cleaning up the seam

[hakanai]

So i have been getting pretty good prints out of my machine, but now that I am getting them nice and clean the seam has become very noticeable. I am using 7mm retraction, 2mm wipe, .1 seam hiding, and 20 degree jitter. On larger prints like the one pictured it is purely aesthetic, but on some smaller precision parts it is a problem. Any pointers?

[Jimustanguitar]

On thin-wall parts, you can use the Joris (Cura) or Spiral Vase (Slic3r) settings to keep the extruder from stopping and starting like that. On a more solid part, I'm not entirely sure. There's a randomize start/stop points setting, but I've heard more bad about this setting than good. I think there are also some retract/restart settings that come into play on a layer change, but I can't tell you what the "right" settings are...

Very very nice looking print though!

[gestalt73]

That effect is exactly why I've disabled wipe in kisslicer. after about two weeks of experimenting, I've finally found a combination of settings that effectively minimize the seam.

I've found that the only way to minimize seams was to minimize the z-lift as much as I could, and drive the bowden HARD and FAST. Also max out z lift, and maxing out x y didn't seem to hurt. the faster you move, the less time the hot end has to ooze.

I've used these settings at 0.2, 0.25, 0.3, and 0.4 (draft prototyping)

I've been producing some gorgeous, detailed parts with the following:

EEPROM Settings:
- x,y,z max speed: 300.00 (just in case you need it)
- x,y,z axis accel: 2000.00
- x,y,z travel accel: 2000.00

(these settings are needed to cooperate with the kisslicer feed settings)
- Extr 1 Max Feedrate: 100.00
- Extr 1 Start Feedrate: 100.00
- Extr 1 Accel: 6500.00 (this was the default)

Style Settings:
layer_thickness_mm=0.4
use_destring=1
use_wipe=0


Material Settings:

Code: Select all

temperature_C=240
keep_warm_C=175
first_layer_C=240
bed_C=80
sec_per_C_per_C=0.00681818
flow_min_mm3_per_s=2
flow_max_mm3_per_s=22
destring_suck=10
destring_prime=10
destring_min_mm=3
destring_trigger_mm=5
destring_speed_mm_per_s=100
Z_lift_mm=0.2
min_layer_time_s=20
wipe_mm=0

Printer Settings:

Code: Select all

z_speed_mm_per_s=300
z_settle_mm=0
travel_speed_mm_per_s=300
first_layer_speed_mm_per_s=60
dmax_per_layer_mm_per_s=20
xy_accel_mm_per_s_per_s=2000

[Flateric]

Hmmm, I use wipe and randomize start position with excellent results.

The blobbing that is going on there is something else on top of this though. I should know this but I seem to be too tired. I'll have a think on it and get back to ya.

An example of wipe and randomize start point (jitter in Kiss)....

http://i.imgur.com/CvFIh9N.jpg

[lordbinky]

I cleaned up my corners and cleared up my seams in kisslicer completely by turning off wipe, using destring, and then setting my max accel to 4000 (firmware changed to 2000 or 4000 I can't remember), my jerk setting in firmware is like 60 now (I can do 100 and it prints fine at like 120mm/sec, but the machine gets close to trying to impersonate the danceing toaster from ghostbusters 2), z height speed to something silly like 100+, then just toyed with the seam overlap and destring setting for my filament. It cleared up so well the bulges at the corners disapeared and I was able to dial in my seam to be so clean if you couldn't tell which corner of a cube was the seam from the side by looking at the light reflect on the cube's walls, you had to look at the top to see the slight change in the trace.

For destring the black ABS I'm using right now is runny compaired to the gray I had before, so I bumped my prime and suck values up to 10 and then actually had to lower the prime to 9 and leave suck at 10. That was determined by watching the behavior right after the seam. Lower both values if you get popping or wait until you get your prime and suck settings where you like the result, then lower them to just before getting unclean transitions again. You want them low to decrease print times. It makes a difference for my print times at least.

I wouldn't suggest just making the changes and expecting it to work, among my upgrades I do have magnetic arms setup, but my intent was to turn settings way up and then bring them back down to reasonable levels, but it just worked so well I just didn't feel like changing them.