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July 23, 2024 19:08
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| from build123d import * | |
| from gridfinity_build123d import * | |
| import math | |
| # Defaults are for this set: | |
| # https://littlemachineshop.com/products/product_view.php?ProductID=1893 | |
| parallel_pair_count = 10 | |
| parallel_width = 3.0 * 25.4 | |
| parallel_thickness = 1.0/8.0 * 25.4 | |
| shortest_parallel_height = 1/2 * 25.4 | |
| tallest_parallel_height = (1 + 5/8) * 25.4 | |
| slot_clearance = 0.01 * 25.4 | |
| slot_width_extra_for_corner_rounding = 0.02 | |
| slot_width = parallel_width + 2 * slot_clearance + slot_width_extra_for_corner_rounding | |
| slot_thickness = parallel_thickness * 2 + 2 * slot_clearance | |
| minimum_wall_size = 1.5 | |
| slot_z = 2.5 | |
| percent_exposed = 0.33 | |
| shortest_height = percent_exposed * shortest_parallel_height + slot_z | |
| tallest_height = percent_exposed * tallest_parallel_height + slot_z | |
| # Compute the minimum number of grids we need | |
| grid_x = math.ceil((slot_width + 2*minimum_wall_size)/42.0) | |
| grid_y = math.ceil((parallel_pair_count * slot_thickness + (parallel_pair_count + 1) * minimum_wall_size)/42.0) | |
| slot_wall_thickness = (grid_y*42.0 - parallel_pair_count * slot_thickness) / (parallel_pair_count + 1) | |
| offset_y = slot_thickness + slot_wall_thickness | |
| first_slot_y = -grid_y*42.0/2.0 + slot_wall_thickness + slot_thickness/2.0 | |
| with BuildPart() as bin: | |
| Bin( | |
| BaseEqual(grid_x=grid_x, grid_y=grid_y), | |
| height=tallest_height - 3.0, | |
| ) | |
| with Locations([ | |
| (0, first_slot_y + offset_y*n, slot_z) | |
| for n in range(parallel_pair_count) | |
| ]): | |
| Box( | |
| length=slot_width, | |
| width=slot_thickness, | |
| height=tallest_parallel_height, | |
| align=(Align.CENTER, Align.CENTER, Align.MIN), | |
| mode=Mode.SUBTRACT, | |
| ) | |
| with BuildPart(mode=Mode.SUBTRACT): | |
| with BuildSketch(Plane.YZ): | |
| with BuildLine(): | |
| front = -grid_y*42.0/2.0 | |
| back = +grid_y*42.0/2.0 | |
| top = tallest_height + 1 | |
| s0 = Line((front, shortest_height), (front, top)) | |
| s1 = Line(s0 @ 1, (back, top)) | |
| s2 = Line(s1 @ 1, (back, tallest_height)) | |
| s3 = Line(s2 @ 1, s0 @ 0) | |
| make_face() | |
| extrude(amount=grid_x * 42.0 / 2.0, both=True) | |
| bin.part.export_stl("parallels.stl") |
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