608 bearing (parametric, roller)

thingiverse

Printable 608 Bearing This isn't a print-in-place bearing, those are fun but necessarily quite loose. If the bearing is assembled from parts it can be much tighter, almost resembling a real bearing. Looking for a print-in-place bearing optimized for 3d-printing? Check this out: https://www.thingiverse.com/thing:3240362 ## Parametric Model STL files included are for an 608 or 8x22x7 bearing, but the FreeCAD model is completely parametric so any size can be set, including clearance between races and rollers. This model is optimized for small bearings; larger bearings might do better with this variant: https://www.thingiverse.com/thing:3576371 ## Printing No support needed. Print rollers with a brim if they don't stick to the bed. Small bearings could have this problem, but larger ones shouldn't. Set 'seam position' to random for round parts as possible. If an 'elephant foot' forms, trim it away from roller ends and cage holes so they roll freely inside the cage. Trim obvious blobs from races and rollers before assembling. Start with just rollers without brim to avoid reprinting everything if they don't stick. Lowering perimeter and small perimeters speed helps with printing loose pieces. 'Avoid crossing perimeters' (slic3r setting) or similar could help too. ## Assembling 1. Place the 'jig' inside the outer ring. 2. Put rollers side by side against the outer ring on top of the 'jig'. 3. Fit the inner ring into the bearing, also against the outer ring. 4. Press the inner ring sideways into its place in the center of the outer ring. 5. Remove the 'jig' and spread out rollers evenly. 6. Put the cage in place. 7. Snap the cage top onto the cage pillars one at a time using fingernails or some object that fits. ## UPDATE 2019-04-28 Switched to FreeCAD 0.18, found errors in the model. New version uploaded. ## UPDATE 2019-05-20 Added an STL file with an even tighter bearing version. Try this if the other one is still too loose.