Just a question out of curiosity
Where and what for do you use machining (milling, turning) for your 3D printers or in conjunction with your 3D printed projects?
I will start with a few parts that I did:
This is an extruder drive wheel made from brass:
I also made my own heater blocks ('cause I'm cheap and milling is fun). The left one is one from china in comparison:
Here is a custom cooling block for a tilting extruder (which was later replaced with a watercooled one):
For the cooling blocks I also had to make an M7 tap...
And finally some brackets for an absurdly overpowered 32 mm ball screw that I got from eBay for next to nothing. To be fair, my printer is quite sturdy and heavy (about 25 to 30 kg for the whole thing) but that ball screw still is completely overkill. That's why I'm also using it as a 'guide rod' for the print bed (which in theory isn't very good practice but since it came from a CNC milling center it couldn't care less about the side load). On the other side of the print bed there's a puny 16 mm rod to keep it from rotating.
I'm looking forward to see what you guys do in metal for your hobby!