Partial print at 76.2 micron slice

A lost wax capable resin tuned for 70 - 200 micron slice thickness
dabbler
B9 Maker
B9 Maker
Posts: 33

Partial print at 76.2 micron slice

Post#1 » Fri Feb 27, 2015 2:16 am

I originally posted this is hardware troubleshooting but maybe it's better here?

This is my first attempt at a print.

V1.0 machine with Red resin, 76.2 slice, 75 x-y:

eiffel tower.jpg


All settings at default:

Software Version: Version 1.7.3 Copyright 2014 B9Creations, LLC www.b9creator.com

Last Comm Port: COM64
Display Index: 1
Last Print Attempt Status: Aborted
Configuration: B9Creator v1.1.0, XY at 75 microns
Job Name: F:/reprap stuff/3d models/Eiffel_Tower/eiffel tower large.b9j
Job Data
Name: eiffel tower large
XY Pixel Size: 75 µm
Slice Thickness: 76.2 µm
Total Layers: 1588
Material Volume: 9.33 ml

Material Settings
ID: B9R-1-Red, Description: General purpose, lost wax suitable.
Calc Base: 8.541, Used Base: 8.541
Calc Over: 0.427, Used Over: 0.427
Calc Attach Layers: 2, Used Attach Layers: 2
Calc ABase: 19.644, Used ABase: 19.644
Calc AOver: 0.982, Used AOver: 0.982

Cycle Settings
Unsupported Pixel Multiplier: 0.8
Shutter Open Speed : 70
Shutter Close Speed : 60
Pre Exposure Delay (Settle) : 2.5
Post Exposure Delay (Kick) : 0.2
Post Release Delay (Breathe) : 1.5
Overlift Cutoff (mm) : 0.5
Initial Overlift (mm) : 3
Subsequent Overlift (mm) : 1
Dip (mm) : 0

Job Position
X Offset: 0
Y Offset: 0
Mirrored: false
Show Grid: true


Any ideas what's going on here?

jimbit22
B9 Maker
B9 Maker
Posts: 27

Re: Partial print at 76.2 micron slice

Post#2 » Fri Feb 27, 2015 3:15 am

Not sure, but you must have a hotspot. If everything ealse is ok..

User avatar
Robert Howle
B9 Creator
B9 Creator
Posts: 6629

Re: Partial print at 76.2 micron slice

Post#3 » Fri Feb 27, 2015 4:31 am

I would check focus, nothing is crisp there. Make sure u used the downloaded grid for correct machine and printed at"actual size".

Robert
Dance like nobody's watching!

dabbler
B9 Maker
B9 Maker
Posts: 33

Re: Partial print at 76.2 micron slice

Post#4 » Fri Feb 27, 2015 5:43 am

Hi Robert,

I have the grids and set the focus on the 75 micron grid.

As a test, I just tried something a little less ambitious and it's clear that the print is elongated so it's moving too far in z.

There's also a little bit of a problem with the initial few layers on one corner.

This is a 20mm cube:





And the settings:
Software Version: Version 1.7.3 Copyright 2014 B9Creations, LLC www.b9creator.com

Last Comm Port: COM64
Display Index: 1
Last Print Attempt Status: Completed
Configuration: B9Creator v1.1.0, XY at 75 microns
Job Name: F:/reprap stuff/3d models/small cube.b9j
Job Data
Name: small cube
XY Pixel Size: 75 µm
Slice Thickness: 76.2 µm
Total Layers: 263
Material Volume: 1.23 ml

Material Settings
ID: B9R-1-Red, Description: General purpose, lost wax suitable.
Calc Base: 8.555, Used Base: 8.555
Calc Over: 0.428, Used Over: 0.428
Calc Attach Layers: 2, Used Attach Layers: 2
Calc ABase: 19.676, Used ABase: 19.676
Calc AOver: 0.984, Used AOver: 0.984

Cycle Settings
Unsupported Pixel Multiplier: 0.8
Shutter Open Speed : 70
Shutter Close Speed : 60
Pre Exposure Delay (Settle) : 2.5
Post Exposure Delay (Kick) : 0.2
Post Release Delay (Breathe) : 1.5
Overlift Cutoff (mm) : 0.5
Initial Overlift (mm) : 3
Subsequent Overlift (mm) : 1
Dip (mm) : 0

Job Position
X Offset: 0
Y Offset: 0
Mirrored: false
Show Grid: true
Attachments
cube1.jpg
cube2.jpg
cube3.jpg

dabbler
B9 Maker
B9 Maker
Posts: 33

Re: Partial print at 76.2 micron slice

Post#5 » Fri Feb 27, 2015 8:01 am

I have found that actually the Z axis is spot on, it's the X and Y that have been squashed...

The cube is 14.75mm square instead of 20mm.

Just to clarify, the 75 micron grid should match the projected grid with the paper grid sat in the window of the vat?

My projector is about 65mm away from the bottom of the unit.

Thinking about it, that's near on 25% smaller so it's as if the projector is focused at 50micron size?

dabbler
B9 Maker
B9 Maker
Posts: 33

Re: Partial print at 76.2 micron slice

Post#6 » Fri Feb 27, 2015 3:25 pm

Turned out not to be elongation of Z but incorrect calibration of projector due to using the original (first issue?) calibration printout from the wiki.

Now I have a square cube, just need to find out why it's partial printing...

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