Process for controlling extrusion speed in 3D printing systems

Patent metadata

Field	Value
Publication number	US-12472692-B2
Application number	US-202318841992-A
Country	US
Kind code	B2
Filing date	Feb 27, 2023
Priority date	Feb 28, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A process for automatically adjusting print speed in a 3D printer, a system for printing a 3D object, and a method of printing a 3D object. A scaling factor is selected, including a first component for print speed and a second component for print quality, an extrusion nozzle port size is identified, and a maximum volumetric extrusion rate for a filament material and a minimum volumetric extrusion rate for the filament material is identified. An optimized volumetric extrusion rate is calculated from the maximum volumetric extrusion rate, the minimum volumetric extrusion rate, and the scaling factor. An optimized X-Y velocity V xy of a print head based on the optimized volumetric extrusion rate is calculated. A computer numerical control code is adjusted to include the optimized X-Y velocity V xy of the print head.

First claim

What is claimed is:

1 . A process of automatically adjusting print speed in a 3D printer, comprising:
selecting a scaling factor, wherein the scaling factor includes a first component for print speed and a second component for print quality; identifying an extrusion nozzle port size; identifying a maximum volumetric extrusion rate for a filament material and a minimum volumetric extrusion rate for the filament material; calculating an optimized volumetric extrusion rate from the maximum volumetric extrusion rate, the minimum volumetric extrusion rate, and the scaling factor; calculating an optimized X-Y velocity V XY of a print head based on the optimized volumetric extrusion rate; and adjusting a computer numerical control code to include the optimized X-Y velocity V XY of the print head, wherein:
the optimized volumetric extrusion rate is calculated from the following:

V
.

E

=

C
1

*

V
.

E
MAX

(

Port
⁢

Size

,
Material

)

+

C
2

*

V
.

E
MIN

(

Port
⁢

Size

,
Material

)

where

C
1

+

C
2

=
1

,

∀

C
1

≥
0

,

C
2

≥
0

C
1

=
α

C
2

=

1
-
α

0
≤
α
≤
1

wherein {dot over (V)} E is the optimized volumetric extrusion rate, {dot over (V)} E MAX is the maximum volumetric extrusion rate for the filament material through the extrusion nozzle port size, {dot over (V)} E MIN is the minimum volumetric extrusion rate for the filament material through the extrusion nozzle port size, a is the scaling factor for print quality, C 1 is the first component of the scaling factor for print speed and C 2 is the second component of the scaling factor for print quality.

2 . The process of claim 1 , wherein the scaling factor is binary.

3 . The process of claim 1 , where the scaling factor is a sliding scaling factor.

4 . The process of claim 1 , wherein the optimized X-Y velocity V XY of the print head is calculated from the following:

V
XY

=

(

V
.

E

)

Width
TRACE

*

Height
TRACE

=

V
E

*
Eratio

V
.

E

=

V
E

*

Area
Filament

Eratio
=

Area
Filament

Width
TRACE

*

Height
TRACE

.

wherein, V xy is the optimized X-Y velocity in either the X or Y direction, Area Filament is the cross-sectional area of the filament, Width TRACE is the width of the printed, extruded filament, Height TRACE is the height of the printed, extruded filament, E ratio is the relation between the Area Filament and the desired trace cross-sectional area, and V E is the linear velocity of the extruder motor.

5 . The process of claim 4 , wherein if the optimized print head velocity V XY exceeds a maximum machine velocity V XY-MAX , then the optimized print head velocity V XY is set at the machine maximum velocity V XY-MAX .

6 . The process of claim 4 , further comprising selecting a nozzle temperature based on the optimized volumetric extrusion rate {dot over (V)} E .

7 . The process of claim 6 , wherein the computer numerical control code is firs

Assignees

• Stratasys Inc

Inventors

• Euan Waldestrand Iris Gisey
• Mijares Tobias Jorge Arturo
• Macneish Iii William Jack

Classifications

• G05B2219/49023

  3-D printing, layer of powder, add drops of binder in layer, new powder · CPC title

• G05B2219/39216

  Motion scaling · CPC title

• G05B19/4099

  Surface or curve machining, making three-dimensional [3D] objects, e.g. desktop manufacturing · CPC title

• B29C64/118 Primary

  using filamentary material being melted, e.g. fused deposition modelling [FDM] · CPC title

• B33Y50/00

  Data acquisition or data processing for additive manufacturing · CPC title