Bridging Speed Enabled for First External Layer

[rmcniff]

I yet again ran into this issue just recently when I forgot to reduce the speed above the infill for a print. I thought I would share a picture to better illustrate how bad this problem can be. The picture is of the same part printed with exactly the same print settings, with the exception that the one on the right was printed with a 50% speed reduction just for the single first layer above the infill. Both were printed with 5 top solid layers. It is readily apparent on the left part that, even after 5 top layers, the surface quality has not recovered after a poorly printing the first solid layer over the infill.

What happens for this one first solid layer is that the filament bead frequently breaks and/or doesn't adhere well to the infill, then curls and sticks up above the rest of the layer. This ruins the subsequent layers as well as the nozzle runs into the spikes sticking up.

[rs4race]

Anything new on this? This would be a huge improvement for me!

I recently experimented with this by manually editing the speed in my gcode. With ultem, slowing down the first layer on top of infil lets the top layers finish without holes. The slower speed isnt necessary for anything other than bridging or on top of sparse infill. I did a 20mm/s slow layer, and then 50mm/s for the layers on top of that. No holes in the top whatsoever. The amount of material that gets picked up on the nozzle is much less too.

[ambrosia3d]

Any heads up about fixing this issue? it's been neglected for so many years, yet it is such an important feature, and so easy to implement.

The BRIDGING SETTINGS should be allowed to be applied to the first layers of any top solid infills happening in your print!

Controlling the "Solid infill underspeed" is not a good solution as it is too general and waists a lot of time, but most importantly you cannot control the extrusion multiplier, which is a must for bridging properly.


What is holding you back S3D?