I wound up using TurboCAD Pro Platinum 2018, definitely not free but I find it quite good. I started out with AutoCAD after taking a class in it, but then when it went to the Windows version my nice drawing tablet with all the macros and buttons on the puck no longer worked. So I mailed the original disks in for a super discount on TurboCAD. Now I upgrade from time to time when a customer job needs mechanical design and I can have them pay for the upgrade.

I draw essentially everything in 3D, it was hard for me to switch to 2D for our house plans. I started with full 3D but had to switch because it was taking too long and the contractor was grumbling louder and louder.