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KOSSEL DELTA manual calibration in Repetier (last update 17-01-2017) by Mind Map: KOSSEL DELTA manual calibration in Repetier (last update 17-01-2017)
5.0 stars - 3 reviews range from 0 to 5

KOSSEL DELTA manual calibration in Repetier (last update 17-01-2017)

X-Y dimensions correction and CURVATURE CORECTION influence

This is what complicates calibration on delta printers.

When we change "Diagonal_rod_lenght" it influences curvature and when we change "horizontal rod radius" we change XY movement.

That is why we need to check bouth when we are calibrating.

If we are gonna print toys and vases we can only focus on curvature corection. But if we are gonna print parts for other machines we need both.

temp (not finished yet)

MOVEMENT CURVATURE CORECTION: Standard 4-point delta calibration MEASUREMENT

Put paper in the middle of glass.

Manually drive hot-end so low that you feel nozzle stoping the paper (Point 1) OR use Script 1.

If you reach may down position (Z=0) increase Zmax in EEPROM.

Go to Point 2 manually OR use Script 2.

Go to Point 3 manually OR use Script 3.

Go to Point 4 manually OR use Script 4.

Lets look at the numbers! Ideal is that ALL are as close as possiable!

Delta printer kinematics

X, Y and Z directions on delta printer:

Delta

Zoom

Test end-switches

In Repetier use code M119 for getting status info

test all 3 to see all are electricaly OK

this must be confirmed before using first HOME command

In Repetier EEPROM settings

Alt+E

Steps per mm: 200 (if DRV8825 drivers are used)

Homing feedrate

Homing speed

Extruder 1 - steps per mm

Mechanics - constants

Print size/volume

XXL

Hi You get two types of effector. One is better for max print height (effector with hot end on top) and one is better for PLA (has better plastic cooling). ------------------------------------------------ rods length = 410mm effector with hot end on top Zmax = cca 400mm print diameter = cca 320mm effector with hot end below Zmax = cca 345mm print diameter = cca 320mm ------------------------------------------------ rods length = 475mm effector with hot end on top Zmax = cca 375mm print diameter = cca 375mm effector with hot end bellow Zmax = cca 322mm print diameter = cca 375mm ------------------------------------------------ rods length = 500mm effector with hot end on top Zmax = cca 348mm print diameter = cca 375mm effector with hot end below (print diameter = cca 375mm) Zmax = cca 295mm print diameter = cca 375mm ------------------------------------------------ Danijel

GENERAL IDEA

What is calibration of 3D delta printer?

Enter/edit scripts

Enter scripts

Script 1- CENTER

Script will move nozzle 10mm over glass (Point 1) and then lower to 2mm over glass.

Script 2 - X tower

Script will move nozzle 10mm over glass (Point 2) and then lower to 2mm over glass.

Script 3 - Y tower

Script will move nozzle 10mm over glass (Point 3) and then lower to 2mm over glass.

Script 4 - Z tower

Script will move nozzle 10mm over glass (Point 4) and then lower to 2mm over glass.

DRV8825 stepper driver

set poti voltage to 0,6V to limit the current

Current Limit = VREF × 2

So, for example, if you have a stepper motor rated for 1 A, you can set the current limit to 1 A by setting the reference voltage to 0.5 V.

X-Y dimensions correction

In general:

Standard 4-point delta calibration SITUATION NO.1 - JUST ONE POINT IS OFF

Correct it by moving end stop lower or higher

Measure all 4 points and write it down.

Better?

Standard 4-point delta calibration SITUATION NO.2 - HEAD WANTS TO GO LOWER IN THE MIDDLE

Table

Situation

Decrease HORIZONTAL_ROD_RADIUS in EEPROM settings.

Home printer.

Measure all 4 points and write it down.

Repeat the proces ...

Standard 4-point delta calibration SITUATION NO.3 - HEAD WANTS TO GO LOWER ON THE SIDES

Table

Situation

Increase HORIZONTAL_ROD_RADIUS in EEPROM settings.

Home printer.

Measure all 4 points and write it down.

Repeat the proces ...

Standard 4-point delta calibration FINISHED (ALL DISTANCES ARE SAME)

Table

In the above situation offset Zmax in EEPROM for the same number. So decrease for 1,2mm the number that is there.

Measure all 4 points and write it down.

They should be 0 or very close to 0.

Real life example

Table - 1. measeurement of 4 points

Point 4 (Z tower) number correction.

Here the nozzle is going lower than on X and Y points. So we need to rise Z tower end stop.

Table - 2. measeurement of 4 points

Better. But I need to do lower it more.

Table - 3. measeurement of 4 points

Better again.

lower X end stop - 1/4 screw turn rise Z end stop - 1/2 screw turn

Table - 4. measeurement of 4 points

Now tower are OK

We have concave nozzle movement. So we need to decrease HORIZONTAL ROD RADIUS parameter in EEPROM.

Repetier > Config > Firmware EEPROM Configuration

ALT + E

Was 170. Decrease to 168.

Table - 5. measeurement of 4 points

Better. Need to decrease more.

Was 168. Decrease to 166.

Table - 6. measeurement of 4 points

Almost perfect. Gut enough for me.

End-stops positioning

Why do we need it?

When there is need to move end stops here is how you do it

Zoom

How do we use them?

Use this when making calibration.

Extruder calibration

This calibration is much simpler.

Our gool is to extrude correct length of fillament.

EXAMPLE:

Z-height calibration (hotend/nozzle in center position)

Measure distance between nozzle and bed (glass) when hot end is in Home position

about 258mm on my Kossel XL

We need this distance to start setting Z-height

EEPROM (Alt+E): Z max length: change existing number with measured one + 2mm

262mm in mine case.

Put the paper over glass.

Manually move nozzle so it touches paper (bed center)

In my case Z position it was 1,2mm.

Manually move nozzle left/rigt (X direction) to see what is it doint.

In my case it moved a bit up when moved to X+120 and X-120 position

This means  I need to decrease Horizontal rod radius in EEPROM settings.

Try it for Y direction too.

Firmware settings Repetier

LCD (Configuration.h)

Bed heat manager

Pazi:Hot end in heater bed imata ločeno nastavitev tipa regulacije temperature.

Extruder default PREHEAT PLA

LCD: change button direction

ui.h:#define UI_ENCODER_A 31 //CD default == 33; WORKS #define UI_ENCODER_B 33 //CD default == 31; WORKS

Change printer name

configuration.h :#define UI_PRINTER_NAME "Kossel XL 750"

LCD: "dec" message

#define EXT0_DECOUPLE_TEST_PERIOD 0 in the latest release to disable decoupling test completely. But maybe better only increase #define DECOUPLING_TEST_MAX_HOLD_VARIANCE 20

Buy Kossel XL or XXL 3D printer KIT

link

XXL