SecSavr Sublime [gd0036]

From asking around, and research, it sounds like Klipper might run into issues with the dual MCU setup I'd need. This is becuase boards like the RPi (and I assume the Orange Pi) are not realtime.  The main concern is the dual ZM (main z gantry) axis, which ideally should move at the same time.

This is what I'm currently planning:

1. Octopus Pro
   1. X1
   2. Y1
   3. ZM
   4. ZM
   5. W1
   6. V1
   7. E1
   8. S1
2. Octopus Pro
   1. X2
   2. Y2
   3. Z1
   4. Z2
   5. W2
   6. V2
   7. E2
   8. S2

Where

• X[number] = X for IDEXY head [number]
• W = Either the rotational bed axis motor or the belt bed motor
• V = Rotational axis motor in the Slime [gd0088]
• S = Extruder motor in #SecSavr Select [gd0091] 
  • (also, I just found out about Hackaday.io's hashtag feature while typing this log)

I've got the firmware flashed and the PSUs wired up, ready for testing tomorrow.

I can't seem to get the extruder motor to move on the AIO II. It uses some ST820 drivers and the AIO wiki doesn't tell me what resistors or logic voltage it uses for me to use the equation on the ST820 drivers.

Thus I'm going to get the Octopus Pro set up. This will also be a good chance to try the S6609s at 36V.

So a few days ago, I set up something to get some data on the melt zone extenders. The thermistor taped to the nozzle is the same as the one in the CHC pro. The AIO II is used here to get readings along with a fanless 24V 200W PSU. There is also a fan offscreen gently blowing air over the hotend.

The nozzle thermistor doesn't have desirable contact with the nozzle to get an accurate reading.

The CHC took 70s to go from 26C to 236C, and the nozzle took another 40 seconds to equalise at 153C.

Then I tried without the melt extenders:

There was a much larger temperature lag and eventual difference, only reaching 103C.

Next was a regular volcano nozzle:

Temp detected at nozzle: 170C

This is why I believe that the thermistor doesn't have a good amount of thermal coupling with the nozzle. Some kind of TIM would likely be needed to get an accurate temperature reading.

Lastly, I tested out the supervolcano with 3 9mm extenders (Ideally, I'd just use 1 30mm extender but I'd need to get a suitable M6 tap)

Temp detected at nozzle: 123C

TriangleLab's copper melt zone extenders may work better for this application. Regardless, next I will be testing out the flow rates in a future Project Log.

Ahh yeus the Octopus Pro has finally arrived. Coming with 8 stepper drivers that can all be used to 48V and costing £36 + VAT (on the cheaper end of boards with 8 drivers), it's the best option for what I need to do. I'm no professional but I do need another 3 for my dual core SecSavr setup.

Currently trying these drivers on the DP2: 

https://hackaday.io/project/184230-dp2-repair-gd0014/log/204221-trying-the-gc6609-stepper-drivers

Me In The Past put in a great deal of effort and considerations to get the SecSavr Space to 224mm using the supervolcano.

And now I've verily leisurely cobbled some concepts together and I've only gained 8mm!

I really was thinking that switching from linear rails to tubes was really going to cut into my Z height, but that doesn't seem to be the case.

In other news, I've got a visual concept of what the remote air Slime could look like:

Heatbreak issues

While I was able to find this cool motor that has 2 independently controllable shafts, I wasn't able to find a heatbreak like this one that had a thread length of 5mm instead of the 4mm I've got. I have discovered that the white insulation is likely ceramic, as TriangleLab has this.

This means that while the 40mm nozzles, the supervolcano and the normal volcano + volcano adapter could work, stock volcanoes or v6 + volcano adapter doesn't. 

Spacers and TIM

I'd also need to look into a long M6 tap for the 30mm alu spacers. For now though, 3 9mm spacers could work. I'll see what thermal interface material options are out there for 300C operating temps.

Slime

I'm annoyed that the current Slime concept is around 150mm from the V axis rotational pivot to the front of the Slight. I've also have to think about a vacuum and Slime internal cooling, so I've decided to remove the onboard 6028. Now, I think 100mm is possible.

A few days ago, I found out, among other things, that (FR4) dust is pure poison, especially the very fine particles from specific materials and not the larger shavings from plastics and metals. 

I was already planning on HEPA filters, but I wanted to avoid the need for a vacuum and instead use the 6028 blower on the Slime. Other than blowing the particles onto some kind of catcher around the bit, I don't think I'd be able to go with that method. 

 On the same note, I want to make the printer as easy to clean as possible. This means things like centralising air intake locations so that dust only has to be cleaned in a few locations, as well as easily wipable surfaces. This is why I'm thinking of using large diameter shrinkwrap tubes as sleeving instead of cable chain / hose tube / braided sleeving (and also because I think it'll look better)

So I started to write the dependencies of components down and realised that Room > Frame > Gantry > Slime is wayyyyyy better than trying to go the other way around. Thus, I'm currently modelling the location in the room where the printer is going.

I just need to modell the curtains and bed now.

Edit 1

oouuuuuuuuuuuuuu that could be an issue. And it's not like I've got a laser measure onhand to get any precision measurements from the room so I can't just have blind faith that this is barely enough space. And I haven't even modelled the curtains in yet, which could make matters worse.

Edit 2

Quick render:

Edit 3

eeeeeeeee

I've just gone around to get more dimensional accuracy of the room. This is the curtain rail that I've just modelled. I'll have to figure something out tomorrow.