Looking at Pegasus 12

[BLKKROW]

It could also be a faulty Reprap Discount LCD.

[uncle_bob]

Hi

Indeed, the *assumption* is that the parts are the ones that MakerFarm supplies for a Pegasus 12". If we are into some other set of parts then all bets are off ....

Bob

[augerpro]

It's the LCD from Makerfarm. I personally don't think it's the format, or the cables. I think needs to send us a new LCD, unless you guys know of any other reasons?

[uncle_bob]

Hi

If you are not already in touch wth Coin on all this, you should be. He has always been very quick when you ask him a question. He will want to go though a few things before shipping a part. He also *knows* what you ordered and what he shipped you.

Bob

[augerpro]

Gotta say I'm pretty pi$$ed off at the moment with this printer. Had the ACME rod mounts printed commercially and installed them. First off, the alignment sucks, had the steppers binding up near the bottom really bad. After we messed around with spacing the stepper mounts it is better but not reliable long term solution. Loaded the new firmware and went to level the bed, but it appears the manual option is gone, as it appeared to go through an auto operation. But we don't have the damn sensor mounted because WE CAN'T PRINT and didn't expect to have to send even more parts to the commercial printer!!!!!!!!!!

I didn't find the ACME rod guides to have zero backlash, hope gravity is one our side.

New firmware has "Z offset = -1.6" as the first option in Prepare or Control (can't remember which), which I assume is related to what UB was telling me. Is this a correct starting value?

Note to new owners: don't bother with the Upgrade kit. You can buy the ACME rod parts for cheap and you'll be designing your own mounts anyway. Acrylic sides are easy to make. ABL is $10.

[uncle_bob]

Hi

If you go through all the info on the Deluxe package, they are pretty clear about buying the not-deluxe first and getting the deluxe only after the standard printer is up and running. Yes, I found that a bit odd as well. There are a bunch of differences between the standard printer and the deluxe. The whole geometry of the printer changes.

The Z offset in the firmware is the distance between a typical trigger on the BL Touch and the typical hot end mount in the Makerfarm carriage. If you head over to the Prusa MK2, you will find that all of these sensors have a bit of fiddling involved with them. The part I designed up has a similar offset. It is *not* a perfect number. There is to much tolerance in the probes trigger point for that to be true. You go through a print / measure / change offset / new gcode (loop) process to get them set up.

The other thing to keep in mind, if you are going to use a gcode offset, your firmware will need a negative Z minimum limit in it.

Bob

[augerpro]

The Z offset in the firmware is the distance between a typical trigger on the BL Touch and the typical hot end mount in the Makerfarm carriage. If you head over to the Prusa MK2, you will find that all of these sensors have a bit of fiddling involved with them. The part I designed up has a similar offset. It is *not* a perfect number. There is to much tolerance in the probes trigger point for that to be true. You go through a print / measure / change offset / new gcode (loop) process to get them set up.

Do you know of a good walkthrough?

The other thing to keep in mind, if you are going to use a gcode offset, your firmware will need a negative Z minimum limit in it.

Bob

I don't understand what your saying here?

Thanks for the help!

[uncle_bob]

Hi

I have yet to see a rational set of instructions on setting up the probe on a bed leveling system. It is one of the most discussed and least understood parts of these systems. Compounding the problem is the fact that signs (which way is +) can change depending on what the reference is.

====

A gcode file is generated from an stl by a silcer. The slicer program does a whole bunch of things. One of the many things is to center the stl model up on the print surface. You can tell your silcer how far above or below the surface you want the print to start. Many people find that re-compiling firmware each time you do a different print is a bit of a pain. Changing the Z offset (start of the print) in the slicer can be an easier way to do things. You have to do it one way or the other (firmware or slicer). It's an iterative process that has to be done on each printer after it's built.

In the case of a slicer based adjustment, it can be either negative or positive. The sign simply depends on which direction the offset is being applied in. The standard Marlin firmware has a minimum Z of zero. If you apply an offset of -0.1 mm in your slicer and have a firmware minimum of zero, the offset will be ignored. That makes the process very frustrating ....

Bob

[augerpro]

I tried enabling Manual Bed Leveling and disabling ABL in the configuration.h file, but the printer behaved exactly the same: jumped through 9 positions on its own and stopped. The .h file compiled and uploaded ok, but I must have not added/removed the // properly. Can you tell me what it should look like?

