Feature Request : Internal brim for Spiral Vase

[traveltrousers]

Having a brim on the inside and outside would help bed adhesion 100% and is easy to implement.

[alranel]

Good idea - I'd say that this is not actually specific for Spiral Vase and it should be rephrased this way: internal brim when using Fill Density = 0% and Bottom Solid Layers = 0.

[kefir-]

Is there a reason to not use internal brim on other parts as well? For example, I had some trouble with one of the parts when printing the Automatic Transmission Model http://www.thingiverse.com/thing:34778, the troublesome part was http://www.thingiverse.com/download:99903 (sun.stl). I added a normal brim, and that worked fine, but I was actually surprised when the brim was only outside and not in the internal cavity. There could easily have been jagged details inside there as well that caused curling/lifting, and I guess there's currently no way to get slic3r to add a brim in that cavity?

[alranel]

Yeah @kefir-, there was a reason… but I forgot :P

[kefir-]

Here's a better example, from the same part. I just printed the final parts for the transmission model, the stand this time (http://www.thingiverse.com/download:99896). Here's the overview picture of the print, showing the brim on the outside of all pieces. (I printed the first 3-4 layers in green plastic, and then switched to orange for the rest of the print.)

https://googledrive.com/host/0B947HPmfcUmTb3Rodm5nUHBpcXM/DSC_1041.JPG

And here's a picture hopefully showing how the outer edge of the bottom is flat out to, and including, the brim, with no curling on the outer edge. The inner edge, however, curled up, as you can see from the different reflection of the light near the inner edge.

https://googledrive.com/host/0B947HPmfcUmTb3Rodm5nUHBpcXM/DSC_1044.JPG

So in this case I'd definitely like an inner brim! :)

[alranel]

I'll then add internal brim for both island holes and internal area of hollow models (like vases)... let's see how many complaints this will raise ;)

[kefir-]

I'm not saying internal brims are ideal always :-) But in some cases it would definitely be good.

[ledvinap]

IMO this is very model specific. External brim is much easier to remove (cut it with scissors) and in most cases internal brim will be overkill (concave internal shape in kefir's case is notable exception). For spiral vase internal brim is probably remedy for very poor bed adhesion and not necessary in most cases.

What about using negative value for internal and external brim? Old config will work as expected and it won't complicate user interface too much.

[alranel]

I hear a voice saying "...make a new option..."

[traveltrousers]

"For spiral vase internal brim is probably remedy for very poor bed adhesion and not necessary in most cases." - ledvinap

A spiral vase has two points of bed adhesion, the bed itself and the brim next to it and if the wall is thin and the layer small that isn't very much at all. Most prints can survive a little layer separation, a spiral vase is pretty much ruined with any warpage or separation...

Negative value as in -5 = 5mm internal and external? Sounds good....

[queglay]

There are other circumstances where this would be very useful. yes they can be difficult to remove on the interior but on some objects that extra adhesion is really necessary.

For example this large object with ports in it - even if i make a custom interior brim in the bottom to deal with adhesion in the model, it's no good because the curvature is not correct to be able to easily remove the interior brim. just using abs juice is not enough in this situation to print this part without the corners warping upwards.

An interior brim option in this case would solve the problem. This is not just a special case like the vase may be with adhesion, other parts with large holes near the corners could have these issues too.

[kitchung]

I'd like to see this as well. I have a model where support inside an object kept getting knocked off the bed but the support outside stayed on since they were on the brim.

[sjlynch]

+1

[alranel]

Done! A new Interior Brim option is now available.

[bubnikv]

+1