Paper clip jar

I didn't want to make a lid that has food contact because most 3D prints are not food safe due to filament, nozzle and other factors.

I have printed in Prusa Petg in standard settings.
No support is needed. 
In the 3 MF file and in the g-code a pause is programmed to insert two magnets. The dimensions of the magnets are 35mm x 4mm x 2mm. You can buy them here.

https://www.magnet-shop.com/neodymium/blockmagnets/blockmagnet-35.0-x-4.0-x-2.0-mm-n52-nickel-holds-2-kg

The model is parametric and can be adapted to any glass.
Simply measure the inner diameter of the glass neck and enter it in Fusion 360 in the table at inner diameter. 
For the outside diameter, measure the outside edge of the thread and enter it in the table at outside diameter.
Finally, measure the height of the thread and enter this number in the thread height field. 

If you want to use other magnets, that's no problem either. In the field Magnet height and Magnet thickness you can also specify other dimensions. The length of the slots in which the magnets are inserted depends on the size of the lid. 
My magnets do not completely fill the slot, but that has never been a problem. You will only need several magnets next to each other for very large jars.