Sienci's LongMill MK3 keeps leadscrews but adds HR15 linear rails, closed-loop steppers, and faster rapids, with preorders May 26 from about $1,400 USD for the 30×30.
Sienci's AltMill automatic tool changer costs $2,890 for a 6-tool kit or $3,340 for 12 tools, uses ISO20 holders with ER20 collets, and needs 220 V and a shop compressor.
Sienci's AltMill 4×8 starts at $7,490 without a spindle, uses a joined rack and pinion on the long axis, and opens preorders October 29 for about 150 machines.