Shimano bottom bracket adapter

thingiverse

Bottom Bracket Adapter, Equivalent to TL-FC25 Attaches Smaller Diameter Shimano Bottom Brackets Using a GxP Wrench. The adapter's inside fit is snug, but loosens with use due to its solid wall design on one side, facilitating BB cup removal if stuck. Print Settings: Printer: XYZ Jr. 1.0 Rafts: None Required Supports: Not Needed Resolution: 3mm Infill Percentage: 90% Notes: Simply rotate the adapter so the opening faces upwards; no supports are required. The design feels solid when printed with PLA. Design Process: I measured tool and Shimano bottom bracket diameters, then created a radial pattern of notches in Fusion 360. A test print resulted in outside notches that were too small, prompting adjustments to increase notch diameter, add fillets, and offset by 11.25° for added rigidity.