As stated, this is a version for people to install heat inserts. Standard or Short M3 inserts from CNC Kitchen.
Please try out the original Senate & support the original via https://www.printables.com/@OurAngryBadger!
https://www.printables.com/model/513350-the-senate-ams-feeder-button-and-protector-for-bam
The author remixed this model.
I love the button mod, but my hands can't handle force cutting (hah) threads into slightly undersized holes. I have edited the holes to accept brass threaded inserts. Pictured are M3x5.7 inserts (Standard Size) from CNC Kitchen.