3D-printable replacement for the X-axis metal wheels
Hi, all.
So as you probably know, the Kobra 3 (as well as the Sovol SV06) use metal wheels on steel rods for the X and Y axes. These are SG15 bearings and still aren't very common (I could be wrong but I think the Bambu Labs A1 was the first mainstream printer to use these on the Y axis).
I've whipped up a 3D-printable model of the SG15 outer wheel that can be fitted to two flanged 625 bearings. I can't comment on how well it performs as I don't own these printers (but I'm making a modification to one of my current printers to convert it from POM wheels to supported rods).
I would recommend this more as a temporary replacement whilst waiting for genuine parts, or for prototyping purposes but do make sure to randomize the seams!
https://www.printables.com/model/1112236-sg15-u-groove-wheel-625-bearings
Note that the picture is actually of a printed SG20 bearing as I was having trouble getting a good photo of the smaller SG15.
On a side note, its actually a pretty smart way that the manufacturers can retrofit POM wheel-on-extrusion systems as you can essentially just slap a couple of 6mm rods into the V-slots of the extrusions, swap the POM wheels for SG15s and you're done - don't need to redesign anything else
