• How Do I Set Up the Printing Parameters

Another key part of learning the printing process is to understand how to set the printing parameters within in the Kudo3D software. There is no “one-fits-all” parameter number that can be duplicated for any type of resin or with any type of 3D design. This being said, the printing parameters will differ every time you have a new resin or have a very different model. However, rest assured! There is a general guideline that you can follow in successfully creating the ideal printing parameter for each print.

To start off, it is important to understand how the Kudo3D Titan 1 and Titan 2 work. Both printers come with an US patented passive self-peeling technology. The cured layer is peeled away from the resin container, without an additional actuator, when the build platform is lifted. Please refer to our PSP blog to better understand how the PSP works: http://www.kudo3d.com/understanding-kudo3d-psp-resin-container/

There are 5 parameters that you may need to adjust for the layers to speed up the printing process or to improve the print quality. Let’s discuss the impact of these parameters on your print. Afterwards, we will break it down the steps and provide a guideline regarding how to setup these parameters.

  1. Exposure time: Exposure time has an impact on the resolution, the hardness of the cured material, and the adhesion between the cured layer and the Teflon film. The normal exposure time depends on the resin being used and the layer thickness. Please note that the normal exposure time could drift away due to the aging of the projector lamp or the resin. To identify the normal exposure time, please refer to the article in http://www.kudo3d.com/understanding-kudo3d-high-resolution-calibration-model/

     

  2. Lifting height: The platform must be lifted to a height that gives enough time for peeling process to be completed. This number depends on viscosity of resin, adhesion between the cured layer and the Teflon film, lifting speed, exposed area, exposed pattern, and builds platform area.

     

  3. Lifting speed: This number usually depends on the strength of your material and the adhesion between the cured layers. The separation force is higher when the lifting speed is higher. If the material is not strong, a high lifting speed may break the model. If the adhesion between the cured layers is not strong, a high lifting speed may tear the model apart.

     

  4. Lowering speed: This number has an impact on very fine and weak structure. When the model is lowered at a high speed, the pressure exerted from the liquid resin will also be higher. If the structure is weak, this pressure could temporarily or permanently move the printed model in a micro scale. As a result, you could see more abrupt layer interfaces under the microscope. Sometimes, fine structures could also be distorted. When the viscosity of the resin is higher, the pressure is higher, meaning that you may need to slow down the speed even further.

     

  5. Delay: When the platform is lowered in the resin, it will push the resin away. “Delay” is the time required to stabilize the resin. When the viscosity is higher, it takes more time to stabilize the resin.

     

In general, for each model, we can separate the layer zones into two sections. The first section involves both vacuum force and the adhesion force. The second section usually only involves adhesion (unless the cured layer has a large area). The following guideline is a rule of thumb for setting up the printing parameters. You can tune it up after gaining more experience.

First Section: (first 2mm for small build plate and 4mm for large build plate)

First zone

First layer only- This layer is called attachment layer, which is part of the base and the most important layer.

Exposure time

  • 10 to 20 times the normal exposure time to make sure that any potential gap between the build platform and vat floor is fully cured and the first layer is attached to the platform firmly.

Lifting height

  • Large build platform: 7 mm
  • Small build platform: 5 mm

Lifting speed

  • 10 mm/min

Second zone

Rest of the base layers- Normally, the base layers includes all the layers before the supports. The total thickness of base should be thinner than 0.3 mm.

Exposure time

  • 5 times the normal exposure time defined with the calibration sample

Number of layers

  • Depends on the thickness of the layers and base
  • For example, if the base is 0.3mm and the layer thickness is 0.05mm, then you have 5 or 6 layers for the base.

Lifting height

  • Large build platform: 7 mm
  • Small build platform: 5 mm

Lifting speed

  • 10 mm/min

Third zone

The rest of the layers that make up the first 4mm of a model using large platform or the first 2mm using small platform. This zone has the vacuum force influence. Please note that if your z-zero sinks below the Teflon film, the number of layers in the vacuum force section should include the number of layers that brings the platform from z-zero to the actual vat floor.

Normally, this zone contains only supports. This is part of the foundation so it must be strong and stable. You can adjust the number of layers accordingly depending on whether the resin viscosity is higher or lower.

Exposure time

  • Half of the second zone

Number of layers

  • For example, if the layer thickness is 0.05mm then you have 40 layers for the first 2 mm of printing with a small build platform. If the base consists of 6 layers, the remaining 34 layers will be assigned to this zone.

Lifting height

  • Large build platform: 5 mm
  • Small build platform: 3.5 mm

Lifting speed

  • 15 mm/min

Second Section:

Fourth zone

This zone normally contains layers for supports plus a few layers of the model to make sure that the adhesion for the tips is strong. This zone is also part of the foundation.

Exposure time

  • Same as the third zone
  • If the model has supports close to the securing aluminum bar, you need to increase the exposure time about 2 times.

