I have a Creality CR10 (no S), but I'm about to upgrade it to a dual-Z using one drive motor.
I also have a Wanhao Duplicator 7 and an Ender-2, though the Ender hasn't been assembled yet.
My next printer will be an SLA printer that comes in kit form; a Peopoly Moai, but that will need to wait a while.
I'm trying to decide if I should install the new multi-out print head on my CR-10 or wait until I build a DIY printer for that.
Nice work there.
I personally recommend Blender for your own models, although it has a steep learning curve. There is a lot of help on this forum to help you get used to it.
I personally use 3ds Max.
I plan to improve the TWOK ranks I have on Thingiverse. All I really need to do is make them thicker. They're a bit thin right now.