Try these best cost effective quality rods I could find, I'm using them. I believe they're hard chromed tool steel optical linear shafts.by RicerX1 - General Mendel Topics
I would say too much extrusion check your extruder E steps and/or the filament diamenter And then use a caliper and measure your filament in a few places and average it.by RicerX1 - General Mendel Topics
If you were the same seller on ebay selling the carbon frame then I got my frame from you. Story sounds the same. The frames are of excellent quality. The carbon is very strong but it is more flexible then aluminum. It does not seem to affect print quality but I haven not printed anything over 50mm tall so I don't know if there will be negative effect as the z height gets taller, But I wouldn'tby RicerX1 - General Mendel Topics