Creality K1 Max XY Rails Mod

Description

This mod fixes K1 Max quality issues, namely excessive ringing/echo. It also increases maximum accelerations.

This mod uses MGN12 rails and MGN12H carriages for X and Y axis.

Also, it uses POWGE 7.7 mm belt and corresponding idler pulleys, but you can use 6 mm belt with stock idlers if you add washers to compensate size differences (POWGE idlers have 10.4 mm height, washers 0.2mm (Affiliate), washers 0.3mm (Affiliate)).

You must replace motor pulleys, 7.7mm belt does not fit stock pulleys.

I replaced stock motor pulleys with 20T pulleys for 15mm belt (rotation_distance needs to be adjusted printer.cfg). You will need a bearing puller to do that (some people use printed pullers e.g. https://www.printables.com/model/515503-pulley-puller), you have to be careful to avoid damage to motor shafts. If pulleys sit too tight you can use dremel and make cuts to relax pulleys.

You must use camera mount from this mod, it is 8mm lower than original.

This mod changes print area depending on options you select, beware.

All rails must be cut to have 375 mm between far left and far right holes, X axis rail has max 410 mm total length (375 + 17.5x2 mm), Y axis rails have max 394 mm total length (safe to use 375 + 2x9 mm).

Recommended printing materials:

• Toolhead - PA/PA-CF or similar, ABS-GF
• Other parts - ABS-GF/ABS-CF

Published

https://www.printables.com/model/913734-creality-k1-max-xy-rails-mod

https://makerworld.com/en/models/498602

https://www.thingiverse.com/thing:6667004

License

All work in this repository falls under the Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).

https://creativecommons.org/licenses/by-nc-sa/4.0/

Notes

Partially this work is based on D3vil-Design and Henlor designs.

Photos

Front view

Top view

Motor mounts

Joints

Front idlers

Toolhead

Input shaper graphs

Input shaper graphs for reinforced X axis (20x5mm aluminium sheet + 20x5mm carbon sheet).

N.B. Results for Y axis will be worse (two peaks) when X axis is not reinforced or aluminum pipe 20x10x2 is used.

X axis

Y axis

VFA

N.B. I use 0.9 degree stepper motors - 17HS6401S 0.9 (Affiliate), they are not ideal, hot and have lower torque then original, but I get less VFA.

I would recommend (quite expensive) LDO-42STH48-1684MAC 0.9 degree steppers, they have high torque, low temperature, do not need custom wiring.

eSun Silk PLA

eSun Mate PLA

BOM

BOM contains affiliate links, this way you can support my work if you want.

Front Idlers

Left

front_idler_left.stl

Item	Type	Count	Link
DIN 7991 Flat Head Cap Screw	M4 30 mm	1	AliExpress
DIN 7991 Flat Head Cap Screw	M3 6 mm	4	AliExpress
DIN 912 Socket Head Cap Screw	M3 16 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	1	AliExpress
Heat insert	M3 5x5 mm	5	AliExpress

Right

front_idler_right.stl

Item	Type	Count	Link
DIN 7991 Flat Head Cap Screw	M4 30 mm	1	AliExpress
DIN 7991 Flat Head Cap Screw	M3 6 mm	4	AliExpress
DIN 912 Socket Head Cap Screw	M3 16 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	1	AliExpress
Heat insert	M3 5x5 mm	5	AliExpress

Camera

camera_8mm_lower.stl

Joints

Left

joint_left.stl

Item	Type	Count	Link
DIN 7991 Flat Head Cap Screw	M4 30 mm	2	AliExpress
Flat Thin Wafer Head Screw	M3 6 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 8 mm	3	AliExpress
DIN 912 Socket Head Cap Screw	M3 25 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	2	AliExpress
Heat insert	M3 5x5 mm	1	AliExpress

Right

joint_right.stl

Item	Type	Count	Link
DIN 7991 Flat Head Cap Screw	M4 30 mm	2	AliExpress
Flat Thin Wafer Head Screw	M3 6 mm	2	AliExpress
DIN 912 Socket Head Cap Screw	M3 8 mm	2	AliExpress
DIN 912 Socket Head Cap Screw	M3 25 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	2	AliExpress
Heat insert	M3 5x5 mm	1	AliExpress

Rails mounts

You'll need at least 2 of these for each side.

