I'm building a new ToM and that I just have 8mm rod and LM8UU leftover from my Prusa Mendal. So I design an adapter kit to convert Makerbot from using 3/8" rod and bushing to 8mm rod and LM8UU linear bearing.
It will fit on standard wood ToM and work pretty well on my new acrylic tom too.
Print two pair of X-rodCoverInner/Outer parts for two side of x-stage.
Print 1 X-support-Lm8uu and snap two LM8UU and 3 nuts in to part.
Print 1 Xrod_mount_623_8mm and bolt three 623 Bearing on this component. This part is change from carmiac's X-Axis Follower (http://www.thingiverse.com/thing:8162)
Print 8 of YZ-rodCoverInner and press 4 nuts into one side. This component will install in the inner part of rod end.
Print among Y-Lm8uu vertically. Remove bottom and inner support wall. The part should be symmetrical. Put two LM8UU into parts clamp this part in the Y-stage.
Print among Y-support_8mm. Install three 624 bearing and three nuts on the part.
Print two of Z-Lm8uuHolder. Use 8~9mm drill into clear middle wall. Snap two LM8UU one top and bottom.