Lifting height

  • 3.5 mm

Lifting speed

  • 15 mm/min
  • If the bottom of the model has a flat surface and the model is not rotated, the first few layers that attaches to the support tips usually has a larger area. Since the separation force is higher for large exposed areas, you might want to slow down to avoid the tips breaking off.

Fifth zone to Seventh zone

Layers for both supports and model

Exposure time

  • Gradually lower the exposure time from the 5th to 7th zone to avoid horizontal lines caused by non-uniform layer shrinkage.

Lifting height

  • Ranges from 2mm to 5mm, depending on the exposed area

Lifting speed

  • 15 mm/min

Eighth zone and more

Layers for model only. These layers consist of purely model slices.

Exposure time

  • Normal exposure time

Lifting height

  • Ranges from 2mm to 5mm, depending on the exposed area.

Lifting speed

  • 15 mm/min

This provides the basic overview of how to set up the printing parameters within the Kudo3D software. As mentioned before, there is no “one solution that fits all” for any type of resin or model. Being said, the best method to understand how to set parameters is to have as much practice and experience as possible. Once you understand how the numbers are set and why they are set as so, you will have a much easier time in creating parameters for different types of models!

2017-12-20T07:43:20+00:00

8 Comments

  1. Miguel December 19, 2017 at 3:44 pm - Reply

    Hi,

    When you refer to large and small areas exposed, which would be the limit between both types of ares?

    • Kudo3D Tech Support February 26, 2018 at 5:59 am - Reply

      Small means miniatures or any models smaller than that. A cube of an inch is not small as the cross sectional area is large enough to warp the Teflon film. Therefore, soft containers are usually for small and high resolution models.
      Small and large is more determined by the exposed cross sectional area.

  2. Ana October 7, 2018 at 7:18 am - Reply

    Thanks you so much. Good quality work. Go ahead.

    • Kudo3D Tech Support April 11, 2019 at 6:06 pm - Reply

      Thank you for your comment. We are working hard to make resin printers better, especially for high resolution and precision.

  3. Max October 26, 2018 at 2:22 pm - Reply

    Is it possible to tweak variables like exposure time and active pixels to have multiple resolutions within one layer in the XY plane?

    • Kudo3D Tech Support April 11, 2019 at 5:50 pm - Reply

      You can use grey scale to change the intensity of light instead of the exposure time. However, not sure if there is a slicer that can do this.

  4. Barry Miller February 10, 2019 at 6:31 pm - Reply

    So my basic question as a beginner (new Bean owner), is how do we determine the “Normal Exposure Time” for each resin and layer height? As it is now, I’m merely using the exposure times shown in the basic parameter data for each 3DSR resin. But I’m sure there’s a better way, as for instance i THINK those are for 50 micron layers. So of course adjustments need to be made for thinner and thicker layers.

    And that’s where it gets experimental (and expensive / time consuming). Is there a “one stop shopping” source which provides normal exposure times for each resin at varying layer heights?

    Thanks!

    • Kudo3D Tech Support April 11, 2019 at 5:46 pm - Reply

      Please visit the blog for the article about our calibration sample.

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3Dプリンターを使いこなせるカギとなることは、パラメーターの設定です。パラメーターはレジンとモデルのデザインによってみんな違いますので、Kudo3Dの制御ソフトではユーザーは自由にパラメーターを設定できます。

3Dプリンター初心者で設定がわからないお客様でも簡単に設定できるよう、説明します!

さて、まずはKudo3DのTitanシリーズ(Titan 1、Titan 2及びTitan 2 HR)の作動原理について理解しましょう。Titanシリーズの3Dプリンターは、アメリカの特許技術~受動自己剥離(PSP: Passive Self-Peeling)技術~で開発しました。

硬化した積層は、外部の部品に一切依頼せず、ビルドプラットフォームが上がる際に自らレジンから剥がれます。PSPレジン容器に関しては詳しく、こちらのブログ記事にご参照ください:
http://www.kudo3d.com/understanding-kudo3d-psp-resin-container/?lang=ja

出力速度を上げることや表面出来上がりをよくするためには、5つのパラメーター値の設定が必要です。まずは、それらのパラメーターの意味について説明しましょう。

  1. 露光時間(或いは照射時間、Exposure time) 露光時間は、解像度、成型物の硬さと、硬化層とテフロンシートの粘着力に関係しています。通常の露光時間ご利用のレジンと積層ピッチによって変わります。また、プロジェクターの電球またはレジンの老化にも影響されます。

    通常露光時間を確認するには、こちらのブログ記事にご参考ください。
    http://www.kudo3d.com/understanding-kudo3d-high-resolution-calibration-model/?lang=ja

     

  2. リフト量(Lifting height) 硬化した積層を剥離させるには、プラットフォームを上げることが必要です。上げる高さはレジンの粘度、硬化層とテフロンシートの粘着力、リフト速度、露光面積、成型パターンとビルドプラットフォームのサイズに影響されています。

