I didn't have a 3D printer I could use for free, and I had a PRUSA i3 MK3 kit which I procracinated to assemble.
This week my lab mate and I built it and printed component parts after some design tweaks.
I bought rods
and collars from Amazon.
The edges of the rods are roughly cut and the collars didn't go thourgh. I sanded the edges.
We must hold it this way.
This is no-no.
This lead-screw looking parts are for lifting loops up and down. Working nicely!
But when holding the loop, the loop exceeds the groove. It seems necessary to deepen the groove.