Snakes! Printed at 0.20mm/layer and 0.10mm/layer
Posted: Sat Jul 07, 2012 10:40 pm
I finally got time today to install and adjust a new nozzle 0.28mm tip. The output filament size is ~0.30mm.
Below are a couple pictures of three attempts.
The first snake in the picture (bottom) is with the old nozzle, 0.50mm output at 0.20mm/layer. This one looks good and prints the fastest, around 25 mins, ~250mm/min.
The second snake in the picture (middle) is with the new nozzle, 0.28mm output at 0.20mm/layer. This one looks better then the previous, but I had problems with the extruder/feeder, explained later. The print time for this one was 1h:55m:30s, over 2.5 times longer, much slower print speed ~100mm/min.
The third snake in the picture (top) is with the new nozzle, 0.28mm output at 0.10mm/layer. This one was the best quality, it almost looks like it was cut from a block and not printed out! This print took 3h:15m:10s, about the same print speed ~100mm/min.
One major issue I ran into with the new nozzle was not the extruder or filament coming out of the tip. It was the filament going into the tip, the amount of force needed to get it to extruder for prolonged periods of time was much more then with the older nozzle. The extruder feeder is capable of some serious torque with the 6.5:1 gearing on it, but I am running into problems with the rollers slipping on the filament, even worse is that it lightly 'sands' the filament as it tries to push it into the extruder and building up the filament dust on the roller, making them slick and harder for them to grip the filament. I tried everything I could think of to keep it from slipping but could not run my printer at more then 120mm/min. Both rollers have knurling and the tension screws have been tightened, loosened, replaced with springs, etc. The max run rates I could get consistently is about 100mm/min, making it painful to print a large object because it could take half a day!
Any suggestions?
Here are Slic3r's gcode output for the two prints (top and middle in the picture) with the 0.28mm nozzle.
; layer_height = 0.20
; perimeters = 2
; solid_layers = 4
; fill_density = .25
; nozzle_diameter = 0.28
; filament_diameter = 1.8
; extrusion_multiplier = 1
; perimeter_speed = 20
; infill_speed = 20
; travel_speed = 120
; extrusion_width_ratio = 0
; scale = 1
; single wall width = 0.32mm
Print time: 1h:55m:30s
; layer_height = 0.10
; perimeters = 2
; solid_layers = 4
; fill_density = .25
; nozzle_diameter = 0.28
; filament_diameter = 1.8
; extrusion_multiplier = 1
; perimeter_speed = 20
; infill_speed = 20
; travel_speed = 120
; extrusion_width_ratio = 0
; scale = 1
; single wall width = 0.39mm
Print time: 3h:15m:10s
Below are a couple pictures of three attempts.
The first snake in the picture (bottom) is with the old nozzle, 0.50mm output at 0.20mm/layer. This one looks good and prints the fastest, around 25 mins, ~250mm/min.
The second snake in the picture (middle) is with the new nozzle, 0.28mm output at 0.20mm/layer. This one looks better then the previous, but I had problems with the extruder/feeder, explained later. The print time for this one was 1h:55m:30s, over 2.5 times longer, much slower print speed ~100mm/min.
The third snake in the picture (top) is with the new nozzle, 0.28mm output at 0.10mm/layer. This one was the best quality, it almost looks like it was cut from a block and not printed out! This print took 3h:15m:10s, about the same print speed ~100mm/min.
One major issue I ran into with the new nozzle was not the extruder or filament coming out of the tip. It was the filament going into the tip, the amount of force needed to get it to extruder for prolonged periods of time was much more then with the older nozzle. The extruder feeder is capable of some serious torque with the 6.5:1 gearing on it, but I am running into problems with the rollers slipping on the filament, even worse is that it lightly 'sands' the filament as it tries to push it into the extruder and building up the filament dust on the roller, making them slick and harder for them to grip the filament. I tried everything I could think of to keep it from slipping but could not run my printer at more then 120mm/min. Both rollers have knurling and the tension screws have been tightened, loosened, replaced with springs, etc. The max run rates I could get consistently is about 100mm/min, making it painful to print a large object because it could take half a day!
Any suggestions?
Here are Slic3r's gcode output for the two prints (top and middle in the picture) with the 0.28mm nozzle.
; layer_height = 0.20
; perimeters = 2
; solid_layers = 4
; fill_density = .25
; nozzle_diameter = 0.28
; filament_diameter = 1.8
; extrusion_multiplier = 1
; perimeter_speed = 20
; infill_speed = 20
; travel_speed = 120
; extrusion_width_ratio = 0
; scale = 1
; single wall width = 0.32mm
Print time: 1h:55m:30s
; layer_height = 0.10
; perimeters = 2
; solid_layers = 4
; fill_density = .25
; nozzle_diameter = 0.28
; filament_diameter = 1.8
; extrusion_multiplier = 1
; perimeter_speed = 20
; infill_speed = 20
; travel_speed = 120
; extrusion_width_ratio = 0
; scale = 1
; single wall width = 0.39mm
Print time: 3h:15m:10s