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yellowshark

Cura brim problem?

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Posted · Cura brim problem?

Hi, having been using Slic3r I thought it was about time to try CURA again. So yesterday I downloaded the latest version. My first 4 attempts failed so I switched to Slic3r and it worked 1st time.

As you can see the part is quite small

brim2

On each occasion the part came away from the bed - something I just really do not suffer from.

On closer inspection I saw that of the brims had gaps in them

brim1

 

This may be CURA normal but with Slic3r I always get solid brims. I cannot see any settings in Cura to control the brim apart for the number of lines. Is this a normal CURA brim?

 

Bed temp. was 60c; filament depth for 1st layer was 300 microns;1st layer speed was either 20 or 30m/s. Extruder temp for 1st layer was 220 for some 215 for the others (printing temp 210)

 

All ideas appreciated :)

 

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Posted · Cura brim problem?

Never seen this problem happening on an Ultimaker. Maybe you're getting less extrusion then you are expecting?

As visible in the layer view, the brim is connected. (The layer-view parses the GCode and calculates extrusion widths from that)

 

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Posted · Cura brim problem?

You should also have a solid brim in Cura.

Perhaps your bed is just slightly too far away from your nozzle.

Instead of squeezing the filament on the bed it is now more laying it on there.

I think this will create the gaps in your brim.

 

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Posted · Cura brim problem?

Line width and Slic3r reminds me of a http://www.extrudable.me/2013/11/03/slic3r-strange-defaults-causing-qu-bd-woes/. There he is writing about line width settings in Slic3r.

Maybe you found settings in Slic3r which give you a nice result with the original (0.65mm I think) line width settings? Taking all other settings such as e.g. a tweaked filament diameter to Cura which doesn't know a line width setting would then result in too thin lines.

It's just a rough theory... :wink:

 

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Posted · Cura brim problem?

Thanks for the help guys, much appreciated.

I thought about this some more this morning and recalled that I had seen these gappy brims when I was testing/analysing what was the best Z-offset distance for me. So I checked and saw that the start g-code I had used in Cura was very marginally different to what I had been using (the method of definition between the two is different).

So I changed the distance an reran and I am please to say it was successful :)

Well I say successful, one of the two pointy bits had a nice rhino horn and it is clear that a few layers from the end the nozzle tip caught on this. The piece was so well stuck to the bed that it did not move, but the glass bed did!!

Apart from that I am very pleased with the end result.

 

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