With compressed materials, you can exceed the "max inserts per station" limit of 30 and produce additional bolts.
In the video, the piggy bank wagon is on lv. 6, which means it needs 10 materials per bolt and has an input stack size of 9. With some stacking cartridges, I was able to input 9 compressed iron (≙ 45 normal iron) and therefore produce 4 bolts instead of the usual 3 when using uncompressed materials. Also the wagon already starts the sleeping 💤 animation after the first 30 materials.
Although I really like this, since I am able to produce extra bolts, I don't think this is intended. A solution could be to stop consuming after the first 30 and keep the additional materials on the input stack, where they could be removed by the player or kept for the next station.
I know, that there already have been two bug reports about this, but since they are both almost a year old, I thought it might be a good idea to refresh this and provide an additional video. If this is bothering, I am sorry^^
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) where we always have a lot of compressed materials, which you can just throw on the piggy bank at the beginning to get the extra bolts (this is how we discovered this bug in the first place)

