How to Test the Standard PLA

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How to Test the Standard PLA

Standard PLA is the most basic material in the 3D printing industrial because it’s degradable, easy-to-use, and has good surface effect but little string. The standard PLA has not only the largest audience, but also the most abundant colors. PLA in various colors are emerging in endlessly.

3D printer technology and filaments are mutually promoting and improving. An excellent filament can make up for the shortcomings of the printer and determine the lower limit of the printing level. Then let's look at the test of standard PLA.

  

The physical property of standard PLA decides the performances of its prints, including toughness, shrink rate, water absorbency, printing temperature and so on.

Due to the superior properties of raw materials, the water absorption of standard PLA is the lowest among all filaments.

 Standard PLA Parameters

physical properties:

Typical Value:

Method

Peak melt Temperature:

167±5

ISO 11357

Glass Transition Temperature:

55-60

ISO 11357

MFR[g/10min](1)210 / 2.16KG

7-15

ISO 1133

Specific Gravity[g/cm3]

1.24 g/cm³

ISO 1183

moisture absorption 24hr[%](2) : 

250 ppm

/

Heat Deflection Temperature(0,45MPa):

55

ISO 75

Tensile Yield Strength Filament[MPa]:

60

ISO 527-1

The parameters in the above table are measured by professional testing instruments.

Diameter and Tolerance

Diameter and tolerance are the very basic parameters that we must know before our test.

And high precision of filament can make a constant diameter and make filament hardly get clogged. After testing via a micrometer, we know the diameter of Marble filament is 1.75mm with a tolerance ±0.03.

In the production, the diameter of the filament can be set on the precise equipment. However, the equipment with different precision can produce filaments with different diameters. To remove this hassle, we apply the equipment with 1.75±0.03mm high precision. Next, we use micrometer to do a spot check of the precision of produced filaments.

      

Test Object

Standard PLA

Test Contents

Diameter and Tolerance

Time

2020

Testing Tool

Micrometer

Test Method

A test point for every 30cm. There are 12 testing points.

Color

Data 1

Data 2

Data 3

Data 4

Data 5

Data 6

Data 7

Data 8

Data 9

Data 10

Data 11

Data 12

Blue(mm

1.75

1.74

1.75

1.74

1.74

1.75

1.76

1.75

1.75

1.74

1.75

1.76

From the testing data in the table, there are 12 test points for every filament. There is a 30cm distance between the two test points. As is the micrometer shown, the 12 date indicate that the filaments in different colors has reached the high precision 1.75±0.03mm. So standard filament meets the standards of the diameter.

Temperature Property

As we know, PLA filament is user-friendly for our beginners because it’s easy to use. To get a wonderful print, we must make sure that we know the printing temperature well. The printing temperature directly influences the constant diameter and the liquidity of the output filament. For printing temperature, we set the temperature as some points within 190-220.

Test Object

Standard PLA

Time

2020

Test Method

Print at some different temperature points.

Color

195

205

220

Blue

As shown in the table above, the printing temperature points of the PLA filament 195℃, 205 and 220, under which the output filament has a constant diameter, smooth fluidity and little string. Therefore, when the temperature ranges 190-220, the Standard PLA filament can reach a high-quality printing effect.

Matching Rate of Speed and Temperature

The matching rate of speed and temperature is also an factor that affects the printing effect. Also, it reflects how customers get familiar with the slicing of this Standard PLA filament.

We choose 4 temperature points to test. At a certain temperature, we set different printing speed as the print gets higher. In this way, we can find the optimal match of temperature and speed.

Test Object

Standard PLA

Time

2020

Test Method

At a certain temperature, we set different printing speed as the print gets higher.

Pinter Type

Ender 3

prusa i3

CR-10

Thinker SE

ER-20

mega-s

The temperature matches the speed

195℃:≤45mm/s
205
℃:≤55mm/s
215
℃:≤60mm/s

225℃:≤65mm/s

195℃:≤50mm/s
205
℃:≤60mm/s
215
℃:≤65mm/s

225℃:≤75mm/s

195℃:≤45mm/s
205
℃:≤55mm/s
215
℃:≤60mm/s

225℃:≤65mm/s

195℃:≤45mm/s
205
℃:≤50mm/s
215
℃:≤55mm/s

225℃:≤65mm/s

195℃:≤45mm/s
205
℃:≤55mm/s
215
℃:≤65mm/s

225℃:≤75mm/s

195℃:≤45mm/s
205
℃:≤50mm/s
215
℃:≤60mm/s

225℃:≤65mm/s

 

The table above shows the optimum matching rate of speed and temperature on mainstream printers. We can refer to the table above to slice.

For standard PLA, the speed should be lower; in this way, the prints will have smoother surface but less string.

 

The Adhesivity of the Heated Bed

Standard PLA has lower temperature requirements for heated beds. The following are the temperature requirements for common heated beds.

Test Object

Standard PLA

Time

2020

Test Method

Print on the different type of bed to test the sticking temperature

Bed Type

PEI Flexible  Bed Adhesive

Glass Bed

Microporous Coated Glass Bed

PEI Bed Adhesive

Ink-coated Glass Bed

Sticking Temperature

55-65

65-70

60-65

55-65

60-65

We can know from the table that Standard PLA has a high compatibility with the mainstream bed.

Compatibility of 3D Printers

Without a printer, the filament can not produce a print. The compatibility of the printer should also be taken into concern.

Test Object

 Standard PLA

Time

2020

Test Method

Print via mainstream printers

Test Color

Blue

Test Type

Thinker SECR-10Ender 3Mega-sER-20Prusa i3

Result

Within 190-220℃, the above printers can print normally and for the specific recommended parameters, you can refer to the specification.

From the above test process, Standard PLA filament applies to most FDM printers in the market. When you use different printers, the slicing parameters should be different. The retracting length set for Bowden and direct drive printers should be different. That will be given in the product specification and you can refer it.

Retracting and String

Generally speaking, proper retracting value can decrease string rate. After a few times of testing, we get the following data.

With an inconstant printer, we test to find that the optimum retracting value for a certain temperature rang. The standard PLA print in the picture has little strings.

After comprehensive testing of the above projects, we give you reference of parameters—Bowden extruder printer: printing temperature 200-220℃, retracting length 4-7mm, retracting speed 50-70mm/s; direct-drive extruder printer: printing temperature 200-220℃, retracting speed 0.8-1mm, retracting speed 35-40mm/s.

205

In conclusion, the standard PLA is easy to use and compatible with most printers, can adapt to a wide temperature range and has smooth. The extruded filament has constant diameters. In terms of printing habits and usage, Standard PLA is user-friendly.

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