exxos blog - random goings on

[exxos]

I was contemplating getting a 3d printer until I read this thread Seriously, is it really this finicky or have you dropped unlucky?

Depends how you look at it all. I am wanting things to be precise and reliable. But so far all the technology out there I have seen, its being basically junk. It really is a wonder how anyone gets this stuff working. I have actually had three printers so far.

The flash forge was great as a starter printer and worked " really well". The problems with that started as it was all closed source and he could not even calibrate the motor steps. Its why I started changing the board in the first place.

The BTT BX printer I think will work really well once I get the linear rails fitted.

Overall it is just incredibly time-consuming to wade through millions of things which go wrong. Like the Z-end stop switch, it actually bends and can cause the printhead to crash into the bed. Is why I change it for a Opto sensor as it is more precise. But this would mean every printer which uses switches would just inherently be bad. So I just assume people are not noticing these problems like I do. Otherwise the Internet would be full of complaints and every manufacturer would have gone bust by now.

[exxos]

Bizarrely the layout of the board seems to be.

X,Y,Z0,X1,E1,E0.
Now I have the motor in E0, but when I try and exclude mode to just "thumps" once and that's it

Motor works as I currently have a spare motor plugged in and that motor works in the X-axis port. So it's not the motor. So now what's up with the stupid thing ?!

[exxos]

So the stepper motor in my video which is clearly working, no longer works and ive had to swap the cables around to get it working again its a nema17 the same as the extruder motor, which was also working earlier.

The only change I did really in the firmware was to set the proper driver chip numbers. AFAIK you cannot change the pinouts on the actual driver chips ?! Will look into that, but that would then mean the XYZ motors shouldn't be working now.. Unless I never tested them before I gave up last time either way, the pinout has swapped and I don't get why or how that's even possible. I've not mixed up cables and I've only got 1 spare cable !

[TheNameOfTheGame]

A lot of these printers are fully or partially via suppliers (Chinese) which use the "Minimum viable product" concept. Not only offering the bare minimum features needed to attract buyers, but also the minimum quality of components and engineering design. Just the world we live in now sadly. Especially with emerging technology which the ordinary person needs price to be a factor when adopting.

Yes, I have 3D printer as such and yes, it is basically crap.

[exxos]

A lot of these printers are fully or partially via suppliers (Chinese) which use the "Minimum viable product" concept. Not only offering the bare minimum features needed to attract buyers, but also the minimum quality of components and engineering design. Just the world we live in now sadly. Especially with emerging technology which the ordinary person needs price to be a factor when adopting.

Yep exactly. Even the "pro printers" costing x10 as much don't look any different. I assume support would be better and that's what your paying for. But probably scripted support which is doomed to fail by design anyway.

Same old saying, if you want something doing, do it yourself

[exxos]

It's aliveeeeeeee

IMG_0293.JPG (243.97 KiB) Viewed 3431 times

[exxos]

Spot the oopsies

Code: Select all

#pragma once
constexpr temp_entry_t temptable_908[] PROGMEM = {
 { OV(88),270},
 { OV(92),265},
 { OV(98),260},
 { OV(104),255},
 { OV(114),250},
 { OV(120),245},
 { OV(134),239},
 { OV(165),230},
 { OV(175),225},
 { OV(197),220},
 { OV(214),210},
 { OV(211),200},
 { OV(309),190},
 { OV(316),188},
 { OV(420),174},
 { OV(520),162},

[exxos]

Okay so someone please explain this to me

I home all and all that works fine. I send G1 X- Y0 F500 And it correctly moves to the centre of the build plate.

I then use simplify 3-D ( which works fine with the other printer) And the head moves as far to the left and to the front of the machine and basically keeps on going. It is like things the build volume is twice the size as it actually is.. But I have the correct dimensions in the Marlin firmware.

Looking at the first lines in the Gcode file it is sending..

Code: Select all

T0
G92 E0.0000
G1 E-0.5000 F600
; feature skirt
; tool H0.200 W0.500
G1 Z0.200 F500
G1 X18.601 Y11.358 F5000
G1 E0.0000 F600
G92 E0.0000
G1 X18.495 Y13.423 E0.0869 F1080
G1 X18.136 Y16.913 E0.2345
G1 X17.297 Y20.954 E0.4080
G1 X16.028 Y24.952 E0.5845

So little bit off centre because the object is only small. So the codes being sent seem correct. So why the hell is it trying to print physically outside of the print bed ?!

[exxos]

Some funky Gcode hackery seems to help.

Code: Select all

M92 X178 Z800 Y178.10;  // FF calibration
G28 X ; home XY
G28 Y ; home XY
G28 Z; home Z 
G92 X0 Y0 Z0; //set home
M204 P1000 ; acceleration 800 okish ? blobs in corners 200 seems best :(
G0 X-115 Y-70 Z10 F2000 ; center head
G28 Z; home Z 
G0 Z-0.20; //move head closer to bed
G92 X0 Y0 Z0; //set home

[Badwolf]

Okay so someone please explain this to me

I home all and all that works fine. I send G1 X- Y0 F500 And it correctly moves to the centre of the build plate.

(0,0) is front left edge of the build plate on my printer.

Is your slicer working to a different origin to your printer?

BW