Hello All I wonder if anyone could tell me how best to deal with bridges? Do I want it to run faster over the bridge? slower? Extrude more? less? I have a bridge of about 21mm I wish to span. I am using PLA and Skeinforge. Thanks https://reprap.org/forum/read.php?1,83730,83730#msg-83730 Sun, 12 Apr 2026 02:23:55 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,83730,83876#msg-83876 https://reprap.org/forum/read.php?1,83730,83876#msg-83876
I have tried to tweak the feed rate manually, but can't get good results with it, and it counters the idea behind volumetric extrusion.]]> Nudel General Mon, 16 May 2011 08:00:10 -0400 https://reprap.org/forum/read.php?1,83730,83873#msg-83873 https://reprap.org/forum/read.php?1,83730,83873#msg-83873
Sorry for being thick but could you clarify your ratio settings? Are you setting your Bridge feed rate multiplyer @ 0.8 leaving the bridge flow rate multiplier at 1 (giving a ratio of 0.8 as I understand it) or are you setting both variables to 0.8?

I would imagine setting the feed rate 0.8 and flow rate 1 would give roughly what I saw when the infill (very short zigzags) seemed to cross the gap when straight processes did not.]]> AgeingHippy General Mon, 16 May 2011 07:48:22 -0400 https://reprap.org/forum/read.php?1,83730,83848#msg-83848 https://reprap.org/forum/read.php?1,83730,83848#msg-83848
There is a 13mm bridge on this print (the bottom clamp), and it's pretty much flawless. [www.thingiverse.com]

Wade's extruder body also prints really nice with these settings, and that part has been a pain for me to print before.]]> Nudel General Mon, 16 May 2011 04:24:36 -0400 https://reprap.org/forum/read.php?1,83730,83843#msg-83843 https://reprap.org/forum/read.php?1,83730,83843#msg-83843
interesting. Anyway - I need more tests.]]> AgeingHippy General Mon, 16 May 2011 03:23:12 -0400 https://reprap.org/forum/read.php?1,83730,83837#msg-83837 https://reprap.org/forum/read.php?1,83730,83837#msg-83837
You can test with support-structures or print a solid bow under the bridge with a small gap to the bridge and manually cover the top surface of the bow with grease or similar to prevent fusing ...]]> VDX General Mon, 16 May 2011 01:59:46 -0400 https://reprap.org/forum/read.php?1,83730,83743#msg-83743 https://reprap.org/forum/read.php?1,83730,83743#msg-83743
run with faster feed rate over the bridge. it is easier to modify feed rate rather than change flow rate just for the bridge. experiment a little. try 1.1-1.2 feed rate over bridges.

IMHO]]> jamesdanielv General Sat, 14 May 2011 16:48:14 -0400 https://reprap.org/forum/read.php?1,83730,83741#msg-83741 https://reprap.org/forum/read.php?1,83730,83741#msg-83741
With PLA, temperature is critical. You want to find out how low you can go without the extruder jamming and use a temp just slightly (a few degrees) above that for you bridges.

Speculation:

After that you need to find the sweetspot for speed/flow and this will likely depend on your nozzle.]]> Greg Frost General Sat, 14 May 2011 16:30:31 -0400 https://reprap.org/forum/read.php?1,83730,83730#msg-83730 https://reprap.org/forum/read.php?1,83730,83730#msg-83730
I wonder if anyone could tell me how best to deal with bridges?

Do I want it to run faster over the bridge? slower?

Extrude more? less?

I have a bridge of about 21mm I wish to span. I am using PLA and Skeinforge.

Thanks]]> AgeingHippy General Sat, 14 May 2011 12:14:45 -0400