Manual Bed Leveling ===========================//================================================== =========================


//#define MANUAL_BED_LEVELING // Add display menu option for bed leveling.
//#define MESH_BED_LEVELING // Enable mesh bed leveling.


#if ENABLED(MANUAL_BED_LEVELING)
#define MBL_Z_STEP 0.025 // Step size while manually probing Z axis.
#endif // MANUAL_BED_LEVELING


#if ENABLED(MESH_BED_LEVELING)
#define MESH_MIN_X 20
#define MESH_MAX_X (X_MAX_POS - MESH_MIN_X)
#define MESH_MIN_Y 20
#define MESH_MAX_Y (Y_MAX_POS - MESH_MIN_Y)
#define MESH_NUM_X_POINTS 3 // Don't use more than 7 points per axis, implementation limited.
#define MESH_NUM_Y_POINTS 3
#define MESH_HOME_SEARCH_Z 4 // Z after Home, bed somewhere below but above 0.0.
#endif // MESH_BED_LEVELING


//================================================== =========================
//============================ Bed Auto Leveling ============================
//================================================== =========================


// @section bedlevel


#define AUTO_BED_LEVELING_FEATURE // Delete the comment to enable (remove // at the start of the line)
#define DEBUG_LEVELING_FEATURE
#define Z_MIN_PROBE_REPEATABILITY_TEST // If not commented out, Z-Probe Repeatability test will be included if Auto Bed Leveling is Enabled.


#if ENABLED(AUTO_BED_LEVELING_FEATURE)


// There are 2 different ways to specify probing locations:
//
// - "grid" mode
// Probe several points in a rectangular grid.
// You specify the rectangle and the density of sample points.
// This mode is preferred because there are more measurements.
//
// - "3-point" mode
// Probe 3 arbitrary points on the bed (that aren't colinear)
// You specify the XY coordinates of all 3 points.


// Enable this to sample the bed in a grid (least squares solution).
// Note: this feature generates 10KB extra code size.
#define AUTO_BED_LEVELING_GRID


#if ENABLED(AUTO_BED_LEVELING_GRID)


#define LEFT_PROBE_BED_POSITION 0
#define RIGHT_PROBE_BED_POSITION 265
#define FRONT_PROBE_BED_POSITION 0
#define BACK_PROBE_BED_POSITION 280


#define MIN_PROBE_EDGE 10 // The Z probe minimum square sides can be no smaller than this.


// Set the number of grid points per dimension.
// You probably don't need more than 3 (squared=9).
#define AUTO_BED_LEVELING_GRID_POINTS 3


#else // !AUTO_BED_LEVELING_GRID


// Arbitrary points to probe.
// A simple cross-product is used to estimate the plane of the bed.
#define ABL_PROBE_PT_1_X 15
#define ABL_PROBE_PT_1_Y 180
#define ABL_PROBE_PT_2_X 15
#define ABL_PROBE_PT_2_Y 20
#define ABL_PROBE_PT_3_X 170
#define ABL_PROBE_PT_3_Y 20


#endif // AUTO_BED_LEVELING_GRID


// Offsets to the Z probe relative to the nozzle tip.
// X and Y offsets must be integers.
#define X_PROBE_OFFSET_FROM_EXTRUDER -33 // Z probe to nozzle X offset: -left +right
#define Y_PROBE_OFFSET_FROM_EXTRUDER -0 // Z probe to nozzle Y offset: -front +behind
#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.6 // Z probe to nozzle Z offset: -below (always!)


#define Z_RAISE_BEFORE_HOMING 4 // (in mm) Raise Z axis before homing (G28) for Z probe clearance.
// Be sure you have this distance over your Z_MAX_POS in case.


#define XY_TRAVEL_SPEED 8000 // X and Y axis travel speed between probes, in mm/min.


#define Z_RAISE_BEFORE_PROBING 5 // How much the Z axis will be raised before traveling to the first probing point.
#define Z_RAISE_BETWEEN_PROBINGS 5 // How much the Z axis will be raised when traveling from between next probing points.
#define Z_RAISE_AFTER_PROBING 5 // How much the Z axis will be raised after the last probing point.


#define Z_PROBE_END_SCRIPT "G1 Z10 F12000\nG1 X15 Y330\nG1 Z0.5\nG1 Z10" // These commands will be executed in the end of G29 routine.
// Useful to retract a deployable Z probe.


