The file 'GT2 Pulley / Idler, 26 Teeth For 5x12x5 Bearing (605ZZ) And 5x11x5 (685zz) 3D Printer Model' is (stl) file type, size is 619.9KB.
For 6mm GT2 Belt
Use 2 bearings 5x12x5 (605ZZ) for this Pulley
I recommend: a Layerhight of 0,15mm, / Speed: outershell 15, innershell 20
===== UPDATE 29.01.2015 ========
I found out that the 605ZZ with 5x12x5mm seems to be a chinese only product. You only find them on AliExpress. So I have added a STL with reduced inner diameter that matches on 685ZZ (5x11x5)
gt2_pulleys_for_bearings.stl | 1.6MB | |
gt2_pulley_685zz.stl | 1.6MB |