Support:
Other:
thank you very much for taking the time 
Unfortunately, @jay59687 ‘s settings didn’t work for me. But I was finally able to get a decent temperature tower with beautiful overhands any temperature from 210ºC to 230ºC with the following settings… oh new users can’t add images… okay…
I esentially disabled “Slow Down For Overhangs” by setting all the options to 75 mm/s, set the wall order to “Inner/Outer” to help with overhangs, enabled “Extra Perimeters on Overhangs”, slowed down the cooling fan to 60% for overhangs as the fan blows the filament down.
I’ll keep iterating but this is the best for the last 3 days that I was dealing with this issue. I’ll add photos as soon as I’m allowed to.
I have yet to figure out how to get decent bridges on my sv08. Everything else feels dialed in except bridges.. no matter what I try they are sub par at best compared to the Bambu printer sitting next to it as an example.
Anybody have good settings for bridges?
I’m printing in the latest new PETG formula from Polymaker (great PETG!).
I’m printing at 250c.
I managed to improve the bridging by dropping the print temp to 240 and the bridge speed to 70 and disable thick bridges. And the bridge flow ratios set to 0.75. It’s better than before in my 50mm test model.. but still not great.
I tried faster bridging than 70 and slower.. slower sags too much I think due to sub par cooling of the sv08… Anything faster than 70 got messy. The flow ratio seemed to perform best by dropping it to 0.75 or more sagging.
Anyone have any part cooling upgrades that I could try?
The new Orca Slicer Dev build has improved bridges. You can check here: Increase Bridge Density Maximum by MakeSometh1ngWonderful · Pull Request #11283 · OrcaSlicer/OrcaSlicer
The trick is not to reduce the flow instead go over 100%
Thanks. I followed this and also the subsequent video and models from printables to test.. both the original method and the new method he is working to get into Orca. Nothing resulted in good bridges for me. I’m also using orca nightly.
It feels like poor cooling to me.. so much sagging. The methods he uses make sense to me but I feel like the lines don’t cool right and end up saggy..
I’m also struggling with bridges and overhangs on my sv08. It’s almost like the (very powerful) fan is blowing the filament downward during a bridge or steep overhang causing a stringy mess.
I’m trying now to mess with the fan speeds in orca, but unfortunately it seems there’s no way to force a lower fan speed for bridges/overhangs in orca, only a higher one. It appears that if I set a bridge fan speed lower than the “normal” fan speed it’s simply ignored and the normal fan speed is used.
I’m also trying out the nightly version of orca with the > 100% external bridge density patch to see if that helps. Like @csmall everything prints great on my sv08 except bridges and steep overhangs and it’s kinda driving me crazy that I can’t figure out why!
The one thing I’ve found that does improve bridges is increasing speed. If the problem really is that the fan is blowing the filament downward I suppose this makes sense, but it seems to fly in the face of the general advice that slower bridges === better bridges.
I gave up for now. But I do think you should try making sure you have the wall order set to Inner/outer and test with that.My understanding is this is best for overhangs. However the trade off is usually maybe surface quality. Inner/outer/inner is worst for overhangs I think…but better for surface quality. Outer/inner is like inner/outer/inner but with worse seams.
Yeah I always use inner/outer. Outer/inner gives overhangs nothing to adhere to so is really only usable for models without overhangs. IDK why the default orca profile for sv08 has outer/inner as it’s default.
I’m still experimenting and will report back here if I figure anything out.
1 Like
I’ve figured out a couple things so far:
- The fan definitely is part of the problem. It blows the filament down when bridging, causing stringy first bridge layers. I verified this by watching it print temp tower bridges with fan at 100%, it was definitely bending the bridge down with the force of the airflow.
- You can’t force orca to use a slower fan speed for bridges than the fan speed calculated for that layer overall. Only faster. That means you have to drastically lower fan speeds overall if you want to avoid bridges blowing being blown down.
- I’m still experimenting with it but the nightly orca slicer that allows > 100% external bridge density appears to help. Need to run some more tests with different values and speeds. Without this setting the problem was doubly bad – lines in bridges spaced too far apart to stick to each other and being blown downward by the fan.
Slow process of elimination, but getting somewhere!
OK I may have cracked it! Give these settings a try using latest orca nightly build:
- Wall order: inner / outer – gives outer walls something to stick to for overhangs
- Line width - internal solid infill: 0.4 -– assuming a 0.4 nozzle. For some reason orca uses internal solid infill line width for bridge line width. Since a bridge can never be wider than nozzle width (nothing to squish against for wider line) set this == nozzle size.
- Bridge flow ratio: 1.0 to ~1.06 – When less than 1 orca generates a significant gap between the outermost bridge lines and the inner bridge infill. Why, I’m not sure, but it does.
- External bridge density: 110-120% – This essentially moves the bridge infill lines closer together so they stick to their neighbors as they’re laid down. This is what you need the nightly build for so you get this pr that allows > 100% bridge density
- Thick external bridges: off – when this is “on” orca leaves a big gap between the outer bridge lines and bridge infill. Not sure why.
At least so far using a temp tower for testing this seems to massively improve bridges. They aren’t sagging under the fan’s pressure anymore because the infill lines actually stick together. Nice flat bridges on my temp tower, no saggy lines under each bridge anymore. The outermost line still seems too far separated from the infill and is sometimes a little loose on it’s own, but it’s still a lot better. I’m going to keep playing with it, but this is very promising.
