LM8UU with bed  LM8LUU short rails
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LM8UU with bed & LM8LUU short rails

Linear bearings for the CTC i3 Pro The LM8UU with the 5mm bed holes 32mm separation The LM8LUU is modified a bit as models ...

similar models —

LM8UU with bed & LM8LUU short rails alternatives
Lego rails uphill
MiroDesign
Rail Cap
wgbarry03