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Shapeoko and DLP

Posted: Wed Mar 25, 2015 5:47 pm
by veng1
As many may have noticed, the 3D world is abuzz with the Carbon3D announcement for high speed resin printing that now appears to have been upstaged by Gizmo 3D.
http://www.3ders.org/articles/20150325- ... nutes.html
and
http://3dprint.com/53286/gizmo-3d-printers-fastest/

Going to their website gives more details on their method and a fairly inexpensive source of resin:
http://www.gizmo3dprinters.com.au/

The Gizmo method uses a DLP projector shining downwards into a large vat of resin with a mechanism to lower the print so the top of printed object is right at the surface where the projector is focused. It illuminates then lowers, then illuminates and lowers until it gets finished. The problem as I see it is the special vat with the lowering mechanism built in.

I'm wondering if a Shapeoko could be used where the vat is just a tank and the DLP is mounted on the Z-axis. The secret sauce would be to pump the resin in at just the right rate to maintain it level with the top of the print. Maybe GRBL with a feedback loop and modified auto leveling that would sense the resin level and keep the DLP at just the right height to maintain focus.

This would allow virtually any size or shape resin tank consistent with the Z-axis travel. The excess resin could be poured back into the reservoir for the next use. It is preferable to heat the resin a little.

Any thoughts?

Re: Shapeoko and DLP

Posted: Wed Mar 25, 2015 5:52 pm
by WillAdams
I've considered a couple of resin printers, but bounced on them 'cause:

- reputedly unpleasant smells
- breaks down w/ not overly long exposure to UV light --- AIUI, may just break down if not fully cured.
- liquid subject to spills --- awkward to shift liquid around when changing colours
- (potentially) limited shelf-life
- limited part strength in comparison to ABS, not as rigid as PLA

Re: Shapeoko and DLP

Posted: Thu Mar 26, 2015 5:42 pm
by veng1
Will, I can't disagree with any of your points, however, it does appear there is a lot of improvements being made in the resins. Even though there are some downsides, it is hard to fault the huge reduction in printing time.

This concept is just one more use for our machines. It seems to be an improvement on what will be on Kickstarter this fall (or later) with what I believe are some simplifications.

Re: Shapeoko and DLP

Posted: Thu Mar 26, 2015 6:12 pm
by CastIrony
I've been following the Peachy Printer since their kickstarter. Not nearly as fast, but the same basic idea.

Re: Shapeoko and DLP

Posted: Thu Mar 26, 2015 6:26 pm
by MeanderBolt
The cost of the resin seems to be more expensive than filament but I don't have any experience with resin or resin purchases to back this up. But (just thinking out loud here) you would be restricted as to where you had a DLP printer as sun light might be able to cure it? Leave it near a window and find that you have a solid block of resin? Heh. Perhaps not, but I am headed towards the extruded side of things. Especially with things like Ninjaflex and the Nylon stuff starting to hit. It seems like more options.

How strong are the resin prints?
I have seen some folks use ABS for holding their spindles on which seemed like a dangerous idea, but I still learning how far you can stress this stuff. I guess it also depends on how it is built.

Re: Shapeoko and DLP

Posted: Thu Mar 26, 2015 6:59 pm
by Dave Durant
MeanderBolt wrote:But (just thinking out loud here) you would be restricted as to where you had a DLP printer as sun light might be able to cure it? Leave it near a window and find that you have a solid block of resin? Heh. Perhaps not..
Definitely not. The yellow/amber/orange cover you see on most of these printers is used to filter out the wavelength(s) that cure the resin..

The big thing (IMO) with resin printers is the resolution. They just totally smoke all FDM/FFF printers when it comes to resolution. If you're going to do anything with casting, a goo printer is the way to go.

Re: Shapeoko and DLP

Posted: Sat Mar 28, 2015 3:40 pm
by cvoinescu
I am one happy future owner of a Peachy printer. But that's been so long ago I don't even remember when they said they would ship them. When (if?) I eventually get it, I'll report on it.