I replaced a cracked shin guard with a 3D printed version. This was done for the Michigan Tech course MY4777. The plastic for a set of shin guards would cost $1.32. The shin guards were purchased for $15.90 from Dunhams. This is a cost saving of $14.58 (92%).
It took approximately 1 hr and 45 minutes to print one shin pad. It took another 0.5 hr to sew the plastic onto the fabric.