SD Press - Mark II (Modifications Breakdown) (Page 4 of 7)

From 24.7C to 105C 4mins 38sec (+/- a second. I did unscientifically and use my phone as a timer.)

I don't think it has anything to do with the software. I think in your case it has to do with thermal mass. In my setup I have the Mk2b stuck directly to a sheet of PEI with a sheet of 3M 486P in the middle. And the thermistor is in the hole in the Mk2b touching the PEI.

In your case you have the Mk2b attached to a sheet of aluminum which is then attached to a sheet of PEI.

At the end of the day. As long as it heats faster then stock your good. The other main advantage over the stock heatbed is that the entire surface is the heater and that it's truly in contact with the print surface. I found a couple air pockets in one of the corners of the silicon pad and doing the same temp cycle listed above took up to 20mins. (When i first got it it did it in 17min but over time it started to take longer. I am assuming that the pad started to separate from the aluminum.)

Oh wait, Which direction did you install the Mk2b? Traces up or down? I did traces up.

ill tell you right now, as im heating this thing of for its first test print with the new carriage, bed setup.  that the aluminum plate underneath is HOT HOT HOT to the touch.  and the PEI on top is HOT, but i can touch it for a second or two.  the aluminum i cant.

Sorry about that. I should have clarified that in the main post.

If you decide to flip it send me a PM, I'll send you a sheet of 3M 468P.

not sure if this is a z backlash issue, or perhaps my PTFE lined bushing experiment isnt panning out in the end but...

non scientifically affixing a dial indicator to measure the bed movement.  i can jog it in increments of 0.1/-0.1 , well....when changing direction it takes three clicks of the 0.1 or -0.1 button just to get the bed to start to move again.  i assume this is quite an issue seeing as how the bed is constantly moving up and down while printing to take into account the unevenness of the bed. 

how are those nifty Z carriages coming along MacGyverX?  ;-)

I saw in your renderings that you had something worked out for the ball screw mount for the carriage as well. What's that going to be?

Also, wouldn't mind if you were willing to PM me some dimensions from what you're making so I can cut one out myself ☺

Is there any difference between the black and red mk2b's?

There are no differences between the black and red mk2b. Both are 12/24V. At the time I got mine. For some reason the red PCB was on sale. I'd prefered the black one. But at the time it was a experiment so I went cheap.

What does bed adhesion have to do with replacing the heatbed? The idea of replacing it is to speed up heat up times.
Furthermore I've tried buildtak on my SD2 back in the day. It was not any better than Kapton tape. And it's pricey.
If you want to get better adhesion, Go with PEI.

As for the Z Rebuild, It's at a stand still for now. I was laid off a while ago and a buddy of mine who is a carpenter has been contracting me work cnc/laser cutting work. So My cnc (and the laser) which has been used for cutting quadcopter parts and machining has been making drawer fronts, table tops, custom signs and custom moldings 5~8hrs a day. As much as I want to do the fun stuff first, I have to pay bills to keep the lights on as such. Which in turn keeps the fam and the cnc/3d printers happy.

Anyway- I think I got the design down. Just need to get it from the screen to in my hands.

On a sidenote, My Press has been pretty happy. I think more so with the controller swap out and the E3D (Thanks again elmoret). But once I get a day or two off. I'll get back to all the mods and publishing all the stuff I've done.