During the building process, which method could experience issues with squeezing lower layers due to weight?

The method that could experience issues with squeezing lower layers due to weight is Fused Deposition Modeling (FDM). In FDM, melted thermoplastic material is extruded layer-by-layer to build up a part. As each new layer is added, it can exert pressure on the layers below, especially if the part being printed is tall or has significant overhangs. This weight can lead to deformation or squishing of the lower layers, potentially affecting the dimensional accuracy and structural integrity of the final print.

In contrast, other methods like SLA (Stereolithography) and PolyJet utilize light or resin curing processes, meaning that layers are built up without the added mechanical weight of new material pressing down on lower layers. Binder Jetting also operates by depositing a binder into a powder bed, where layers are packed without the weight of extrusion. Each of these methods has different mechanisms of operation that do not introduce the same weight-related issues seen in FDM. Thus, it's clear why weight-related concerns would specifically affect FDM during the building process.