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If you have a lathe - use that. If you do not have a lathe use a milling machine with a boring head. Drill hole to close to required dimensions. Bore the hole out very slowly if you do not have reamers. You need some kind of boring bar that your boring head takes. You don't need to cut...

This is almost double what it costs new.

So I offered $2 per lbs in Calgary for 4140 and 4330 for past 5 years. Discounts for larger amounts...

Seems OK price - nothing special - would have purchased one if I did not make one already like 2 or 3 years ago.

I paid about 150 or so for a Baldor 3hp grinder 10" about 7 years ago. It was on auction. Seen them go for around 250 today.

Maybe my printer is slow - its like 2 years old? My filament is 151g but for all 45 is around 1kg. Should I try Sovol cura?

https://we.tl/t-5boQu6ODGV my cura project and generated gcode https://www.printables.com/model/573010-modular-er32-collet-rack-tray-stand/files I used first STL file x7 times. I.e. I print 7 at a time.

Grid is for 45 collets. settings are 1mm shell and 10% fill. I am printing 7 at a time and that is over 18h.

So I did the slice and after playing with parameters it works out that it will be for my collets about 1kg of filament... so about 20 CAD unless someone has cheaper source of filament out there. This is for ER32... maybe I have too many collets? It will also take a week to print.

Here is cheapest steel one from ali for just $26 including shipping...