That’s great news. Excellent work man. I hope you cracked it! I need to try these settings out soon! Overhangs and bridges are my biggest issue with the sv08 at the moment.
Ah, also turn off “precise wall” – that causes the outermost wall to not overlap with the inner wall next to it which also makes overhangs and bridges worse. I’ll have to print some more tests but so far it looks like the overhang/bridge problems can be solved with these settings.
1 Like
Nice work man. I’ll have to try it and it would be good for others to also try and confirm
1 Like
Ah, more investigation revealed some bugs in Orca with bridging. You must set “Bridge counterbored holes” to “Partially bridged”. Without this setting (even if you have no counterbored holes!) orca bugs out and generates “overhang walls” instead of actual bridges. This is what causes the gaps between the outer bridge lines and inner that I was seeing. Also if this is not enabled and you set “extra perimeters on overhangs” then it will generate overhang walls for the entire bridge, usually unanchored and printing midair spaghetti instead of an actual bridge. It seems that Bridge counterbored holes: Partially bridged solves a ton of problems with bridging in orca. Extra perimeters on overhangs vs Bridging by andrewleek · Pull Request #10565 · OrcaSlicer/OrcaSlicer · GitHub Improve bridges using a technique suggested in @MakeSometh1ngWonderful YouTube channel. · Issue #11209 · OrcaSlicer/OrcaSlicer · GitHub
Hello and thanks for the profile sharing.
ive been toying with the settings suggested for petg with temperature towers .
Here is what ive learned.
- Thick Bridges : OFF else gets super soggy at 70% fan speed and 100mm/s.
- Thick internal Bridges: OFF
Filament setting
- overhang threshold set to 75% from 95% that i used previously, helped with the overhangs.
So i still have issues with the bridges they are still stringy.
I didnt get any improvements from
- Bridge flow ratio 1.04 or 1.06 no or little change from 1
- Bridge density at 1.1 or 1.2 was better without from 1.0.
I think lowering the fan speed will probably give the best result maybe to the point where its possible to use thick external walls.
Here is the Filament profile
‘‘‘Json
{
“compatible_printers”: [
“Sovol SV08 0.4 nozzle”
],
“fan_cooling_layer_time”: [
“30”
],
“fan_max_speed”: [
“70”
],
“fan_min_speed”: [
“10”
],
“filament_cost”: [
“10”
],
“filament_max_volumetric_speed”: [
“8”
],
“filament_notes”: [
“2025 12 01\n- lower the fan speed to 70% from 100% for overhangs and bridges. \n- Lover the treshhold for overhang from 95% to 75%.”
],
“filament_settings_id”: [
“gst3d PETG”
],
“filament_vendor”: [
“gst3d”
],
“from”: “User”,
“hot_plate_temp”: [
“75”
],
“hot_plate_temp_initial_layer”: [
“75”
],
“inherits”: “Generic PETG @System”,
“is_custom_defined”: “0”,
“name”: “gst3d PETG”,
“nozzle_temperature”: [
“250”
],
“nozzle_temperature_initial_layer”: [
“250”
],
“overhang_fan_speed”: [
“70”
],
“overhang_fan_threshold”: [
“75%”
],
“slow_down_layer_time”: [
“5”
],
“version”: “2.3.0.3”
}
{
"bottom_shell_layers": "4",
"bridge_speed": "100",
"brim_type": "no_brim",
"elefant_foot_compensation": "0",
"ensure_vertical_shell_thickness": "ensure_critical_only",
"extrusion_rate_smoothing_external_perimeter_only": "1",
"from": "User",
"gap_infill_speed": "100",
"infill_combination": "1",
"inherits": "0.20mm Standard @Sovol SV08 0.4 nozzle",
"initial_layer_acceleration": "8000",
"initial_layer_print_height": "0.3",
"initial_layer_speed": "50",
"inner_wall_acceleration": "14000",
"inner_wall_speed": "170",
"internal_bridge_speed": "100",
"ironing_pattern": "concentric",
"is_custom_defined": "0",
"layer_height": "0.12",
"min_bead_width": "100%",
"name": "0.12mm Fancy Models 0.4",
"notes": "2025 12 01 \\n-removed thick internal bridges\\n\\nReduced layer overlap from 30% to 27% after seeing some blobs. 250907",
"outer_wall_speed": "100",
"overhang_2_4_speed": "0",
"overhang_3_4_speed": "50",
"overhang_4_4_speed": "50",
"print_settings_id": "0.12mm Fancy Models 0.4",
"skirt_distance": "20",
"skirt_loops": "0",
"slow_down_layers": "1",
"sparse_infill_pattern": "honeycomb",
"staggered_inner_seams": "1",
"support_on_build_plate_only": "1",
"support_threshold_angle": "30",
"thick_internal_bridges": "0",
"top_bottom_infill_wall_overlap": "27%",
"top_shell_layers": "5",
"top_shell_thickness": "0",
"top_surface_acceleration": "8000",
"top_surface_pattern": "monotonic",
"top_surface_speed": "100",
"version": "2.3.0.3",
"wall_generator": "arachne",
"wall_loops": "4",
"wall_sequence": "inner-outer-inner wall"
}