HOW TO USE TREE (ORGANIC) SUPPORTS

Traditional supports are vertical columns of infill that touch the model along their full top surface. Tree supports start as a thick trunk at the bed and branch outward like a tree to touch the model only where geometry actually needs holding up. Modern 'organic' supports are an even smarter version - they curve around model features and use the minimum branching topology to support the print. The practical wins: 30-50% less filament than traditional supports for the same geometry, dramatically less surface marking on the model, and faster removal because the contact area is small. The trade-off: longer slice time and slightly less stability for very tall thin supports.

Use tree / organic supports when: the model has visible top surfaces that need supports (display pieces), geometry has complex overhanging features that traditional grid supports would mark heavily, or you want to minimize support filament usage. Don't use tree supports when: supports are tall and thin (>50 mm) on a wide flat overhang - traditional grid patterns are more stable. Or when slice time matters and the model is complex - tree generation can take minutes longer than grid.

Cura (Tree Supports): - Support - Support Structure: Tree. - Tree Support Branch Angle: 40 degrees. - Tree Support Branch Distance: 1 mm. - Tree Support Branch Diameter: 2 mm. - Top Z-Distance: 0.2 mm (PLA) / 0.3 mm (PETG). - Enable Support Interface, 2 layers, Concentric. PrusaSlicer (Organic Supports - 2.6+): - Support material - Style: Organic. - Top contact Z distance: 0.2 mm (PLA) / 0.25 mm (PETG). - Top interface layers: 2. - Pattern: Concentric. - Branch diameter: 2 mm. - Tip diameter: 0.8 mm (smaller = less scarring). OrcaSlicer / Bambu Studio (Tree Supports): - Support - Type: Tree (auto). - Support style: Tree (Organic). - Top Z distance: 0.2 mm (PLA) / 0.25-0.3 mm (PETG). - Top interface layers: 2-3, Concentric pattern. - Tree branch angle: 40 degrees. - Tree branch diameter: 2-2.5 mm. - Tip diameter: 0.5-0.8 mm. General tuning tips: - Smaller tip diameter (0.5-0.8 mm) = less scarring but less support stability. Start at 0.8 mm, drop to 0.5 mm for fine cosmetic models. - Branch angle higher (40-45 degrees) = supports lean further toward the model = less material. Lower (30 degrees) = straighter supports = more stable on tall prints. - Always enable interface layers (2-3) - the small smooth surface right under the model is what makes tree supports clean. Without interface, branches contact directly and leave deep marks.

No interface layers. Branches contact model directly = deep contact marks. Always enable 2-3 interface layers. Tip diameter too large. A 1.5 mm tip on a tree support leaves a 1.5 mm scar on the model. Use 0.5-0.8 mm tips for cosmetic prints. Using tree supports for tall, narrow supports. Trees can topple. For supports >50 mm tall on small footprints, use Grid pattern instead. Branch angle too high. 50+ degrees and branches start failing to print as the angle exceeds your printer's overhang capability. Stick to 35-45 degrees. Forgetting to slice and preview. Tree generation can produce surprising shapes. Always look at the slicer preview before printing.

For traditional grid supports on tall structures, see how-to-set-up-supports. For preventing support scars regardless of pattern, see support-scarring. For shortening or eliminating supports through better orientation, see how-to-orient-model.