Sintron Delta Build - Buyer Beware! (Page 2 of 3)

I actually have the pdf file for the assembly instructions, but it requires a password and I cant remember what that is at the moment...

most of their instructions were plagiarized from Blomker Industries - perhaps finding a copy of those instructions may help?

otherwise, will try to find the password later tonight.

the Sintron kit IS a nightmare of a kit and they were a nightmare to deal with, and I cant stress that enough.

if you want a decent kit for the money (and larger, too) go for the FolgerTech kossel. it is larger, and in general a better kit.

a comparison pic - Folgertech on the left (completed & operational) and Sintron on the right (frame only with reprinted plastics)

I finally got my printer running! After about 3 weeks and at least 20 hours of work, I got my sintron kit to run the way it's supposed to:
https://youtu.be/6dWQOSgm3WY
https://youtu.be/2oRdNNEMTHk

Unfortunately, it is nearly impossible to get it running with just stock parts. Here is what you need:
- washer/spacers for the wheels so the sliders don't rub
- a newer version of marlin. Use the config from the sintron firmware to fill out a new one. I used https://github.com/RichCattell/Marlin  Which is built specifically for deltas
- Either a working auto level probe, or different bed mounts that allow you to adjust it manually. The stock version of marlin always crashed into the bed or would not work in some other way.
-turn down "duty cycle" for the bed in the firmware, otherwise the polyfuse overheats. Even with the 30amp power supply I am using.
- the switch to change from 220 to 110v is inside the power supply. It took me a while to figure out why the voltage was at 9v, but then I found the switch.
- READ AT LEAST MOST of the reprap.org forum topic on the sintron kossel. It is extremely useful.

I also made these mods:
- (fake) e3d Volcano for $8
- e3d v6 clone heatsink and throat (so I can print polycarbonate), still in the mail
- fan mount that also blows on print. Greatly increases the quality of PLA parts. Mine doesn't fit (see pictures) because the spacing isn't right on the heatsink/throat
- replaced the z probe Allen key with an inductive sensor from aliexpress for $2
- geared extruder. The stock direct drive would kink ABS filament and stop constantly while I was using the stock e3d v5, and it didn't run the volcano at all. Http://www.thingiverse.com/thing:1185662
- Ramps & LCD case (yet to be printed at the time of the writing of this article)
- In the video above, I am printing a new spool holder.

I am using Repetierhost Host with Slic3r. I can share config files if needed. Feel free to ask any questions!

Does anybody know why I can't get the pullups to function on the Sintron Delta Printer?  The endstops are showing "open" when I do the M119 in Pronterface but when I hold them shut or position the carriages to close them M119 still shows them as "open" when they should be TRIGGERED.  The Carriages want to crash through the top frame so I know the direction is good but endstops just don't do their thing. I have used as many different variations of the Marlin firmware as I can find but nothing works so I am wondering if it's a hardware issue?  I am using the bog standard Sintron Arduino board with RAMPS 1.4, I get 5 volts on the pins, and I get Ohms on the endstop wires, also the red LEDs operate when the switches are pressed to trigger.
Any good advise out there?
Thanks all
Tooluser

Is this max or Min? Do Delta printers have Min endstops?

Mine uses max (see picture)

Thanks for the help so far with the endstops and pullups, still can't get anything to work. In Pronterface I run M119 and shows endstops are open except ZMIN as triggered although its not connected. If I hold one endstop closed and run M119 again it still shows xyz endstops as open when one should be triggered. If I do 'home all axis' they don't stop at the endstops and have to hit the big switch to stop. I have voltage to pins, red LEDs come on when closed but they don't operate the pullups I am thinking?
Below is the bog standard config.h from Sintron who assure their firmware has no problems and is ready to go! can anyone see any obvious errors with this?  Thanks to all.

