K1 max Full linear X and Y rail MGN12 upgrade (no rooting needed)

Flagship K Series Creality Flagship K1 Max
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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 :

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20250102_1638271920×2560 528 KB

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20250104_1749181920×2560 334 KB

20250104_222617
20250104_2226171920×2560 425 KB

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I approve of this type of mod :slight_smile: I shall be off to eBay to find a secondhand machine :slight_smile:

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I think the kit looks really well-designed and clean. I just have some doubts about the left-side mount where the X-axis is supported — it seems like there’s not much material reinforcing the idler pulley. Do you think there’s enough room to widen that part by a few millimeters, say to 5 mm? Or would that risk colliding with the endstop or interfering elsewhere?

Also, does the toolhead move all the way to the side brackets, or is there still some clearance left? Have you run into any issues so far, or is everything still running smoothly?