     

  3. リフト速度(Lifting speed) レジンの強度と硬化した積層の粘着力に影響されています。リフト速度が高ければ高いほど、分離力が高いです。レジンが強度が足らず、リフト速度が高い場合、造形を壊す可能性があります。積層の粘着力が低く、リフト速度が高い場合、造形の積層を無理やり剝せる可能性があります。

     

  4. 下降速度(Lowering speed) このパラメーターは、細かいデテールや構造が弱い造形に対してとても重要です。高い速度でビルドプラットフォームを下げると、液体のレジンから出される圧力が高くなり、構造が弱い造形を少し動かせてまいます。細かいデテールはうまく出力できないかもしれません。レジンの粘度が高ければ高いほど、圧力が高い為、速度をもっと下げた方がおススメです。

     

  5. 遅延時間(Delay) ビルドプラットフォームがレジン容器に降りる時、容器に入っているレジンを軽く押しつけます。「遅延時間」は液体のレジンが安定するまでの余裕時間です。レジンの粘度が高い場合、安定するまでかかる時間が長くなります。

     

一般的に言えば、造形のレイヤーは2つのセッションに区分できます。1つ目は、真空力と粘着力が関わっています。2つ目は、硬化層の面積が大きくない限り、普通は粘着力しかありません。

下記の推奨露光時間はあくまでも参考用の目安です。お客様の造形に合わせて調整してくださいね。

セクション1:
小型ビルドプラットフォーム:最初の2mm
大型ビルドプラットフォーム:最初の4mm

ゾーン1

第1層のみ-アタッチメント用の積層でベースとして一番重要なゾーンです。

露光時間

  • • ビルドプラットフォームとレジン容器の間の隙間にレジンで埋めるよう、通常露光時間の10~20倍以上かかります。

リフト量

  • 大型ビルドプラットフォーム:7 mm
  • 小型ビルドプラットフォーム:5 mm

リフト速度

  • 10 mm/min

ゾーン2

残りのベース積層-サポートを出力する前の積層が含まれています。厚さは0.3mm以下です。

露光時間

  • 通常露光時間の5倍

積層数

  • 積層ピッチとベースの厚さによる
  • 例:バースが0.3mm、積層ピッチが0.05mmの場合、ベースのレイヤー数は、5~6枚

リフト量

  • 大型ビルドプラットフォーム:7 mm
  • 小型ビルドプラットフォーム:5 mm

リフト速度

  • 10 mm/min

ゾーン3

造形物最初の4mm(大型ビルドプラットフォーム)/2mm(小型ビルドプラットフォーム)を構成する積層。このゾーンは真空力が一番強いゾーン。Z軸の0位置がテフロンシートより低い位置で設置された場合、その0の位置とテフロンシートの間の積層はゾーン3に入る。

普通、このゾーンにはサポートのみ含まれている。強度と安定性が必要。 また、レジンの粘度によって積層数をお決めください。

露光時間

  • ゾーン2の半分

積層数

  • 例えば、積層ピッチが0.05mmで、小型ビルドプラットフォームを使い、最初の2mmの造形は積層40枚(2/0.05)。ベースが積層6枚ある場合、残りの34枚はゾーン3になります。

リフト量

  • 大型ビルドプラットフォーム:5mm
  • 小型ビルドプラットフォーム:3.5mm

リフト速度

  • 15 mm/min

セクション2:

ゾーン4

このゾーンは、サポートの先端部分がしっかりと造形本体に接着することを確認する為に、サポートと造形最初の積層が含まれています。

露光時間

  • ゾーン3と同じ
  • 造形のサポートがレジン容器を固定するメタル棒に近い場合、露光時間を2倍ぐらい延ばしてください。

リフト量

  • 3.5 mm

リフト速度

  • 15 mm/min
  • 造形の底部が平面で、造形の向きが斜めではない場合、サポートの先端と造形の接着レイヤーは露光面積が大きい為、リフト速度を落とすことがおススメ。

ゾーン5~7

サポートと造形本体

露光時間

  • 一気に露光時間を短くすると、レイヤーの不平均な収縮で造形に横線が入ってしまうので、ゾーン5~7では、露光時間を少しずつ落とす。

リフト量

  • 露光面積によって2mm~5mmの間に設定

リフト速度

  • 15 mm/min

ゾーン8以降

造形本体のみの積層。

露光時間

  • 基本露光時間

リフト量

  • 露光面積によって2mm~5mmの間に設定

リフト速度

  • 15 mm/min

以上、出力パラメーター値の設定の掟です。しかし、ご利用のレジンと造形のデザインによってパラメーターが違いますので、経験を積んで一番出力しやすいパラメーター値を見つけた方がいいでしょう。パラメーター設定の理屈を身に着けば設定もどんどん簡単になります!

2019-01-23T08:55:47+00:00

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