//=============================Mechanical Settings===========================
//===========================================================================

// Uncomment the following line to enable CoreXY kinematics
// #define COREXY

// coarse Endstop Settings
#define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors

#ifndef ENDSTOPPULLUPS
  // fine endstop settings: Individual pullups. will be ignored if ENDSTOPPULLUPS is defined
  // #define ENDSTOPPULLUP_XMAX
  // #define ENDSTOPPULLUP_YMAX
  // #define ENDSTOPPULLUP_ZMAX
  // #define ENDSTOPPULLUP_XMIN
  // #define ENDSTOPPULLUP_YMIN
  // #define ENDSTOPPULLUP_ZMIN
#endif

#ifdef ENDSTOPPULLUPS
  #define ENDSTOPPULLUP_XMAX
  #define ENDSTOPPULLUP_YMAX
  #define ENDSTOPPULLUP_ZMAX
  #define ENDSTOPPULLUP_XMIN
  #define ENDSTOPPULLUP_YMIN
  #define ENDSTOPPULLUP_ZMIN
#endif

// The pullups are needed if you directly connect a mechanical endswitch between the signal and ground pins.
const bool X_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool X_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Y_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
//#define DISABLE_MAX_ENDSTOPS
//#define DISABLE_MIN_ENDSTOPS

// Disable max endstops for compatibility with endstop checking routine
#if defined(COREXY) && !defined(DISABLE_MAX_ENDSTOPS)
  #define DISABLE_MAX_ENDSTOPS
#endif

// For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
#define X_ENABLE_ON 0
#define Y_ENABLE_ON 0
#define Z_ENABLE_ON 0
#define E_ENABLE_ON 0 // For all extruders

// Disables axis when it's not being used.
#define DISABLE_X false
#define DISABLE_Y false
#define DISABLE_Z false
#define DISABLE_E false // For all extruders

#define INVERT_X_DIR false    // for Mendel set to false, for Orca set to true
#define INVERT_Y_DIR false    // for Mendel set to true, for Orca set to false
#define INVERT_Z_DIR false    // for Mendel set to false, for Orca set to true
#define INVERT_E0_DIR false   // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E1_DIR false   // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E2_DIR false   // for direct drive extruder v9 set to true, for geared extruder set to false

// ENDSTOP SETTINGS:
// Sets direction of endstops when homing; 1=MAX, -1=MIN
#define X_HOME_DIR 1
#define Y_HOME_DIR 1
#define Z_HOME_DIR 1

#define min_software_endstops true // If true, axis won't move to coordinates less than HOME_POS.
#define max_software_endstops true  // If true, axis won't move to coordinates greater than the defined lengths below.

// Travel limits after homing
#define X_MAX_POS DELTA_PRINTABLE_RADIUS
#define X_MIN_POS -DELTA_PRINTABLE_RADIUS
#define Y_MAX_POS DELTA_PRINTABLE_RADIUS
#define Y_MIN_POS -DELTA_PRINTABLE_RADIUS
#define Z_MAX_POS MANUAL_Z_HOME_POS
#define Z_MIN_POS 0

#define X_MAX_LENGTH (X_MAX_POS - X_MIN_POS)
#define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)
#define Z_MAX_LENGTH (Z_MAX_POS - Z_MIN_POS)

I upgraded to an inductive sensor which acts exactly like the z probe (as long as you buy the version with the orange cap), but it doesn't touch the bed. I highly recommend it as a $2 fix to the crappy probe provided.
Here is what I could get (I don't have access to the printer at this moment):

So where do the Z probe wires connect?

I have the FT Mini Kossel which uses a RAMPS and The same endstops.. Mine where connected to MAX ports, not the min ports as you currently have it.

In a delta it is backwards in logic from a regular box or Cartesian printer. It homes at MAX and then moves down to ZERO to start a print.. That is why the Z probe is connected to Z min as you would want it to trigger at the bottom on the print bed.

Your slicer is configured for a square printer maybe?

something is not set right - either in the host and/or the firmware.

I dont use pronterface, so have no idea how that is set up.

for the firmware, maybe try downloading FolgerTech's Rev B kossel firmware, enter your dimensions and try it - bearing in mind that the FT kossel is a fair bit larger than the Sintron.