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

Flagship K Series Creality Flagship K1 Max
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1

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 : 💭 Creality K1, K1C, K1MAX Full Linear Mod (LiDAR and CFS compatibile) - No Root Needed!・ 3D File for 3D printing・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_163827
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?

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@Fifi
I was on holiday but now read your post/

No room for your 5mm at the sideglider X axis because that would make the print field smaller.

The toolhead moves all the way to the side brackets.

No issues here it is running smoothly and I have great print results.

5

I would like to do this upgrade as well at some stage. Thanks for the post

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6

I’m working on this mod, but I have CFS, and some details in the project could be improved. With CFS, the filament cutting is mechanical, and when it cuts, the belt skips a tooth. If I tension the belt a lot, the cut is correct, but the X-axis becomes misaligned because, even with the same belt tension, the carriage will never have the same friction. The rail housing is tight, but the 1.6mm wall thickness and the fixing with only one screw don’t prevent twisting. I’ve already done some prints with the machine, and the quality is absurdly better; the top layer came out smooth, looking like the first layer. The mod is very good, with this small detail. I already have some ideas to fix this detail and I’m working on it. As I work with engineering materials, I need the machine to be square. I have Root, but I don’t want to rely solely on the software’s squareness.

2 Likes