"Slacking layer" after changing vat

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behold3d
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"Slacking layer" after changing vat

Post#21 » Wed Dec 10, 2014 8:42 am

I believe the theory is that once they get the grid lined up then they look through a magnifying glass or jewelers monicle and make sure the image is crisp. This is because it is so small.

like i said.. I don't do it. I am only speculating.

Can you loosen the tightening screws in the back and adjust your projector closer and refocus? I don't think that is the case though.

Plus your resin looks very light. Did you shake it? Is this indeed red?

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Robert Howle
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"Slacking layer" after changing vat

Post#22 » Wed Dec 10, 2014 10:16 am

You can fine tune the projector position with this knob at the top to the projector. Loosen screws and move the projector.
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Robert Howle
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"Slacking layer" after changing vat

Post#23 » Wed Dec 10, 2014 10:18 am

You can fine tune the projector position with this knob at the top to the projector. Loosen screws and move the projector.
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qnzhou
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"Slacking layer" after changing vat

Post#24 » Wed Dec 10, 2014 1:24 pm

I did not shake the bottle before pour the resin into vat. Should I do that? The models shown here are actually quite small (just a few millimeter tall). This might also cause the material to appear to be lighter in color.

Robert, I have moved my projector to its extreme location with the screw you mentioned. It is not possible to move it further up without drilling new holes.

[Brief update:] The new vat still create slacking layers even after recalibration of the projector. I think the levelness of PDMS coating really is the culprit.

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Robert Howle
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"Slacking layer" after changing vat

Post#25 » Wed Dec 10, 2014 3:20 pm

The pigment will settle over time. You have to mix the resin throughly before attempting to print. if u leave the resin in the vat u have to stir it well until pigment is in suspension. If u mix Red and Cherry they have to be mixed well before blending the two resins.
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mikej
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"Slacking layer" after changing vat

Post#26 » Thu Dec 11, 2014 12:39 am

If you do not shake the bottle, the initial prints will work but have more z bleed (due to low % of pigment from not shaking). Later, the % of pigment will be increased and prints will start to fail because of excessive percentage of pigment. Like the label says, always shake the bottle.
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qnzhou
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Re: "Slacking layer" after changing vat

Post#27 » Sun Dec 14, 2014 5:11 pm

Just a brief update. I have switched to cherry resin, the part no long have the slacking layer problems. It might be the resin or some setting for cherry resin that fixes the problem.

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