Left

rail_mount.stl

Item	Type	Count	Link
DIN 912 Socket Head Cap Screw	M3 25 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 8 mm	2	AliExpress
Heat insert	M3 5x5 mm	2	AliExpress

Right

rail_mount.stl

Item	Type	Count	Link
DIN 912 Socket Head Cap Screw	M3 25 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 8 mm	2	AliExpress
Heat insert	M3 5x5 mm	2	AliExpress

Motor Mounts

Left

motor_mount_left.stl

Item	Type	Count	Link
DIN 7991 Flat Head Cap Screw	M3 6 mm	4	AliExpress
DIN 912 Socket Head Cap Screw	M3 6 mm	2	AliExpress
DIN 912 Socket Head Cap Screw	M3 16 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	2	AliExpress
Heat insert	M3 5x5 mm	6	AliExpress

Right

motor_mount_right.stl

Item	Type	Count	Link
DIN 7991 Flat Head Cap Screw	M3 6 mm	4	AliExpress
DIN 912 Socket Head Cap Screw	M3 6 mm	2	AliExpress
DIN 912 Socket Head Cap Screw	M3 16 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	2	AliExpress
Heat insert	M3 5x5 mm	6	AliExpress

Tensioners

Left

belt_tensioner_left.stl

Item	Type	Count	Link
DIN 912 Socket Head Cap Screw	M3 45 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 16 mm	2	AliExpress
DIN 912 Socket Head Cap Screw	M4 20 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	1	AliExpress
Heat insert	M3 3x4.5 mm	2	AliExpress

Right

belt_tensioner_right.stl

Item	Type	Count	Link
DIN 912 Socket Head Cap Screw	M3 45 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 16 mm	2	AliExpress
DIN 912 Socket Head Cap Screw	M4 20 mm	1	AliExpress
POWGE GT2 No Teeth Idler Pulley	7.7 mm	1	AliExpress
Heat insert	M3 3x4.5 mm	2	AliExpress

Toolhead and X axis

There are 2 options for X axis:

1. Rail only - use toolhead.stl

   MGN12 rail can be used on X axis without reinforcement, but it is not rigid enough.

   Bed mesh will likely be less accurate, input shaper graph for Y axis will have at least 2 peaks, there will be vibrations on Z axis.

   There is one benefit - you probably will have print area unchanged.

2. Rail mounted on 20x10 pipe or 20x5 carbon + 20x5 aluminium sheets - use toolhead_20x10.stl

   Print area will be reduced to 284 mm (Y axis).

Aluminium rectangular pipe on X axis

Print several x_axis_frame_20x10_with_rails.stl parts to simplify this process.

Use rail as drilling template, first make mark using 4 mm drill bit, then drill hole using 2.5 mm drill bit, then tap M3 thread.

Item	Type	Count	Link
Aluminium rectangular pipe	20x10x2 500 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 8 mm	7-14	AliExpress

Aluminium and carbon sheet on X axis

Alternatively, you can use 20x5 mm aluminium sheet and 20x5 carbon sheet instead of 20x10 pipe:

Item	Type	Count	Link
Aluminium sheet	20x5 500 mm	1	AliExpress
Carbon fiber sheet	20x5 500 mm	1	AliExpress
DIN 912 Socket Head Cap Screw	M3 8 mm	7-14	AliExpress

Toolhead

Both toolheads (toolhead.stl and toolhead_20x10.stl) use the same set of materials.

Item	Type	Count	Link
Heat insert	M3 4.5x3 mm	6	AliExpress
Heat insert	M3 5x7 mm	3	AliExpress
Heat insert	M3 5x5 mm	4	AliExpress
Heat insert	M3 5x4 mm	2	AliExpress
Heat insert	M2 3.5x3 mm	2	AliExpress

Other parts

7.7 mm belts increase max accelerations.

Item	Type	Count	Link
POWGE GT2 belt	7.7 mm	1	AliExpress
KGT MGN12H + rail	400 mm	2	AliExpress
KGT MGN12H + rail	500 mm	1	AliExpress

Tools (optional)

Things you might need, drill bits, taps.

Item	Type	Count	Link
Hand Tap	3 mm	1	AliExpress
Hand Tap Wrench		1	AliExpress
HSS Drill Bits Set		1	AliExpress