As a poor Nerd with only a moderate dev budget available to me, much of what I have is broken/cast off equipment, brought up to spec (In my own way).
I have the 2 Ender 5 units. Both are all linear, orbiter converted, Klipper machines, frame reinforced, adaptive mesh, input shaping, and a tune for 120-150 mm/s. I stayed cartesian, because it keeps maintenance to almost nothing, lowers part count significantly, and is “Fast enough” for my use cases. My Ender 5+ is similarly setup, but has a Microswiss allmetal head instead. I use it mostly for flexibles. My Ender 3 Max, is totally custom. Top down. Dual Z, Klipper, Color Touch, Runout sensor, Mosfet bed control, upgraded power, cooling, and has an auto eject system similar to my loop-elec system in design for it. The CR10S5, has been modded to the sky. Custom SKR electronics box, Mains controlled 1500 watt edge to edge silicone hotbed, Microswiss, runout, XY linear Rails, Frame Supports, Dual Z Sync, on a custom stand, with the bed hand/bent corrected to .22 diff edge to edge. I also have a Prusa MK3S+ with MMU3 and my own redesigned version of the MCS system for material management. As well as a friends donated K2+, that I use for nothing but rapid prototyping. Its dimensionally terrible, and first layer issues have plagued it since shipment. It works. And gives me a quick “See if this fits” part. Bout all its worth. I have a very nice Electronics rework and PCB fab space, with a Custom built Reflow Master Pro controlled reflow oven, hotplate station, 10" HD inspection scope with 2500x mag, Revopoint mini scanner station, Kiri Engine Pro Lidar Scanning, with Climate and Humidity control in both rooms, and Automatic fire suppression, and HD Cameras, watching every bed with AI failure detection set to notify me on my cell if anything goes wrong. These machines run nearly 24 hours a Day. I get my shop space for free for doing design work and part production for a Custom Wheelchair and Rehab Equipment shop here in Florida. (I design custom wheelchair and QoL improvements and parts, mostly for kids wheelchairs, standing chairs, traction systems/chairs, rehab tables and equipment, Etc) After 5PM, and on Weekends, the shop is mine to make whatever I want. Once in a lifetime scenario. Taking FULL advantage ;-D