I meant the smooth rods, I’m wondering if they might slip out.
Seriously though that printer @aze aze linked, https://github.com/lautr3k/RepRap-iTopie It actually looks perfect to me. I only built this because I was super unhappy with what was out there, for the prices they are offered at. I looked for a milled printer and did not find anything even decent. That itopie looks absolutely perfect to me.