is it possible tu use alluminium pipes with 20mm OD? If not, what is the minimum diameter?
Sorry, but that OD would be too small for both the 23.5mm and the 25.0mm builds.
So to answer your question the minimum would be 23.5mm OD.
Which country are you from Nicola? Maybe there are others here with the correct size tube
on here that could help you source your rails!
Thanks for your answer. I’m from Italy.
I’ve found only plumbing pipes of such dimension (at Brico centers), but I’ve read in the forum that they are not ideal for building the cnc.
Are there others from (north) Italy?
For others living in Italy: I found 25mm x 3m galvanized steel pipes at “Sacchi Elettroforniture” for about 6 €
Just to add an information for others living in Italy, I’ve built my mpcnc using 25mm x 2mm pipes from “Comet”.