; homez.g

M906 X800.00 Y800.00 Z1600.00:1600.00:1600.00:1600.00 U1600.00 V1600.00 W1600.00 E500.00 I50

G91
M584 Z6 U7 V8 W9 P6 ; split Z,U,V,W

M906 X800.00 Y800.00 Z1800.00:1800.00:1800.00:1800.00 U1800.00 V1800.00 W1800.00 E500.00 I50
G4 P500
G1 Z380 U380 V380 W380 F4000 S1 ; move up to 380mm in the +Z direction, stopping if the homing switch is triggered

G1 Z-4 U-4 V-4 W-4 F1600 S2
G1 Z10 F700 S1
G4 P500
G1 U10 F700 S1
G4 P500
G1 V10 F700 S1
G4 P500
G1 W10 F700 S1
G4 P500
G1 Z-4 U-4 V-4 W-4 F1600 S2
G1 U0.1 F700
G4 P500
G1 V0.5 F700
G4 P500
G1 W2.4 F700
G4 P500

M584 Z6:7:8:9 P3 ; join U,v,w to Z again
G1 Z-200 F3000 ; move back again 10mm in the -Z direction
G90 ; back to absolute mode

M906 X800.00 Y800.00 Z1600.00:1600.00:1600.00:1600.00 U1600.00 V1600.00 W1600.00 E500.00 I50

Forget the g4, it's not useful.

I have a corexy with 4 motors and did the same thing with another method. My bed is stationary but it is the same concept.

Probe the bed, check the differents z offset per axis.

In my home z, i have:
Split the different z axis
Home all axis.
Lower the frame at 10mm
Move every axis with your mesured zoffset
Join all axis in your z.

I even removed my z probe. This method works for me. There's probably a better way, but was not able to find it

I can show you my homez if you want

@fma

With only a drill (and a screw), you could have a u shape.

@zapta I received the board.
The pump starts smoothly at 20% and is at full speed at 92%. Far better!

Thank you very much...

@zapta
I'm interested to buy one too.

I've got a 24v pump that don't like pwm...

I had the same problem. My bed is stationary but the XY gantry moves up and down. I have 4 stepper. I went the counterweight route. I melted 4x1 kg lead blocks.

I wanted to use some springs but the strength change with the position in z.

@lael nope, no leakage. But in my opinion, it would be better to have a real fitting. I'm gonna change it soonish.

@paulhew i have built a printer using this kind of design. You can build it without being overconstraint. But you need to think about each z axis as independant axis. My 2 y axis are fixed in the back and they are just put on the front z axis.

You can't really make 4 identical z axis.

But it's somerhing you can make.

For my printer, it was easier to keep the bed stationary. 7kilos is enough...

@o_lampe

Copper tubing is easier to find than brass tube...

@mrehorstdmd

The tubing isn't copper in my watercooling, but it will be...

But i need to find a way to solve the galvanic corrosion.

@fma said in Z axis: ball screws vs belts:

Does small gaz cylinders exist, like for car rear tail-board?

Yep, you can find these in any length, but their power is different along the length.
Think of them like a spring.

I went the other route, with belts and counterweights...
1 kilo per belt.

Works nicely, no more falling without power.
I used brake cable for bike with wheels because the tubing had too much friction.

@theruttmeister
I agree with you, the watercooling is overkill. You can have a single line with a 120 fan easily.
I put a watercooling with a 40x40 fan on a aluminium heatexchanger for the hotend and the extruder. The temperature stays at 25 deg max.

watercooling2019.stp

the step files of the effector with the cooling block
And the picture of a maxiwatt hotend with the thermistor