Statistics: Posted by tessen — Mon Oct 19, 2015 12:29 pm
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thank for the link, i would like to test the 0.5mm baking silicone sheet, when i test it, i'll tell how it works
i've achieved print the make rook test but i have to play with the exposure time, this first attempt are really bad
and you are right, with a big area it´s difficultbest regards
Statistics: Posted by tessen — Sat Oct 10, 2015 10:17 am
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2 - in the config, i have put the contrast to max
3 - i have separated the color wheel (without broken)
photos:
i have made a piece to support the wheel out
i can't leave the color wheel hole open, i have to cover it
4- i have remove the buffer stop on the zoom wheel to focus closer
photos:
without the buffer stop move the cilinder to the output lens and in the hole i have make and put this piece to avoid the zoom cilinder come back
and fix it with aluminum tape
5- remove the lamp UV filter, but i must to put another because i don´t want that the hot from the lamp come into this part
warning these are the changes that I made to my projector, does not mean it will work better (have to try it) I am not responsible if someone decides to follow in my footsteps
regards
Statistics: Posted by tessen — Thu Oct 08, 2015 2:27 pm
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To use a stepper as a shutter i config this motor as X motor on arduino (in my setup i do one revolution with 4mm if i want to move 90º i have to move 1mm) and to add this to the CW --> configure--> configure slicing profile-->Gcode
y put on the lift sequence this:
;********** Lift Sequence ********
G04 P100 ;
G1 X0.8 F300
G1 Z($ZLiftDist * $ZDir) F{$CURSLICE < $NumFirstLayers?$ZBottomLiftRate:$ZLiftRate}
G1 Z(($LayerThickness-$ZLiftDist) * $ZDir) F$ZRetractRate
;<Delay> %d$BlankTime
G1 X-0.8 F300
G04 P300
;********** Lift Sequence **********
in the start i add this:
;********** 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
G28 X (homming the X axis looking the endstop)
G1 X0.7 F200
;********** Header End **********
regards
Statistics: Posted by tessen — Thu Oct 08, 2015 8:21 am
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About the machine, yes you are right,the resin not stick to the BP
i tried to increment the exposure for bottoms layer (2-5-10-15-20sg) but with the same outcome, i cleaned the BP with IPA like you mention and apply a resin layer to the BP thereafter i have polymerized this layer with the sun and put back in the machine and more than the same, the resin prefer to stick in the film, about the film i´m using, is a teflon derivative not the typical FEP is ETFE similar properties but better mechanical properties, i tend to think this could be the problem andi don´t know if include a tilt VAT could solve the problem, i prefer not using this mechanism to not complicate the machine (if i can)
Yes, i´m using endstop on Z axis but i tried to disconnect it and put the BP lean to the VAT film and the same result
anyway,thanks for your tips
Statistics: Posted by tessen — Wed Oct 07, 2015 1:53 pm
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If I understand you correctly .... the layer does not stick to your build platform?
If so, try extending the time of exposure for the first layers.
Clean the build platform with IPA (DO not clean the VAT with IPA - not good).
Other then that, make sure that your build platform is all the way resting in your VAT.
Seems like you are using endstops ....
I am always leaning the build platform into the VAT to avoid air getting trapped between the platform and FEP film.
Then i screw the platform back on the Axis.
Hope that helps.
Statistics: Posted by Kvirre — Wed Oct 07, 2015 10:50 am
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Details and bill of Materials:
- botton-up
- full hd Optoma HD141X (modified)
- arduino mega+ ramps 1.4 (marlin firmware)
- nema 23 motor for Z axis
- nema 17 motor for shutter
- C1 class ballscrew 16mm and thk HRW 21 rail for Z axis transmision
- VAT in aluminum with botton of ETFE film
- steel structure
- creation workshop (as could not be any other way, thanks a lot pacmafan!)
photos:
3d render:
the vat:
"popurri"
the assembly:
and for the last a working test:
https://www.youtube.com/watch?v=ASoDnotmbaY
About he projector mod: (i have tons of photos)
- high altitude mode
- removing the color wheel (without breaking away)
- removing the UV filter of the lamp (but instaled another without UV filter)
- remove the zoom stop
I'm using the castable FunToDo resin, but.. I have not yet managed to print anything, because the part not grips well to the support
any comment/help will be welcomedbest regards
Statistics: Posted by tessen — Wed Oct 07, 2015 8:27 am
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