I made the X and Y Axis modification/upgrade by installing linear rails MGN12 on my K1 max.
The needed parts I downloaded from cults3d, a design made by “lashigt”, see : 3D file Creality K1 MAX Full Linear Mod (LiDAR compatibile) - No Root Needed! 💭 ・Model to download and 3D print・Cults
The printing results are great ( no VFA anymore on your prints) and a big improvement of the K1 max to a machine of industrial quality without having to root the machine.
There is a set for a not rooted machine and a set for a rooted machine too.
Key components to buy :
Adjustable Gear 20T (5mm inner hole) 2 or (when reusing stock teethed motor gears) 0
Bearing 5mm (reuse from STOCK MOUNTS) 2
Bearing F623Z type 3x10x4 (4 pcs) 4
Bolt ISO 10642 M3 x 10 4
Bolt ISO 10642 M3 x 16 2
Bolt ISO 10642 M3 x 6 4
Bolt ISO 10642 M3 x 8 8
Bolt ISO 10642 M5 x 40 2
Bolt ISO 4762 M3 x 16 10
Bolt ISO 4762 M3 x 25 2
Bolt ISO 4762 M3 x 30 6
Bolt ISO 4762 M4 x 16 1
Idler Gear 20T (3mm inner hole) 2
Idler Pulley (3mm inner hole, OD 15mm) 6
Idler Pulley (5mm inner hole, OD 15mm) 2
Linear Carriage MGN12 3
Linear Rail MGN12 L = 400mm (Z1 Class, or similar) 3
Nut ISO 4032 M3 6
Nut ISO 4032 M4 2
Nut ISO 4032 M5 1
Spacer ISO 7089 M5 4
Spacer M3x06 26
Voron Heated Insert M3 D=5mm L=5mm 25
Self to print the downloaded components in ASA filament.
here some pictures of the proces :
I shall be off to eBay to find a secondhand machine