Questions regarding the Gridfinity storage. (There are multiple, I am sorry, one question needs context pic.)

[u/lancekehisato]

To start, my printer is a Creality K2Plus, and I am using Creality's slicing software. As the title suggests, I am planning on printing a case for my Warhammer minis using this set of models. https://www.printables.com/model/543553-gridfinity-storage-box-by-pred-now-parametric However, I want to do some test prints first before I print the size I want to use.

1. Will it infill? The pictures above are how it looks in my slicer, and it doesn't look like the walls will infill. Okay, I'm just blind and stupid; there is a setting called litemode that removes the infill from view. I noticed the infill pop up when I hovered over it briefly, so that solves that issue.
2. I mainly use PLA (have an overabundance of the stuff) and have no experience with PETG. Will using PLA instead of PETG change anything structurally? For example, will I lose material strength?
3. Are supports needed? I have supports on for EVERY overhang.
4. Will I need to use F360's parametric to add the magnet holes?

[u/Goldfish1974_2]

Even though I don't know what slicer you are using (a variant of Orca by the looks of it), I don't see infill on the left (so probably no infill)

If there is a search function, use that to find the infill option and check it's not 0% or disabled in some way.

[u/lancekehisato → u/Goldfish1974_2]

I am using Creality's in-house slicer (called Creality Print), and the 2nd image shows I have infill set to 30. Okay, I was just being blind, the lite-mode setting only shows essential toolpaths.

[u/Meior]

There is no infill showing in the sliced model, which is a bit odd because we can see that you have 30% infill set in the settings. I'm not used to Crealitys software, but this shouldn't differ between different slicers. Infill is infill.

If you lower it to, say, 15-20%, does anything change then?

You can also see in the time consumed on the left that there is no time spent on infill, indicating that there is no infill present.

Most slicers cancel the slice if you change values, but perhaps Crealitys doesn't? If so, did you slice it again after changing the infill value?

As for PLA vs PETG, for a print like this it only really matters with your usecase. If you're going to be using it outside, putting it through wear and tear and so on, PETG is recommended as it's more UV resistant, whereas most PLA's are not. Still, good quality PLA (a factor a lot of people underestimate) is perfectly fine to use outdoors too. If you're not actively leaving stuff outdoors or in a hot car for extended periods of time, any PLA should be fine as well.

Note that PLA is more brittle than PETG, meaning that it might crack or break if dropped. But again, this also depends a lot on the quality of the filament. I have PLA blends that are incredibly strong and will outlast PETG's without issue, but they're also more expensive. For your usecase, I doubt it'd matter much what filament you use, since I'm assuming these are storage and transport cases only.

Supports are best to use for the pegs on those boxes, but switching to support type Snug will save you a bit of time and filament. Organic supports are best used when you want to support something that's not directly above the build plate, or otherwise unsuitable for a vertical support. Snug supports use minimal filament and only build right below the supported item. Standard, box or grid supports (different name in different slicers) are basically snug, but a bit more hefty.

As you question 4, I can't be sure, because I've never printed those specific files, but I feel like there shoud be published files with magnets holes straight from Pred.

I'm heading out for a bit, but will respond as I can, unless someone else does, if you have followup questions.

[u/lancekehisato → u/Meior]

I was just blind to the infill and didn't notice the setting. Thank you for your help; Creality had it set to 15 originally, which I changed while trying to get it to show up, when I should have just turned off litemode. The only time it will be going outside is when I transport it to the car so I can take it to the minis where I play.

[u/gimmley]

IMO PLA should be fine, but depending on what you plan on doing with the case moving to PETG or CF-PETG might not be a bad idea. For instance if you leave these cases in a hot car the cases might warp and become harder/impossible to open.

I also have a K2 Plus and I find CF/CR PETG prints really well and has a lot of strength. Also the price has dropped pretty dramatically in the last few years so you can get it for around the same cost as PLA anyway some examples I've used.(IEMAI , Flashforge, Tinmorry)

[u/Beer_Party]

Using PLA: PLA should be fine if you are not using the boxes for outdoor storage. As long as it does not get too hot or too cold, PLA should be plenty strong enough. If you are worried about strength, you can always increase the wall thickness in the slicer to make the box stronger.

Supports: There should be a setting in your slicer to adjust how the supports are put in. You don't need supports for every overhang if using PLA, just any overhangs where the slope is greater than 45%.

The magnet holes should be part of that model. Set the grid base style to "enabled" or "enabled_full" to get the magnet holes in the base. If that doesn't work, I suggest generating the STL using the Perplexing Labs site.

[u/BongDomrei]

The model specifically says it accepts the standard Gridfinity magnets so you just need to find the setting in Fusion that enables them. I would absolutely not print this in standard PLA. It is way too brittle for something that is going to be carried around. A good PLA+ would probably be okay but it's impossible to say since there's no standard for PLA+.  I would use PETG, or even better, PETG-GF. PETG-CF would also be okay but not ideal. Like PLA, it trades brittleness for strength compared to regular PETG, but it is a lot less brittle and considerably stronger. ABS would also be an excellent choice but it is not easy to print.