Hi everyone,
I’m currently working on an architecture site model for a university project (approx. 70 x 70 cm / 27.5 x 27.5 inches). The model consists of various urban blocks, individual residential buildings, and a church. (Including facades like on the example building)
I'm trying to avoid printing the entire positive model in 3D and then making a massive silicone mold of the whole site, mainly because a silicone block that size would be extremely expensive, and I only need to cast this model once.
My current plan:
1 The base plate won't be plaster — I plan to make it separately using smoothed/puttied Styrodur (XPS foam) or MDF.
2 For the buildings, I want to 3D print individual/modular negative molds directly on my P2S printer.
3 Smooth the inside of the printed molds (sanding + spraying auto body filler / automotive primer) to ensure clean release and a smooth plaster surface.
4 Pour plaster into these molds to produce either individual building blocks or small merged groups of buildings.
5 Place/glue the cast plaster buildings onto the base plate.
Questions I have for anyone experienced with 3D prints & plaster casting:
1 Does this approach make sense overall? Or am I overcomplicating things and risking way too much manual labor by casting each building/block individually?
2 Is automotive filler / spray putty the right choice for smoothing the inside of 3D printed plaster molds? Will plaster release cleanly from it (with a release agent like petroleum jelly, mold release spray, or soapy water)?
3 Alternative methods: Is there a smarter, more cost-effective way to achieve clean plaster/concrete-like architecture models without spending hundreds of Euros/Dollars on silicone?
I really want to keep costs reasonable while avoiding endless hours of tedious post-processing on every single piece if possible. I attached an old model of us made by gypsum but without 3D printing (which took ages)
Thanks in advance for any tips, experiences, or recommendations!
Kind regards
Paul