As an engineer, I make a lot of my own 3D designs.
Stuff I've made
Printables Profile-Washing Machine Door Latch
-Dishwasher parts
-Various Adapters
-Aquarium Parts
-Phone mounts
-LugCap covers
-DnD Dice Cases
-Custom Measuring Cups for 1 scoop
-Flexible Shower Head holder
Stuff I've printed from the internet
-Vacuum Cleaner/Shop Vac attachments
-Planters
-Broom Holders
-Yeti Mug Cup Holder
-Extension Cord Rack
-Fishing Rod Holders
-Cleats for my outdoor projector screen
I've got an Creality Ender 2 but I am going to get a new printer for Christmas that does all the auto leveling stuff because I hate having to do all that by hand. I also need a direct extruder so I can get into different print materials. Either getting Bambu or Flashforge. I've got a friend that brought his Flashforge on the Texas A&M training ship and we printed all sorts of stuff for the ship. They're trying to justify to the school or the government that subsidizes the ship to buy 3D printers to have onboard.
I use Shapr3D since I have a free EDU account from temporarily working at Texas A&M, but I will have to find an alternative software soon. Solidworks sells a Makers subscription for $50/yr.