frozensoda wrote:

Arcadenut wrote:

How does hairspray increase surface area? 

The hairspray creates texture that the plastic can grip.  The glass is too smooth by itself and makes it hard for the plastic to grip.

surface area on a tiny scale. if you could zoom in you would see millions of tiny bumps from the hairspray and that helps it stick, at least I think that's what they mean.

Indeed - the same reason a Spider can climb a vertical wall (it has millions of 'points of contact' due to the microscopic hairs on its legs, thus has a higher Surface-to-Surface Contact Ratio allowing it to 'defy gravity' due to its massive surface-contact area despite its mass)

I believe a better way to describe it would be the same - it increases the Surface-to-Surface Contact Ratio (which whilst yes denotes an increased surface *area*, the area isn't as important as creating multiple points of contact versus one larger one).

Ok, I can go with that

Arcadenut wrote:

solidoodlesupport wrote:

Theory: The hairspray is more about surface area than actual stickiness.

How does hairspray increase surface area? 

The hairspray creates texture that the plastic can grip.  The glass is too smooth by itself and makes it hard for the plastic to grip.

surface area on a tiny scale. if you could zoom in you would see millions of tiny bumps from the hairspray and that helps it stick, at least I think that's what they mean.

Indeed - the same reason a Spider can climb a vertical wall (it has millions of 'points of contact' due to the microscopic hairs on its legs, thus has a higher Surface-to-Surface Contact Ratio allowing it to 'defy gravity' due to its massive surface-contact area despite its mass)

I believe a better way to describe it would be the same - it increases the Surface-to-Surface Contact Ratio (which whilst yes denotes an increased surface *area*, the area isn't as important as creating multiple points of contact versus one larger one).

solidoodlesupport wrote:

Theory: The hairspray is more about surface area than actual stickiness.

How does hairspray increase surface area? 

The hairspray creates texture that the plastic can grip.  The glass is too smooth by itself and makes it hard for the plastic to grip.

surface area on a tiny scale. if you could zoom in you would see millions of tiny bumps from the hairspray and that helps it stick, at least I think that's what they mean.

Theory: The hairspray is more about surface area than actual stickiness.

How does hairspray increase surface area? 

The hairspray creates texture that the plastic can grip.  The glass is too smooth by itself and makes it hard for the plastic to grip.

Also I've never cleaned the hairspray from mine, and hardly ever reapply anymore.  I'll give it a fresh coat if I am printing something wide and flat and think it will be a challenge.  It seems to me that a plate will get seasoned after a bunch of prints.  Maybe the ABS residue, or whatever the shadow of a previous print is made of, helps the next one stick.

If I'm impatient I'll start a print after it passes 70c.  It's enough for the first layer to stick, and I figure it will be hotter by the time the heat is really needed.

Theory: The hairspray is more about surface area than actual stickiness.

If I'm impatient I'll start a print after it passes 70c.  It's enough for the first layer to stick, and I figure it will be hotter by the time the heat is really needed.

I played with lowering to 80C a little and it was a problem.

Also for the insulating of the heated bed during warm up, try a washcloth with a piece of cardboard on top, or a hardback book. Pot holders also work well.

Smitty