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Thank you! There are pros and cons. The major negative on the openbuilds vs 12mm hardened rods is cost. The rod route is cheaper by quite a bit. The major upside is the openbuilds mods do give you better dimensional accuracy. Much better than 10mm rods, slightly better than 12mm. I actually have a 12mm y axis rod project somewhere in there for a 6 bed. The amount of weight you can have on the taz openbuilds bed is significantly higher than what you could have on the 12mm rods, but unless you are printing very large metal fill objects that's not a concern for most people. The boxed structure does serve to entirely eliminate side sway caused by the slight offset in the bed belt anchor positions, the 12mm rods might not. If you took a page from the mini 2 and added endpoint compression bolts to compress the rods that would likely have the same effect. If you go 12mm rods dont go with the ball bearing slides, they chew things up a terrible amount even on hardened shafts. Bottom line i would go with the openbuilds mods over the 12mm rods, and have with all four of my taz units. I dont think thats just creator bias on my part. Even the hardened rods are still unsupported in the middle. The bed is more important to consider the rails over the rods if you were only considering one axis if we are talking 12mm rods vs openbuilds. If we are comparing the stock 10mm rods the x axis becomes much more important to retrofit. The main differences you would see are in the consistency of the layer thickness in Z and y axis definition. As to which is more difficult, probably the openbuilds one unless you buy a predrilled bolt on kit from someone like me, in which case it's easier. Drilling the bed is the only tricky part above adding rails, assuming you would have to cut rods to final length and or design parts that don't yet exist to accommodate them. Hope that helps!