Gridfinity Festool Systainer Mini SYS3 S 76

There are several models out there which allow you to add the Gridfinity system to your Mini Systainer. Besides simple grid models, some guys designed some interesting models that use the available space more effectively, for example, score9 used some custom-sized Gridfinity bins at the back and schuylab used the space at the front for some additional small storage. However, all models I found were lacking some simple feature I needed:  they do not offer a (printable) lid cover. So, once you hold the Systainer upside down, parts can move from one storage bin to another, especially when using the SYS3 S 76 due to its lid design (see pictures).

My model comes with the full package:

• A 3x6 Standard Gridfinity grid base
• At the back there is a 1x5 custom-sized Gridfinity grid base (47mm x 21mm)
• At the front there is an additional small storage for bits or similar sized objects
• A printable lid cover, which keeps your items in their bins even if the Systainer is held upside down (tested with a one millimeter thick washer)
• A set of storage bins, for both, standard size and custom size

Instructions:

1. The SYS3 S 76 already allows to divide the available space in up to 6 pockets by using plastic partitions. These are usually mounted inside the Systainer. You need to remove these mounts first:
   
   So the result looks like this:
   
   !!!
   You will probably lose warranty if you do this. You could also damage your box. Do this at your own risk! I am not liable for any damages.
   !!!
2. Now print the lid cover, base, front filler and the desired storage bins. My settings:
   - I used both PLA and PETG
   - 20% infill, Gyroid
   - no brim
   - Wall printing order: inner/outer/inner
   - supports enabled where needed (front filler and multi-cell bins)
   - The lid cover maxes out the print width of a Bambulab P1S (256mm). So you need to ensure you can print models of that size.
3. Add magnets (6mm x 2mm) to the desired cells and bins. I used cyanoacrylate adhesive (instant glue) for that. I use two magnets for each cell. While you could use four magnets for the standard-sized grid cells, you can use only two magnets for each custom-sized grid cell, because the magnet-holes do overlap. Overlapping holes may sound bad, but this allows you to use the same magnets for all cells instead of buying different ones.
4. Before inserting the lid cover to the lid, put some double-sided adhesive tape on the back of lid, especially on the bottom side. Take care of the pins. They can break easily and are only used to align the cover.

Notes and FAQ

Designed for SYS3 S 76

This model is designed specially for the SYS3 S 76 which comes with partitions. I know there are other/older versions of a Mini Systainer available. As far as I know the lid design is different. So the lid cover of this model will not fit on those Systainers. The dimensions of the main compartment may be the same, but I don't know for sure. You have to test it. Feedback welcome :-)

Why is the base so thick?

I wanted to have a lid cover such that items cannot move between bins once the box is held upside down. So the lid cover needs to have a very small distance to the top of the bins. The dimensions of the bins are given by the Gridfinity spec. A height of 6u (+ stacking lip) fits into the Systainer. But to get the top of the bins close to the lid cover, I had to make the base thicker/higher.

Why did you provide models for storage bins?
Can I use other storage bin models?

There are two types of bins used for my model: standard-sized and custom-sized.
To utilize all available space of the Systainer a custom-sized grid was added at the back (the last row). Since you will not find models for those dimensions I added them here.
But I also added models for standard Gridfinity dimensions. This is because models vary in their total height. Some bin models use a stacking lip, some don't. Some models have higher or smaller stacking lips and so on. Since I wanted to ensure parts cannot move between bins, I decided to add the models here as well. But of course, you can use whatever model you want. Just take care of the bin's height. My 6u bins have a total height of 46mm. If your desired model is taller it may hit the lid cover. If it is too small, parts may move around when the Systainer is held upside down.
FYI: The bins were generated using the Gridfinity Workbench of FreeCAD.