Sorry, but with the translation I don't know if I got it right ... ☺️.... I don't know what you mean, but the stirrup you show in this post, is the same one I printed, I chose the 20mm diameter tube because it was the best taking into account the cost, calculating that I will have to mount it for 250 coils.
In this regard I would like to ask you: I would like to mount 3 brackets with a D.20mm x L.2 mt aluminum bar .... do you think it could be correct? I would also like to ask you if you can advise me, how much space should I leave between a row and the one above?
Thank you so much for the support...