My first printer was an Anycubic Vyper and I feel like it was pretty perfect for my beginner self. I was abke to put it together, do some very minor tweaking, and got it running decent quality with minimal to no issues. There’s also sales regularly on their site. I picked one up for 250 USD. And their customer service is truly spectacular. Once I started tweaking the printer for quality I found a few minor issues about a year and a half after purchase. They sent me replacements and I got them within a few days.

For your use case, it may be pretty good.i ended up changing/modding quite a bit eventually on it but I didn’t need to if I wanted to go with just printing test and consept parts.