SoliForum - 3D Printing Community — Glass bed users... questions

Re: Glass bed users... questions

null@example.com (Stoney) — Wed, 07 Nov 2012 16:12:41 +0000

I tried a ceramic? tile tonight and thought it was ok but took too long to heat up, so off to the hardware store and got a 2mm sheet of framing glass cut into 4 6x6 squares and still have a larger piece left, total cost $4.95
This is a great mod I think, I am yet to get the z dialled in correctly, I think its closer to 0.25mm or so, raft seems to be sticking quite well though and comes off easily.
I have only printed a couple of smallish cross sections so far though.

Re: Glass bed users... questions

null@example.com (Kamatari) — Wed, 07 Nov 2012 09:48:21 +0000

I brought some new screws but also some nuts and works great it feels like a better surface im printing on and intial prints had good quality

Re: Glass bed users... questions

null@example.com (Stoney) — Wed, 07 Nov 2012 09:28:01 +0000

Kamatari wrote:

cmetzel wrote:
I forgot to measure the z screw, can someone tell me the diameter and length so I can get a longer one, mine's basically bottomed out already from the factory. I'm guessing it's M3 by about 20mm?

Although im not using using a glass bed but going to try with ceramic, i need a slightly longer z screw, is an m3 20mm about right?

The spacers that come with motherboards are ideal, they just screw onto the bottom of the original screw and add about 5mm in length.

Re: Glass bed users... questions

null@example.com (cckens) — Tue, 06 Nov 2012 04:12:51 +0000

So Cal, actually and we had an 80-90 degree day today.

Re: Glass bed users... questions

null@example.com (jefferysanders) — Mon, 05 Nov 2012 23:50:47 +0000

cckens wrote:

Got a 12x12 mirror that was used at my wedding as a centerpiece. Think I'm going to sacrifice it to get what I need. Should yield 4 6x6 pieces that should do pretty good.

How is the weather in Southern Texas?

Re: Glass bed users... questions

null@example.com (cckens) — Mon, 05 Nov 2012 18:04:49 +0000

Got a 12x12 mirror that was used at my wedding as a centerpiece. Think I'm going to sacrifice it to get what I need. Should yield 4 6x6 pieces that should do pretty good.

Re: Glass bed users... questions

null@example.com (elmoret) — Mon, 05 Nov 2012 18:01:54 +0000

Diecrusher wrote:

After using the glass plate I would never go back to the stock kapton taped bed. It works fantastic.... prints are nice an flat.

Completely agree. Best $4 I've spent.

Get two glass plates, so you can easily swap on and off!

Re: Glass bed users... questions

null@example.com (Kamatari) — Mon, 05 Nov 2012 17:59:31 +0000

cmetzel wrote:

I forgot to measure the z screw, can someone tell me the diameter and length so I can get a longer one, mine's basically bottomed out already from the factory. I'm guessing it's M3 by about 20mm?

Although im not using using a glass bed but going to try with ceramic, i need a slightly longer z screw, is an m3 20mm about right?

Re: Glass bed users... questions

null@example.com (solijohn) — Thu, 01 Nov 2012 18:55:25 +0000

Stoney wrote:

would a thin silicon sheet between the glass and aluminium/kapton suffice to grip it ?
It would be nice if it could be used with no clips at all.

The Silicon might singe a bit with the heat. I'd hate to smell that.

Re: Glass bed users... questions

null@example.com (Stoney) — Wed, 31 Oct 2012 03:31:19 +0000

would a thin silicon sheet between the glass and aluminium/kapton suffice to grip it ?
It would be nice if it could be used with no clips at all.

Re: Glass bed users... questions

null@example.com (IanJohnson) — Wed, 31 Oct 2012 03:20:02 +0000

I move the back right clip a little to the left so it isn't in the way when it homes Y. Usually X goes first from somewhere in the middle of the bed, so that one isn't a problem. Then it slides straight back to Y. I give it enough space with the clip that it won't hit it moving off diagonally.

I had a print with a few STLs on one plate that were big enough that I had to move the clips around to keep them out of the way, but most of the time its fine.

Re: Glass bed users... questions

null@example.com (Diecrusher) — Wed, 31 Oct 2012 02:48:29 +0000

I am consistently using 200 for my extruder temp and start my print with the bed about 90 and then drop it down to 80 once it prints a few layers. By the time it drops to 80 it is a few more layers up.

I am just lightly misting the glass with the hairspray.... will try sandblasting the glass tomorrow to see if I can eliminate the hairspray completely.

Ian, What do you do about the glass clips with Lawsy's new firmware? I just saw his vid and it shows homing x, y and z (the back right corner) and then it rapids to the front left corner while it waits to get to temp. I like clipping the glass in the corners as that seems to most appropriate place to contribute to flatness but rapids at with Z near the bed sound dangerous to me.

Re: Glass bed users... questions

null@example.com (macmub) — Tue, 30 Oct 2012 21:41:14 +0000

@Diecrusher

Are you using hairspray?
What temps are you running? First layer & entire print

What seems to work best? Light spray of hairspray or fairly liberal?

Re: Glass bed users... questions

null@example.com (IanJohnson) — Tue, 30 Oct 2012 21:22:32 +0000

I always keep the back right clip a couple of inches in from the corner to make sure it doesn't get crashed into, if home happens to hit Y before sliding over to X.

Re: Glass bed users... questions

null@example.com (Diecrusher) — Tue, 30 Oct 2012 18:48:52 +0000

After using the glass plate I would never go back to the stock kapton taped bed. It works fantastic.... prints are nice an flat.

****CAUTION: **** I got lucky and dodged a potential crash - I noticed this a second before I started a print!! Since the clips I used for the glass are above "Z" zero you have to make sure that your "Z" is ABOVE the tops of the clips when you start a print. When you start the SD, it homes X and Y first and then starts moving Z. If your nozzle is not high enough above the bed you will crash and it could be ugly.