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Build Your Own SLA/SLS • Issue with the z-axis
Page 1 of 1

Issue with the z-axis

Posted: Wed Jul 08, 2015 11:57 am
by mxmlan
Hey guys,

I recently finished my printer but I still have some issues with the z-axis. All my prints are out of shape on the z-axis. I'm using a Dell M115 HD, Ramps 1.4, Pololu stepper driver, Nema 23 stepper motor (http://en.nanotec.com/fileadmin/files/D ... 1008-A.pdf), 16mm Rod (4mm pitch per rotation) and 1/16 micro stepping with configured 800 steps per unit with the modified mUVe firmware. Does anyone have a clue for me?

Layer height: 0.1mm
First layer time: 20 sec.
Layer time: 15 sec. (the projector has just 450 Lumen)

There is no wobbling on z. There seem to be no problem if I move z manually. :cry:

What do you think?

Thank you so much!

IMG_3960.JPG

IMG_3961.JPG


And please just ignore the cracks on the base plate.

Re: Issue with the z-axis

Posted: Wed Jul 08, 2015 12:07 pm
by mxmlan
This is how the GCode looks like:

;(****Build and Slicing Parameters****)
;(Pix per mm X = 18.28571 px/mm )
;(Pix per mm Y = 18.28571 px/mm )
;(X Resolution = 1280 )
;(Y Resolution = 800 )
;(Layer Thickness = 0.10000 mm )
;(Layer Time = 15000 ms )
;(Render Outlines = False
;(Outline Width Inset = 2
;(Outline Width Outset = 0
;(Bottom Layers Time = 25000 ms )
;(Number of Bottom Layers = 3 )
;(Blanking Layer Time = 10600 ms )
;(Build Direction = Bottom_Up)
;(Lift Distance = 5 mm )
;(Slide/Tilt Value = 0)
;(Anti Aliasing = False)
;(Use Mainlift GCode Tab = False)
;(Anti Aliasing Value = 1.5 )
;(Z Lift Feed Rate = 50.00000 mm/s )
;(Z Bottom Lift Feed Rate = 25.00000 mm/s )
;(Z Lift Retract Rate = 100.00000 mm/s )
;(Flip X = True)
;(Flip Y = True)
;Number of Slices = 392
;(****Machine Configuration ******)
;(Platform X Size = 70mm )
;(Platform Y Size = 43.75mm )
;(Platform Z Size = 200mm )
;(Max X Feedrate = 100mm/s )
;(Max Y Feedrate = 100mm/s )
;(Max Z Feedrate = 100mm/s )
;(Machine Type = UV_DLP)
;********** Header Start ********
;Here you can set any G or M-Code which should be executed BEFORE the build process
G21 ;Set units to be mm
G91 ;Relative Positioning
M17 ;Enable motors
;********** Header End **********
;********** Pre-Slice Start ********
;Set up any GCode here to be executed before a lift
;********** Pre-Slice End **********
;<Slice> 0
;<Delay> 25000
;<Slice> Blank
;********** Lift Sequence ********
G1 Z5.0 F25.0
G1 Z-4.9 F100.0
;<Delay> 10600
;********** Lift Sequence **********
;********** Pre-Slice Start ********
;Set up any GCode here to be executed before a lift
;********** Pre-Slice End **********
;<Slice> 1
;<Delay> 25000
;<Slice> Blank
;********** Lift Sequence ********
G1 Z5.0 F25.0
G1 Z-4.9 F100.0
;<Delay> 10600
;********** Lift Sequence **********
;********** Pre-Slice Start ********
;Set up any GCode here to be executed before a lift
;********** Pre-Slice End **********

Re: Issue with the z-axis

Posted: Wed Jul 08, 2015 3:06 pm
by mxmlan
Okay, after printing 60 Layers of .1 mm (dry run) I can actually measure a height of 6 mm. I don't get it. Everything seems to be correct. Could it be a projector issue?

Re: Issue with the z-axis

Posted: Wed Jul 08, 2015 4:26 pm
by JohnGay
At a first guess: If that ball is supposed to be round, but the Z axis measures correctly, maybe you have the X-Y axis wrong?
They are supposed to be the measured dimensions of the projected image, not the resolution of the projector.
Otherwise, maybe the ball is getting squashed somewhere in you software path?

Re: Issue with the z-axis

Posted: Wed Jul 08, 2015 6:21 pm
by PacManFan
Check the projected dimensions of the X/Y axis. Measure them with a ruler and make sure that the correct resolution is selected.

Re: Issue with the z-axis

Posted: Wed Jul 08, 2015 7:32 pm
by mxmlan
Wow, I actually forgot to check that. Thank's PacManFan & JohnGay! :)

Re: Issue with the z-axis

Posted: Sat Jul 11, 2015 5:13 pm
by mxmlan
Thank you again! :D

IMG_3975.JPG

Re: Issue with the z-axis

Posted: Sun Aug 09, 2015 4:32 am
by 1125lbs
Hi mxmlan,

could you tell us about the m115 hd modification, i trying to bypass the blue led, did you change the blue leds for any uv luminus device? i got an custom uv led to exchange with original, now i having some troubles with electronics, couse when you take of the projectos protection, and rgb sensors seems to detect the missing stuff, would you share us your experience in m115hd modification? thanks