Japica J-Rev (Page 1 of 2)

I don't trust a printer that has a fake Photoshopped printing "demo", no logic board, and no wires running to the motors or extruder!

The expanding bolts are an interesting idea, but if you think about it, with a fast articulating head balanced on top of four legs each with four movable/rotating joints, the whole thing would wobble worse than Snooky walking out of a bar after last call.

And if you look at the x/y mechanism, it seems likethere aren't enough belts there.  Only one on the z-platform crosses from the left to right sides of the mechanism.  For any solid design, I'd expect there to be at least two to synchronize the left and right sides of the y-carriage movement.  And since the x-motor is present on the z-platform, this looks like it would tie the x and y movements together so the x would have to move every time the y did unless the x moved in the opposite direction to compensate just to stay still.  This seems really bad.

I appers their spell check wasn't working either.

With the 'bolts' being plastic, if there were any binding at all on the z-axis, wouldn't it strip them to all get out, rendering it useless?  Or do the plastic portions hide the actual bolts and I'm just not seeing it?  Either way, I don't see how it could operate accurately for any length of time.

I can only hazard a guess as I don't know the technology behind the telescoping bolts.  I would have to say the there is a kind of gradient on the interiors of each set (except the top one as this is permanently attached to the top platform) that when rotated slides the corresponding next step up.  Kind of like a screw drive, but in multi-piece plastic.

They almost look printed and ABS is pretty sturdy.  If finished correctly, it's pretty slick too.  There may be some binding, but with a smooth surface it may be quite a while before it starts.

They said in the video that they developed the bolts in-house, so someone took a bunch of theory and applied it to design and came up with a workable solution.

But the problem is, if you have your x-axis motor on the z platform, how to do get a belt from the motor up onto the z-carriage and not have it affected the the carriage y-motion?  I don't see a mechanism (like a long keyed rod and sliding gear) that would accomplish this.

Furthermore, how would one power the extruder and motors with no wires and no logic board?

Lastly, those plastic telescoping bolts appear to just be plastic sleeves that are threaded on the inside and outside.  Interesting in concept but they would sway like a stack of tin cans if an actual print head tried to move on them.  The range of motion looks way too tall to have a supporting bolt in them, which--even if present--would still need diagonal support or a full frame to support them like all other printers.  None of these are present.

IMHO, this is clearly a non-functional mockup at best.

Although it is a novel concept, I agree with you guys, seems a little off. I will be waiting on Gigabot to launch & hopefully able to squeeze out the dough for it. 24"x24"x24" with 100 mincron layer capability for likely about 2k?

Sweet.

http://www.kickstarter.com/projects/re3 … is-is-huge

For the starter price of 2500.00 (with all the parts), I am sure they have pretty decent z leadscrews... or at least they ought to for that kind of money

http://www.kickstarter.com/projects/jap … ref=search
there is a video of it and it is wobbling like crazy when they raise/lower the Z axis.....
have a look at the 2:18-2:19 mark, it is very clear. For the resolution they talk about, I would really like to see the thing print an straight tower all the way from top to bottom...

http://www.kickstarter.com/projects/jap … n/comments

Campaign canceled, maybe the truth caught up a little too soon?