Certification Test

What is the most common nozzle (hot end) diameter size in FFF.

.4mm

The two standard diameters for Thermoplastic filaments are:

1.75 mm, 3mm

The file format (*.3mf) stands for:

3D manufacturing format

The arrow shown in the picture displays the direction in which shear stress w ill be the highest in the part. What orientation should you print the part in order to keep the part from yielding? Disregard support considerations in this example.

A

The arrow shown in the picture displays the direction in which shear s tress will be t he highest in the part. What orientation should you print the part in order to keep the part from yielding? Disregard support considerations in this example.

B

The acronym FFF stands for:

Fused Filament Fabrication

You require a part to be strong, flexible and to stand up to heat. What material should you use in an FDM printer?

Nylon 618

PVA filament is normally used as a water-soluble synthetic polymer. What is the best way to remove PVA from the part?

Submerge in a bath of cold circulating water.

Why do you need a heated build plate when printing ABS?

The print bed should be kept near the glass transition temperature and well below the melting temperature. It also helps to keep the part from cooling too fast and warping.

3DExpert from Solidworks is a free download.

True

Using the 45 degree rule in FFF technology, if your model doesn't have any overhangs greater that 45 degrees, you should not need support. There are exceptions to the 45 degree rule. The most common ones are straight overhangs, and fully suspended islands.

True

When designing your part for 3D printing, try to use the 45 degree rule. If your model has overhangs greater than 45 degrees, you need support material.

True

Name a few benefits of using a dual extruder in an FFF printer.

ability to print more than a single filament color, ability to print a different support material

When printing ABS, what chemical can you use to smooth the surface?

acetone

___ is often used in post processing when using ABS to provide a smooth glossy finish.

acetone

It is recommended that you store used filament in a:

airtight container and dry, dark, and controlled environment

Identify some of the ways to transport a file for the computer to the 3D printer.

all of the above

One of the most common reasons for a Fused Filament Fabrication (FFF) print failure is build plate adhesion. Identify a few common solutions:

all of the above

A post-curing process is required for FFF technology.

false

ABS in general is more forgiving to large temperature fluctuations and moisture than PLA during a build cycle.

false

In FFF technology, you do not need a heated bed when using ABS.

false

In SLA technology, you have the ability to customize percent infill and infill pattern type for the print.

false

Increasing the number of triangles in an STL file will decrease the overall print time.

false

Increasing the number of triangles in an STL file, will decrease the overall print time.

false

PLA gives off a very strong unpleasant odor.

false

PVA filament is not hygroscopic.

false

The Formlab Form2 SLA printer resin only comes in one color

false

The part displayed is perpendicular to the build plate. The part will not require support material based on the standard support guidelines.

false

Ultimaker 3 uses Near Field Communication (NFC) technology in their filament roll. The NFC technology provides what information to the printer.

filament color, filament type

The creation of advanced part structures is aided by what type of CAD design tool?

generative design

In FFF technology, it's best to monitor the first 3-5 layers when starting a print. Never assume you will have perfect bed adhesion. If there is a bed adhesion issue, check to see if the bed is level. Check the bed and extruder temperatures and then either apply

glue stick, blue painters tape

What is the main advantage of using a heated bed for ABS.

helps the part from cooling too fast and deforming

Formlab Form 2 recommends to wash the part with ___ in the post-cure.

isopropyl alcohol

____ technology is the most common additive manufacturing technology for industrial powder based applications.

sls

ABS is an oil based thermoplastic.

true

Additive manufacturing (*.amf) is a file format that includes the materials that have been applied to the parts or bodies in the 3D model.

true

Additive manufacturing, sometimes known as rapid prototyping, can be slower than subtractive manufacturing. Both take skill in creating the g-code and understanding the machine limitations.

true

All SLA printed parts require a post-cure.

true

An STL file describes a raw unstructured triangulated surface by the unit normal and vertices of the triangles using a three-dimensional Cartesian coordinate system.

true

Avoid using PLA if the print is exposed to temperatures of 60 C or higher or might be bent, twisted or dropped repeatedly. ABS is a better material for this application.

