SMT Solder Paste Stencil Printer Table, no support is needed, but with lots of heat insert nut. I don't insert all the nuts in the photos, but you know the meaning.

You must use a frameless SMT stencil, which you could order from PCBWay or Aliexpress. The PCB size limitation is around 14x14cm, having 1.0mm, 1.6mm, and 2.0mm PCB thickness adaptors. I've tested PETG-CF filament, but I think PLA should work too.

BOM:

• ~150x M3x3x4.2mm Heat Insert Nut (M3 thread with 4.2mm outer diameter, 3mm length), like the ones in the photo
• ~20x M3x6mm Hex Socket Head Screw (for block setting)
• 2x M3x10mm Hex Socket Head Screw (for hinge)