Copied this from a similar question I responded to a while back: I have been using Sketchup 2017 (whatever the last free version was they released) for years to make 3D models for all kinds of purposes, incl 3D printing. For my brain it has proven to be the most intuitive tool to learn, it’s been a really long time so maybe I have forgotten but I feel like the barrier to entry was pretty small. There is a lot of content out there from people giving tips and tutorials. There are plug-ins still flooding around that have really good functionality. I use it with a Connexion 3D Space Navigator mouse that’s prob 10+ years old. That’s been a godsend and adds so much efficiency and flow to the tool.
I don’t know if you can still download it from Trimble but there are sources for it elsewhere.
Have fun, whatever you choose.
Oh that is funny. I’ve had no issues with it, that said, I was content to use a website to convert my .skp files into .stl so I could print but that was less annoying than the learning curve of new software. I tried all the free/OS ones people tend to mention and maybe I’m just an old grump now, but they frustrated me more than just being able to make the thing I’m trying to make and spend no more than 1-2 minutes getting the file uploaded, converted and saved ready to go.
Keen to hear if you find a good solution given we have the same foundation tool. I’d be willing to try a recommendation from someone in the same boat.