topic Re: This needs to be a bug report in Fusion Manufacture Forum

Additive / bad toolpaths for solid infill in concave features

tim.wallsXFXNQ — Sun, 15 Nov 2020 13:43:14 GMT

Hiya,

Not sure if there's a button I need to switch on somewhere in the settings, or if this is a bug.

Basically, F360s toolpath generator does a bad job wherever you have solid infill (i.e. surface layers) inside a concave feature (e.g. the bottom of a well.) Because F360 doesn't print a perimeter around the interior edge, the start/end of the infill lines are entirely unsupported and will produce a mess. (After 3 layers there's enough accumulated gloop that you'll get "a" surface but it'll be messy and full of holes.) In contrast, convex surfaces (i.e. those with an exterior perimeter around them) will print perfectly.

https://a360.co/35tW7fM

You can use this model as a simple example. The two 'wells' (left, and top-right), will have a horribly messy surface in the print. The surface at the bottom-right though will print perfectly.

This closeup of the generated paths shows the problem:

The lines of the surface fill are clearly starting and finishing in mid-air, with nothing to support them.

The solution would be for the generator to generate an internal permiter around the solid infill before filling it in. This still has a small risk at corners but on the whole it seems to work - for contrast, this is what Ultimaker Cura outputs for the same feature:

Note the additional perimeter line which is printed first, giving the infill something to hang on to.

If I missed a button in the print settings somewhere, feel free to let me know I'm an eejit; if not, please accept this as a bugfix! 🙂

This needs to be a bug report

tim.wallsXFXNQ — Tue, 24 Nov 2020 10:00:02 GMT

So, in the absence of anyone telling me I've pressed the wrong button, I have to assume this is a bug.

How does one get this raised as a bug report and a ticket number? It's basically a showstopper for using F360 additive for anything other than toys.

Re: This needs to be a bug report

seth.madore — Tue, 24 Nov 2020 20:46:21 GMT

I've shared this with the Additive team, hopefully we can get someone to comment on this before long. Poke me again next week if there's still no answer!

Re: This needs to be a bug report

tim.wallsXFXNQ — Wed, 02 Dec 2020 10:15:52 GMT

Hey, hi Seth... Poking, as requested :D.

Cheers,

Tim

Re: This needs to be a bug report

thomas.stock — Wed, 09 Dec 2020 18:26:51 GMT

Hi @tim.wallsXFXNQ

I apologise on behalf of the additive team for not getting back to you on this straight away when we were notified of your forum post

Thank you for bring this to our attention. We have noted this issue and will implement a fix in a future release!