SD4 Lawsy's carriage upgrade question

use the STLs in the sticky and read this for sd4:

http://www.soliforum.com/post/72175/#p72175

edit: ah you want to use the original extruder. yeah that modified x carriage will work. link is still relevant though.

I had to replace my smooth rod, too.  The LM8UU was too tight on the originals resulting in a rough, gritty feel.  Bought some hardened smooth rod on eBay and they now glide very smoothly.

I highly recommend you to change your rods. I was struggling to get my bed level on my sd3, until i swaped the carriage for the lawsy, and changed my rods... Come to find out, my original rods were not straight !!! now I have no leveling problems any more.

Also, your original rods are imperial size. they are a little over 8mm in dimension, I don't remember the exact size in imperial, but they are bigger. And on top of that, the old rods are hard to extract from the old carriage without braking them.

Save you some hassle, and the rods are not very expensive, you definitely need to go for it.

I confirm as well that lm8UU are not all the same ! they are cheap linear bearing, and so, their tolerance are not consistent. so you should get some spare to be sure everything slides smooth.

Original belts and pulleys are just fine

Good luck with your mod, you're gonna love it !!!