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Bridge Torture Test

by triffid_hunter, published

Bridge Torture Test by triffid_hunter Oct 26, 2011

Description

See if the circle on the bridge comes out ok!

Struts are hollow to speed printing.

My test with this show me that I must print bridges slowly!

Recent Comments

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Do you know that this doesn't want to print correctly on Cura? I think I'm going back to Slic3r. I've had a lot of good prints with Cura, but in the end Slic3r still seems to outprint it...

All the small details simply are ignored by Cura, the ring on top? It doesn't even generate gcode for it! Printing with a 0.5mm nozzle.

Also, it messes up infill and it has very illogical ways of preheating (first hotend and after the bed, while it should be the other way around, I hate to let my filament cook).

Tomorrow I will try it again with Slic3r. Cura also wants to print this too fast and too hot. Let's see what Slic3r does :)

I'm having the same problem as related by Panda762. The bridge perimeter is being treated as perimeter and not bridge, so it prints slowly and doesn't follow bridge settings (I tried to use a bridge flow of 0.3 and it is still printed with a perimeter's flow). The inner strings are just fine, a perfect bridge.
Again, if I have "perimeters (minimum)" set to 2, I´ll have 2 sagging strings on each side and 4 or 5 perfectly bridging strings in the center.
Thanks!

Panda762, I´m having the exact same problem, have you been able to print it correctly?

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Instructions

1) print
2) observe bridge
3) adjust bridge settings
4) goto 1 unless great
5) observe quality of circle
6) fine-adjust bridge settings
7) goto 1 unless excellent
8) ???
9) profit!

Comments

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Ohmarinus on Jan 25, 2014 said:

Do you know that this doesn't want to print correctly on Cura? I think I'm going back to Slic3r. I've had a lot of good prints with Cura, but in the end Slic3r still seems to outprint it...

All the small details simply are ignored by Cura, the ring on top? It doesn't even generate gcode for it! Printing with a 0.5mm nozzle.

Also, it messes up infill and it has very illogical ways of preheating (first hotend and after the bed, while it should be the other way around, I hate to let my filament cook).

Tomorrow I will try it again with Slic3r. Cura also wants to print this too fast and too hot. Let's see what Slic3r does :)

lucascorato on Oct 24, 2013 said:

I'm having the same problem as related by Panda762. The bridge perimeter is being treated as perimeter and not bridge, so it prints slowly and doesn't follow bridge settings (I tried to use a bridge flow of 0.3 and it is still printed with a perimeter's flow). The inner strings are just fine, a perfect bridge.
Again, if I have "perimeters (minimum)" set to 2, I´ll have 2 sagging strings on each side and 4 or 5 perfectly bridging strings in the center.
Thanks!

Kirkonpolttaja on Sep 18, 2013 said:

printed brilliantly, will post picture later. No change in the setting what so ever with my MakeGear Mosaic printer.

KreAture on Jun 7, 2013 said:

90% of the printtime on this is those long struts.
Is it really that important to discern sag of 2mm and sag of 10mm?
3mm tall struts would be plenty I think.

thingibox on Jun 1, 2013 said:

I couldn't print this one since the bridge flow ratio settings seems to be ignored at least since v0.8.4 to 0.9.9, Any clue?

4ndy on May 10, 2013 said:

Thanks for posting this Triffid. I thought I was going mad or there was something weird about my extruder when I realised that going faster was not better for bridging.

It makes some kind of sense if you think about the extruded bridge filament needing enough time to freeze behind the nozzle so that it doesn't sag as much under its own weight.

Panda762 on May 4, 2013 said:

This thing gives me Headaches, did about 20 of them going back and forth with the quality.......guess i have to keep tryin. Some of the "i made em" pictures are just so amazing precise and clean....wow. Using a Beta Prusa Deluxe with Printrund and Slicer 9.9. But even with the secret Weapon Cura it didnt work out :( The first strokes of the Bridging are done with very slow nozzle movement, seems like they are treated as Perimeter not Bridging??? Then after a few lines it starts to switches to bridging speed, but than i already have drooping and slacking lines. The bridging works fine but the nozzle often destroys the fine lines when it goes over them a few times.......ARGHHHGHGH

lucascorato on Oct 24, 2013 said:

Panda762, I´m having the exact same problem, have you been able to print it correctly?

landrk17 on Feb 24, 2013 said:

Replicator 2 did it perfectly right out of the box

4ndy on May 10, 2013 said:

Pics/vid or it didn't happen.

Tommydag on Dec 15, 2012 said:

One thing I have found when calibrating is that not only do the speed and flow rate need to be changed, but also the temperature. My original settings were not hot enough, so the plastic would be so viscous it stuck to the nozzle. Good luck printing!

tzzhc4 on Nov 15, 2011 said:

I dialed my TOM in and bridging is far better then it was before I calibrated. My issue now is the initial strings are good and straight but when subsequent material is put down on top of those initial strings there is some sag. Do I continue to dial the speed down (at .5 for bridge flow rate multiplier) or is there another setting?

triffid_hunter on Nov 16, 2011 said:

you need a fan to cool and solidify the bridge before the next layer goes on top. It sounds like it's still molten and gooey when the next layer is done at the moment

watsdesign on Nov 1, 2011 said:

I didn't found the perfect settings for the Huxley (not much improvements either by lowering or increasing speed), but will try again later :p

Pointedstick on Nov 2, 2011 said:

Do you have a fan blowing on the print? That helped a lot for me.

MrJohn on Oct 27, 2011 said:

I'm currently printing a 6th one now. Is there a guide to help with this?

triffid_hunter on Oct 28, 2011 said:

if your strings droop, lower the flow rate. if they snap, increase flow rate.

if they don't stick to the towers, reduce speed.

please write a more elaborate guide if you work something out!

Pointedstick on Oct 27, 2011 said:

I didn't find it necessary to slow down to get this bridge printed. In fact, I didn't change anything! I printed with my usual settings of 52 mm/sec perimeters, 130 mm/sec infill, and active cooling.

watsdesign on Oct 27, 2011 said:

Very nice bridge on the last... what were your settings (only tweaking bridge feed/flow?) before and after ? :)

triffid_hunter on Oct 27, 2011 said:

the last one was printed with LH=0.2, feed=80mm/s, bridge feed=0.2, bridge flow=0.15 but of course it'll be machine-specific!

jkeegan on Oct 26, 2011 said:

Am I right that you actually did that bridging in the picture with PLA?

triffid_hunter on Oct 27, 2011 said:

yes, that's PLA.

I wasn't aware that there was a difference in bridging between PLA and ABS, care to elaborate?

qharley on Oct 26, 2011 said:

It seems that there will be much torture before I even start printing my first non printer related part. I hope my repstrap will have a high pain tolerance when it's complete...

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