3DPrinting/PrusaSlicer-NonPlainar
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reworked bed adhesion model to use elastic section modulus

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fixed units
updated bed adhesion value
This commit is contained in:
PavelMikus 2022-07-25 17:48:42 +02:00
parent 3f7f5ec0ed
commit 2808e41238
2 changed files with 144 additions and 196 deletions
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23
src/libslic3r/SupportSpotsGenerator.hpp
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@ -8,29 +8,24 @@ namespace Slic3r {
namespace SupportSpotsGenerator {
struct Params {
const float gravity_constant = 9806.65f; // mm/s^2; gravity acceleration on Earth's surface, algorithm assumes that printer is in upwards position.
// the algorithm should use the following units for all computations: distance [mm], mass [g], time [s], force [N]
const float bridge_distance = 12.0f; //mm
const float bridge_distance_decrease_by_curvature_factor = 5.0f; // allowed bridge distance = bridge_distance / (this factor * (curvature / PI) )
const float min_distance_between_support_points = 3.0f;
// Adhesion computation : from experiment, PLA holds about 3g per mm^2 of base area (with reserve); So it can withstand about 3*gravity_constant force per mm^2
const float base_adhesion = 3.0f * gravity_constant; // adhesion per mm^2 of first layer
const float support_adhesion = 1.0f * gravity_constant; // adhesion per mm^2 of support interface layer
const float min_distance_between_support_points = 3.0f; //mm
const float support_points_interface_radius = 0.6f; // mm
const float gravity_constant = 9806.65f; // mm/s^2; gravity acceleration on Earth's surface, algorithm assumes that printer is in upwards position.
const float max_acceleration = 9*1000.0f; // mm/s^2 ; max acceleration of object (bed) in XY (NOTE: The max hit is received by the object in the jerk phase, so the usual machine limits are too low)
const float filament_density = 1.25f * 0.001f; // g/mm^3 ; Common filaments are very lightweight, so precise number is not that important
const float yield_strength = 33000.0f; // mN/mm^2; 33 MPa is yield strength of ABS, which has the lowest yield strength from common materials.
const float standard_extruder_conflict_force = 1.0f * gravity_constant; // force that can occasionally push the model due to various factors (filament leaks, small curling, ... ); current value corresponds to weight of X grams
const float malformations_additive_conflict_extruder_force = 100.0f * gravity_constant; // for areas with possible high layered curled filaments
const float filament_density = 1.25e-3f ; // g/mm^3 ; Common filaments are very lightweight, so precise number is not that important
const float bed_adhesion_yield_strength = 0.128f * 1e6f; //MPa * 1e^6 = (g*mm/s^2)/mm^2 = g/(mm*s^2); yield strength of the bed surface
const float material_yield_strength = 33.0f * 1e6f; // (g*mm/s^2)/mm^2; 33 MPa is yield strength of ABS, which has the lowest yield strength from common materials.
const float standard_extruder_conflict_force = 20.0f * gravity_constant; // force that can occasionally push the model due to various factors (filament leaks, small curling, ... );
const float malformations_additive_conflict_extruder_force = 300.0f * gravity_constant; // for areas with possible high layered curled filaments
};
struct SupportPoint {
SupportPoint(const Vec3f &position, float force,const Vec3f& direction);
SupportPoint(const Vec3f &position, float force, const Vec3f& direction);
Vec3f position;
float force;
Vec3f direction;