I used the MGN9C series rail/block for the Y axis to replace the center mounting rollers. I printed the bearing block spacers to about 18mm high in order to keep the printer bed’s original height and belt track spacing. Other than that, I added the 3mm steel plate to finish the mod.
Maybe my 3mm steel plate was not completely flat, but I did have to play with shim thickness on the printed bearing block spacers to keep the rail motion smooth. I have no way to mill the plate and might consider an aluminum plate if I was to do it again.
The bed leveling nuts take a bit of a balancing act to get them started on the stud because of the linear rail’s location. I also replaced the bed leveling springs with silicon mounts.
When I first got my SV04, after the initial builds, I wanted to add a linear rail, especially to the X-axis. (This was due to a loosening issue with the X-axis Vslot wheels.)
From what I see, you added one to the Y-axis. Did you have a similar experience with the X-axis?
Generally, what should be considered when adding a linear rail?
(I don’t know English. I’m writing using Google Translate. I apologize for the poor explanation.)
I added the linear rails on the Y Axis to address the bed constantly needing leveled because of the center rail axis wheels (under the bed) not being able to hold it’s position. I do check the bed for level now, but I find it very stable. I don’t need to adjust level very often.
I also purchased a few M3 half-round T-slot nuts for 20x20 profile to hold the rails down.
The MGN9 C rails hole spacing lines up exactly with the SV04’s rails.
After I added the linear rails to the Y axis, I thought about adding them to the X axis, but was not sure how it would work out with the belts plus I think that axis is fairly stable on this printer. Maybe I have my X axis wheels adjusted too tight.
I would be interested if you could update this thread after you finish your mod. Thanks.