//#define Z_PROBE_SLED // Turn on if you have a Z probe mounted on a sled like those designed by Charles Bell.
//#define SLED_DOCKING_OFFSET 5 // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.




//If you have enabled the Bed Auto Leveling and are using the same Z Probe for Z Homing,
//it is highly recommended you let this Z_SAFE_HOMING enabled!!!


#define Z_SAFE_HOMING // This feature is meant to avoid Z homing with Z probe outside the bed area.
// When defined, it will:
// - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
// - If stepper drivers timeout, it will need X and Y homing again before Z homing.
// - Position the Z probe in a defined XY point before Z Homing when homing all axis (G28).
// - Block Z homing only when the Z probe is outside bed area.


#if ENABLED(Z_SAFE_HOMING)


#define Z_SAFE_HOMING_X_POINT (((X_MIN_POS + X_MAX_POS) / 2)-20) // X point for Z homing when homing all axis (G28).
#define Z_SAFE_HOMING_Y_POINT (((Y_MIN_POS + Y_MAX_POS) / 2)-20) // Y point for Z homing when homing all axis (G28).


#endif


// Support for a dedicated Z probe endstop separate from the Z min endstop.
// If you would like to use both a Z probe and a Z min endstop together,
// uncomment #define Z_MIN_PROBE_ENDSTOP and read the instructions below.
// If you still want to use the Z min endstop for homing, disable Z_SAFE_HOMING above.
// Example: To park the head outside the bed area when homing with G28.
//
// WARNING:
// The Z min endstop will need to set properly as it would without a Z probe
// to prevent head crashes and premature stopping during a print.
//
// To use a separate Z probe endstop, you must have a Z_MIN_PROBE_PIN
// defined in the pins_XXXXX.h file for your control board.
// If you are using a servo based Z probe, you will need to enable NUM_SERVOS,
// Z_ENDSTOP_SERVO_NR and SERVO_ENDSTOP_ANGLES in the R/C SERVO support below.
// RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin
// in the Aux 4 section of the RAMPS board. Use 5V for powered sensors,
// otherwise connect to ground and D32 for normally closed configuration
// and 5V and D32 for normally open configurations.
// Normally closed configuration is advised and assumed.
// The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin.
// Z_MIN_PROBE_PIN is setting the pin to use on the Arduino.
// Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
// D32 is currently selected in the RAMPS 1.3/1.4 pin file.
// All other boards will need changes to the respective pins_XXXXX.h file.
//
// WARNING:
// Setting the wrong pin may have unexpected and potentially disastrous outcomes.
// Use with caution and do your homework.
//
//#define Z_MIN_PROBE_ENDSTOP


#endif // AUTO_BED_LEVELING_FEATURE




// @section homing


// The position of the homing switches
//#define MANUAL_HOME_POSITIONS // If defined, MANUAL_*_HOME_POS below will be used
//#define BED_CENTER_AT_0_0 // If defined, the center of the bed is at (X=0, Y=0)


// Manual homing switch locations:
// For deltabots this means top and center of the Cartesian print volume.
#if ENABLED(MANUAL_HOME_POSITIONS)
#define MANUAL_X_HOME_POS 0
#define MANUAL_Y_HOME_POS 0
#define MANUAL_Z_HOME_POS 0
//#define MANUAL_Z_HOME_POS 402 // For delta: Distance between nozzle and print surface after homing.
#endif


// @section movement


/**
* MOVEMENT SETTINGS
*/


#define HOMING_FEEDRATE {50*60, 50*60, 200, 0} // set the homing speeds (mm/min)


// default settings


#define DEFAULT_AXIS_STEPS_PER_UNIT {80.19,80.19,800,90} // default steps per unit for Ultimaker
#define DEFAULT_MAX_FEEDRATE {500, 500, 2, 50} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {3000,3000,5,3000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot.


#define DEFAULT_ACCELERATION 500 // X, Y, Z and E acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 500 // E acceleration in mm/s^2 for retracts
#define DEFAULT_TRAVEL_ACCELERATION 500 // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves


// The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)
#define DEFAULT_XYJERK 20.0 // (mm/sec)
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)

[uncle_bob]

Hi

Have you wired the printer for the BL touch (taken out the Z axis limit switch) or for the normal setup (no BL touch).

If you are digging into customizing your own firmware, go for the latest version and roll your own. It will take a bit of time, but at least you will have all the latest features.

Bob