While TinkerCAD, Fusion360, OnShape, and a few others are commonly suggested to first timers, there's another system I'd like to suggest to someone who wants to work in 3D, specifically in order to make prints and start from square one. It's called Orchard, and while it's still a bit sparse currently in terms of features, the bones of a modeling suite are definitely there, and its primary goal is to introduce newcomers to the basic ideas of 3D modeling, so it may be a good starting point for you.
!thanks
Alas the Windows machine is 32bit, so no Fusion 360! I can use FreeCad but already in the first few minutes I can't find the obviously primitive shapes tools I'm after! (I will take a look at a couple of videos).
Yes saw that about Onshape and saving private files. However I just also discovered Orchard 3D which is also a web app. It's very intuitive with some start up training articles and videos. There's three developers working on it now and I think they may be revamping a previous project. It appears to be free at the moment. Already they've been answering questions directly and asking for feedback. The system is a bit different than TinkerCad but has the primitive shapes, with the basic fillet and chamfer I was after! So, so far so good.
No problem! I'm just happy to get their name out there, they definitely seem to be having trouble getting to that "critical mass" point of users. If you want a pretty good demonstration of some of the features it already has, there's a collaboratively built i3 derivative on their front page that's pretty interesting, using some elements of the Wanhao Duplicator, and some from the standard framework and/or i3 MK2. It also demonstrates the timeline feature quite well, allowing you to step through the design process that went into it.