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For the mirror, I was curious about using the HDD platter as well. If you do, let us know how it works. I'm using a first surface mirror on my bottom up that I got for a couple of dollars from my local American Science & Surplus
Statistics: Posted by miribota — Thu Jul 09, 2015 12:04 am
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But, with MakerJuice at $55 a litre, it's not as expensive as it used to be.
If you were asking about the projector? I got mine for <$50 including shipping on eBay. Guess I'll have to see how bad the dead pixels affect my prints.
On another note, I saw someone comment about using hard drive platters for front-surface mirrors. I might look into that rather than mounting my projector pointing down.
Statistics: Posted by JohnGay — Wed Jul 08, 2015 7:41 am
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By the way is there any particular reason you avoided the same projector used in the article (selling around $75 with free shipping)?
EDIT: projector not printer
Statistics: Posted by piemaker16 — Tue Jul 07, 2015 8:08 pm
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Statistics: Posted by JohnGay — Tue Jul 07, 2015 8:17 am
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My stepper motor is a Neocene 2T354205 12V 5 Ohm 96 step per revolution.
It's connected through 2 gears to a belt drive in my scanner.
After enabling 1/16 step on the driver, and then setting Z=750 step/mm I measure Z300 == ~297mm
I also see the scanner has an optical sensor at the start of travel. Not sure if I want to try to connect that through grbl, since my top-down setup will be dependent on the fill level. Probably need to set the start point manually. Unless I set Z0 == bottom of VAT? Strangely, Creation Workshop won't take machine configuration on my laptop. However, I have a workstation I plan to use that seems to run CW properly?
I'll do some exposure testing later.
Statistics: Posted by JohnGay — Mon Jul 06, 2015 9:19 pm
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Regarding exposure times, I didn't test with the 2104, but the Dell I tried wouldn't cure with just the UV glass removed until I removed the color wheel.
Statistics: Posted by miribota — Mon Jul 06, 2015 2:17 pm
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Statistics: Posted by JohnGay — Mon Jul 06, 2015 1:16 pm
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I was checking out me set-up and my projector seems to be switching off? Maybe because of the missing UV filter Glass. I wonder if I can remove the filter from the glass and put the glass back in?
Statistics: Posted by JohnGay — Sun Jul 05, 2015 7:34 pm
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Then one day I turn the projector on and I get a LOT of stuck pixels. I'm not sure it was just the projector, me stripping it down the the DLP chip which could have effected cooling or removing the UV glass and color wheel. I'm doing this on a thin budget, so I've ordered another 2104 and will have it tomorrow. I'll do the same, remove the UV glass, color wheel and add the spacers. I may leave off the cover and add a fan to help cooling.
As a note, after the 2104 failed I got a Dell 1409x. I did the same process and after running for about 5 minutes smoke started coming from the projector. It started to melt and burn the plastic in the assembly behind the lens assembly. In the trash with that one. Giving the 2104 one last shot, otherwise I'll need to save for a proven projector.
Statistics: Posted by miribota — Wed Jul 01, 2015 11:30 pm
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Statistics: Posted by JohnGay — Wed Jul 01, 2015 9:15 am
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In other news, I just ordered some blue makerjuice G+ Because I LIKE blue (-=
So I can start testing exposure times with my projector. I'm hoping I can get by without mod'ing the optics. I'm willing to take longer to print if I can get larger prints, but I'll see what develops.
Statistics: Posted by JohnGay — Tue Jun 30, 2015 7:32 am
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The stepper is 12V 5 Ohm with 3.75 step angle with two reduction gears for the belt drive. There is one round shaft that attached to the molded plastic case of the scanner. The scanner claims a resolution of 4800 over the nearly 300mm length of the scan area. I calculate that to be about 0.06mm per step but that's using the scanner. Haven't tried driving it directly yet.
Statistics: Posted by JohnGay — Mon Jun 29, 2015 10:07 am
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I can get the projector to focus sharply down to approximately 6-7 inches wide without modifying anything else. Guess I need to get some Makerjuice now and start testing exposure times and resolutions?
Statistics: Posted by JohnGay — Tue Jun 23, 2015 8:07 am
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