of the above 

Q4. Why should you keep sanding speeds low when finishing a 3D printed part? 

• To allow the plastic to fill in the gaps 
• To reduce the heat in the part 
• To prevent the material from changing color 
• To keep the area more clean 

Q5. When finishing a 3D printed part, what is the recommended finishing grit sandpaper? 

• 80 grit 
• 120 grit 
• 500 grit 
• 1000 grit 

Q6. Operator A says you can use Super Glue on any printed part. Operator B says some materials don’t bond well with Super Glue and you should use epoxy resins instead.  Which operator is correct? 

• Operator A 
• Operator B 
• Both Operator A and B 
• Neither

Q7. What are common modifications to a 3D printer to help print large structures quickly? 

• Enclosure
• Updated Slicer 
• Larger Nozzle 
• Flexible print surface 

Q8. Operator A runs a printing service with 50 printers.  They have to lubricate the bearings once every 2 weeks on a routine schedule.  Operator B runs a single printer at home for 20 hours a week and they say they lubricate their bearings every month.  Who has the correct approach? 

• Operator A 
• Operator B 
• Both Operator A and B 
• Neither

Q9. What is the most appropriate location to find information on how to take apart your printers extruder? 

• The manufacturers website
• A web search 
• Group forum
• A mechanical engineer 

Q10. Operator A is having difficulty printing with nylon. They say the prints warp frequently.  Operator B has perfect nylon prints and they say they just added a larger nozzle, an enclosure, and a new extruder to their machine.  Which modification has made the most significant impact on printing nylon for Operator B? 

• Larger nozzle 
• Enclosure
• New extruder 
• None it was done in the slicer 

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