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  • Home
  • Printing Techniques
  • Design Considerations
    • General
    • Ultimaker
    • FormLabs
  • CAD Software
    • Onshape >
      • Basics
      • Sketching
      • Constraints
      • Extrude
      • Revolve
      • Fillet & Chamfer
      • Shell & Draft
      • Direct Editing
    • FreeCAD >
      • Turner's Cube
      • Whiffle Ball
      • Casino Dice
      • Bearing Bracket
      • Fork Bearing
      • Compression Spring
      • Propeller
      • Inner Threads
      • Outer Threads
      • Heart Shaped Ashtray
      • Bird Feeder
      • Ball Bearing
  • Image to STL
    • Medical Images
    • Segmentation
    • Refinement
    • Worked Example: 3D Slicer (Lung)
    • Worked Example: Seg3D (Rib)
    • Completed Examples >
      • Ribs
      • Kidney
      • Brain
  • STL to Print
    • Cura (Ultimaker)
    • Preform (Formlabs)

How to Design Your Object: Formlabs

Minimum Feature Constraints

  • It's a good practice not to design small details in your model close to the limit of your printer. The chances of a failure during printing are increased.
  • PreForm will recognise features as small as 300 microns and features smaller than that won't be visible in your printed model.

Design Specifications

  1. Minimum Supported Wall Thickness - Recommended value: 0.4 mm
  2. Minimum Unsupported Wall Thickness -  Recommended value: 0.6 mm
  3. Maximum Unsupported Overhang Length - Recommended value: 1.0 mm
  4. Minimum Unsupported Overhang Angle - Recommended value: 19° from level
  5. Maximum Horizontal Support Span/Bridge - Recommended value: 21 mm (5 mm width × 3 mm thick)
  6. Minimum Vertical-Wire Diameter - Recommended value: 0.3 mm (7 mm tall) to 1.5 mm (30 mm tall)
  7. Minimum Hole Diameter - Recommended value: 0.5 mm
  8. Minimum Drain Hole Diameter - Recommended value: 3.5 mm diameter
  9. Minimum Embossed Detail - Recommended value: 0.1 mm
  10. Minimum Engraved Detail - Recommended value: 0.4 mm
  11. Minimum Clearance - Recommended value: 0.5 mm

We refer to the FormLabs website at the bottom part of the webpage for more details in the design specifications.
Picture
Adapted From: http://formlabs.com/media/upload/formlabs-design-guide.pdf

Create a Hole to Allow Resin to Escape

PictureFrom: Formlabs.com
  • Some resin might be trapped inside during the printing of hollow objects.
  • Drain a hole to your model to allow the resin to escape.
  • FormLabs suggests a minimum diameter of drain holes of 3 - 3.5 mm.
  • Create a hole by deleting enough faces for the resin to escape during printing.
  • If you create a hole, then your model won't be printed as a solid object. You need to shell it!
  • An easy way is to extrude faces to the inside of the model. Not outside because it will increase your object's dimensions.
  • You could also use the Solidify Modifier from Blender.
  • Don't forget to disable the internal generated supports.

Information from FormLabs Desing Specs and PreForm Webinar.

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