true

FFF technology builds a part that has inherently anisotrophic properties, meaning it is much stronger in the XY direction than the Z direction.

true

For a smoother STL file, change the Resolution to Custom. Change the deviation to 0.0005in (0.01mm.) Change the angle to 5. Smaller deviations and angles produce a smoother file but increase the file size and print time.

true

For high temperature applications, ABS is more suitable than PLA. PLA can rapidly lose its structural integrity as it approaches 60 C.

true

If maximizing strength is an issue, select the part orientation on the build plate so that the "grain" of the print is oriented to maximize the strength of the part.

true

In FFF technology, darker colors and glow in the dark filament materials often require higher extruder temperatures (5C - 10C.)

true

In FFF technology, for a consistent quality build, control the build area and environment temperature. Eliminate all drafts and control air flow that may cause a temperature gradient within the build area.

true

In FFF technology, you have the ability to customize percent infill and infill pattern type to print.

true

In Solidworks for a smoother STL file change the resolution to custom. Change the deviation to 0.0005in (0.01mm.) Change the angle to 5. Smaller deviations and angles produce a smoother file but increase the file size and print time.

true

In general with FFF technology, use a 10% - 15% infill with a maximum infill of 60%. 100% infill is not recommended. Part warping can e a concern.

true

In general, post-processing is the removal of supports and any needed polishing or sanding.

true

Most FFF printers and the Formlab Form 2 printer provide the ability to add material during the print cycle if needed.

true

Most low-end 3D FFF printers use an extruder with Polyether with Ketone (PEEK) or Polytetrafluoroethylene (Teflon.) Both PEEK and PTPE begin to breakdown above 240 C and will burn and emit noxious fumes. Use an all metal hot end about 240 C.

true

Most slicers provide the ability to address rafts and supports.

true

PVA filament is a water-soluble synthetic polymer.

true

Part orientation is important on build strength and the amount of raft and support material required for the build. Incorrect part orientations can lead to poor strength, warping, curling and delamination.

true

Parts with a lower percentage of infill should have a lower internal force between layers and can reduce the change of curling, cracking and layer delamination along with a lower build cost and time.

true

SLA technology is a form of 3D printing in which computer-controlled low-power, highly focused ultraviolet (UV) laser is used to create layers (layer by layer) from a liquid polymer that hardens on contact.

true

SLS technology is the preferred rapid-prototyping method of metals and exotic materials.

true

Scaling parts in the slicer could have a negative effect on the overall wall thickness.

true

Scaling your part in your slicer could have a negative consequence for mating parts.

true

Solidworks Design Guidance functionality produces much more organic and unique geometry than if modeled by the user

true

The Formlab Form 2 machine does not have the ability to remotely monitor the unit using a webcam or camera. They use their dashboard feature.

true

The Formlab Form 2 printer can only print in a single color at a time.

true

The Formlabs Form 2 uses the PreForm Software. PreForm provides the ability to select the One-Click Print option. The One-Click option automatically optimizes the part orientation and support locations.

true

The Formlabs PreForm software only supports STL and OBJ files.

true

The Ultimaker and Formlabs Form 2 provides the ability to add material midway through a print if needed.

true

There are many materials that are being explored for 3D printing; however, the two most dominant plastics for FFF technology are PLA (Polylactic acid) and ABS (Acrylonitrile-Butadiene-Styrene)

true

Thermoplastic filament comes in two standard diameters: 1.75mm and 3 mm (true size of 2.85mm.)

true

To ensure proper post-curing, Formlabs recommends their post-curing unit: Form Cure. Form Cure precisely combines temperature and 405mm light to post-cure parts for peak material performance.

true

Ultimaker Cura - Version 3.1.0 or newer provides the ability to import Solidworks part and assembly files directly into the build area.

true

Unlike its predecessor STL format, Additive Manufacturing Format (*.amf) has native support for color, materials, lattices and constellation (groups.)

true

You are using an SLA machine to print a hollow part. It is very important to design a drain hole at the bottom of the part based on it printing orientation.

true

in FFF technology, the higher the infill percentage, the more material and longer the print time. It will also increase weight and material cost.

true