scarfjoint enforcer modifier - PrusaSlicer

RE:

Träd-E — Mon, 09 Feb 2026 20:45:32 +0000

I forgot to mention another trick that I use in this model. For small pins and holes an effective way to get a consistent dimensions is simply adding a small triangle shaped groove, 0.2mm x 0.2mm in the model effectively removes the bulge that usually accompanies the groove where the seam is. Doing this just leaves a groove.

RE: scarfjoint enforcer modifier

Träd-E — Mon, 09 Feb 2026 18:32:40 +0000

Here's the shenanigans I've been up to with this https://www.printables.com/model/1581166-massage-shower-head-with-exchangable-nozzle

I've mostly solved it, I'm still not 100% satisfied but using a very short scarf joint (2-4mm) in conjunction with "only on smooth surfaces" yields descent enough of a result. It doesn't really add any print time either, as using "around entire perimeter" do, however it's not quite as smooth. The problem in question is making a watertight-ish seal for a dual mode showerhead withouth using o-rings or TPU.

As I've been working on this, I think that actually being able to paint where to add scarfjoints vs normal seams would make the most sense? so if anyone at prusa reads this; do that ;D ... Then again, this is probably a highly specialized rarely need feature so .... case closed ;P

RE: scarfjoint enforcer modifier

Träd-E — Fri, 16 Jan 2026 17:33:38 +0000

😘

RE:

Träd-E — Thu, 15 Jan 2026 17:22:58 +0000

I'm finding more inconsistent behavior concerning this. Setting the seam position seams to affect how "smooth" the surface needs to be for "Scarf joint only on smooth perimeters" to take affect, where having it set to "rear" gives the most expected result.

Random: Scarf joints are applied everywhere, needless of geometry, ie '..only on smooth..' is basically ignored

Nearest: The diameter of a hole needs to be significantly larger to be considered "smooth" not sure exactly but a 6mm hole is consider "unsmooth" so no there scarfjoint.

Aligned: Seeeeaams .... aa aa! to behave quite the same as 'Nearest'

Rear: Behaves very well, even a hole with a 4mm diameter gets a scarfjoint while outer perimeters with some sharp edge is ignored. I do wish all joint placement settings would behave like this.

RE: scarfjoint enforcer modifier

Träd-E — Mon, 12 Jan 2026 00:19:59 +0000

There should be more time to edit posts on this forum.... Writing samething again;

Dangit! I thought I found a workaround there for a second! Enabling "external perimeter first" on the modifier fixes "single perimeter on top surface" .. Sadly it doesn't fix the scarfjoint issue..

RE: scarfjoint enforcer modifier

Träd-E — Mon, 12 Jan 2026 00:08:36 +0000

"single perimeter on top surface" also seems to suffer from this bug...

RE: scarfjoint enforcer modifier

Träd-E — Sun, 11 Jan 2026 23:51:38 +0000

The whole reason why I'd like this to work is because using scarfjoints increases the average dimensional accuracy of pins and holes, especially if they are small (2-3mm)

Using random seam placement also greatly increases the average dimensional accuracy, but this option is also not available as a modifier :'(

The surface isn't necessarily smoother, in fact it's less smooth, but fitment is better and alignment also...

RE: scarfjoint enforcer modifier

Träd-E — Sun, 11 Jan 2026 23:27:12 +0000

I just now realized the file didn't attach, didn't zip it I guess..

5ac236e6-scarfjointtest.3mf.tar.gz

scarfjoint enforcer modifier

Träd-E — Sat, 03 Jan 2026 20:26:29 +0000

Is this a bug or a known limitation; The enforcer, cylinder in this case, only functions if the cylinder is scaled to apply to complete layers. ie I cannot force only a center pin to have scarfjoints or viceversa. I attached an example project, I tried to enforce fuzzy skin on the inner pin too and that work perfectly fine. But for scarf joints the cylinder needs to be scaled to span complete layers. Which, by coincidence, is not what I want in my current project.

no scarf joint :(

---------------------------

And here the enforcer is scaled to span the complete layers

behold, scarf joint!