@p12

Printed parts are weaker across layers. Folklore says by half; tests say a tenth to nine tenths. What a bond is, what moves it, and a coupon to measure it.

Vendor guides say 5 mm, torture tests say 100. What a bridging strand is doing, why slower is not safer, and the coupon that measures your machine's limit.

The Pattern 3D node and its 150+ families, bounding a lattice with an Intersection, scale and precision trade-offs, and the Infill and Surface Pattern steps.

Wall thickness is set by the nozzle, not by a rule of thumb. Why two perimeters is the real minimum, where strength comes from, and what to calibrate.

The 45 degree rule measures how much of each layer the one below supports. The geometry behind it, why layer height moves the limit, and how to design past it.

Clearance belongs to the printer, not the design. Why printed holes come out tight, how to read diametral against radial, and the test coupon that settles it.