Apple 2024 Mac mini Desktop Computer with M4 chip with 10‑core CPU and 10‑core GPU: Built for Apple Intelligence, 16GB Unified Memory, 512GB SSD Storage, Gigabit Ethernet. Works with iPhone/iPad

If you are fine with macOS, I would take the Apple 2024 Mac mini M4. It should handle Bambu/Orca and lighter Fusion/Shapr3D well. For heavy Plasticity, look at a Windows box with more RAM/GPU instead.

Amazon is putting some mac minis on special this week. This is not the killer high-end stuff but if you're looking for something basic https://www.amazon.com/dp/B0DLBX4B1K/