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SEM of top 3DP surface for 30 wt% PEEK/HA composite at (a) ×10 k and (b) ×30 k magnifications. SEM images (c) and corresponding (d) Ca and (e) P elemental maps for 20 wt% PEEK/HA sample, (f) photograph of 3DP spinal fusion implants with 20 wt% PEEK/HA.
