Bandsaw Tyre

.gitignore

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+.DS_Store
+.venv/

bandsaw-tyre.py

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+#! /usr/bin/env python3
+import fullcontrol as fc
+import math
+
+debug = True
+design_name = 'bandsaw_tyre'
+print_speed = 1000
+max_print_speed = 30000
+fan_percent = 100
+bed_width = 300
+bed_depth = 200
+centre_x = bed_width / 2
+centre_y = bed_depth / 2
+printer_name = 'generic'
+nozzle_diameter = 0.8
+layer_height = 0.3
+min_e_height = 0.01
+initial_z = 0.2
+max_volumetric = 10
+centre_point = fc.Point( x = centre_x, y = centre_y, z = 0 )
+
+band_height = 12
+band_inner_radius = 95
+band_max_thickness = 2.5
+band_min_thickness = 1.75
+band_profile_side_radius = 25
+start_angle = 0
+
+loop_segments = 100
+spiral_loops = ((band_height - initial_z) / layer_height) + 2
+spiral_segments = math.floor(spiral_loops * loop_segments)
+print(f"Loops: {spiral_loops} Segments: {spiral_segments}")
+
+def extrusion_width_at_height(z_pos):
+	z_offset = z_pos - (band_height / 2)
+	extrusion_width = band_max_thickness + math.sqrt((band_profile_side_radius ** 2) - (z_offset ** 2)) - band_profile_side_radius
+	return extrusion_width
+
+def skirt():
+	prime_radius = band_inner_radius - 5
+	prime_loops = 2
+	prime_segments = prime_loops * 50
+	skirt = fc.spiralXY(centre_point, prime_radius - 5, prime_radius, start_angle, prime_loops, prime_segments)
+	skirt.append(fc.Extruder(on=False))
+	skirt.append(fc.PrinterCommand(id='retract'))
+	return skirt
+
+base_e_width = extrusion_width_at_height(initial_z)
+spiral = fc.spiralXY(centre_point, band_inner_radius, band_inner_radius, start_angle, spiral_loops, spiral_segments)
+
+first_slope_starts = loop_segments
+first_slope_ends = 2 * loop_segments
+last_slope_starts = len(spiral) - 2 * loop_segments
+last_slope_ends = len(spiral) - loop_segments
+z_height_per_segment = layer_height / loop_segments
+
+spiral_steps = [fc.Extruder(on=True)]
+z_position = 100
+
+for i in range(len(spiral)):
+	plot = False
+
+	# first layer
+	if i < first_slope_starts:
+		e_height = initial_z
+		z_position = initial_z
+		print("Initial ", end='')
+		plot = True
+
+	# bottom slope
+	elif i < first_slope_ends:
+		e_height = z_height_per_segment * (i - first_slope_starts + 1)
+		z_position += z_height_per_segment
+		print("Bottom Slope ", end='')
+		plot = True
+	
+	# Normal Spiral	
+	elif i < last_slope_starts:
+		e_height = layer_height
+		z_position += z_height_per_segment
+		print("Spiral ", end='')
+		plot = True
+
+	# top slope
+	elif i < last_slope_ends:
+		e_height = (last_slope_ends - i) * z_height_per_segment
+		print("Top Slope ", end='')
+		plot = True
+
+	# top layer
+	else:
+		z_position = band_height
+		e_height = layer_height
+		print("Top ", end='')
+		plot = True
+
+	e_width = extrusion_width_at_height(z_position)
+	radial_offset = e_width / 2
+	print(f"z_position: {z_position} e_height: {e_height} e_width: {e_width}")
+	speed = min(( max_volumetric / e_height / e_width * 60 ), max_print_speed )
+	# if debug: print(f"Speed: {speed}")
+	if plot:
+		spiral_steps.append(fc.Printer(print_speed = speed))
+		spiral_steps.append(fc.ExtrusionGeometry(area_model = 'rectangle', width = e_width, height = e_height))
+		spiral_steps.append(fc.move(fc.move_polar(spiral[i], centre_point, radial_offset, 0), fc.Vector(z = z_position)))
+
+steps = skirt() + spiral_steps
+
+# preview the design
+fc.transform(steps, 'plot', fc.PlotControls(
+	style='tube',
+	tube_type='cylinders',
+	initialization_data = {
+		'extrusion_width': nozzle_diameter,
+		'extrusion_height': layer_height,
+		'neat_for_publishing': True
+	},
+	zoom=0.7))
+
+# generate and save gcode
+gcode_controls = fc.GcodeControls(
+	printer_name = printer_name,
+	initialization_data = {
+		'primer': 'travel',
+		'print_speed': print_speed,
+		'fan_percent': fan_percent,
+		'extrusion_width': nozzle_diameter * 0.8,
+		'extrusion_height': layer_height
+	}
+)
+
+steps.append(fc.ManualGcode(text="M0 ; stop"))
+
+gcode = fc.transform(steps, 'gcode', gcode_controls)
+open(f'{design_name}.gcode', 'w').write(gcode)