GuideHardware
3D printing replacement parts: what works, what lasts, what is legal
Printed parts are weakest across layers: Bambu Lab PETG Basic pulls 51 MPa in XY and 35 MPa in Z; Prusament PETG's interlayer adhesion is 18 MPa against 47 MPa flat.
Tagged “reverse-engineering”
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AnswerHardware
How to match tolerances on a 3D printed replacement part
Design in clearance instead of copying the measurement: 0.15 to 0.20 mm for a snug fit, 0.20 to 0.25 mm sliding, 0.30 to 0.40 mm loose, then check with a tolerance print.
AnswerHardware
How to measure a broken part for 3D printing without a scanner
A digital-caliper procedure for outside, inside, depth and step measurements, with Mitutoyo's ±0.02 mm accuracy set against Prusa's 0.3 mm printer tolerance.