@o_lampe Nozzle right now seating at +7.8mm height from bottom of XY-top, which I will need to lower to +2mm height by adding 6mm length on extruder back-plate to move it slightly lower. Then bed only need to "extend" over Z-bottom by 2mm, which is already achieved.
I'm going to print testing parts of XY this week to test it out, and see if any adjustment needed to the design.
During the further building, I realize the internal frame is really not "easy" enough to do maintenance with.
After some CAD experiment, I change to this design to allow XY-top detach from Z-bottom.
Total size is still big, 500x360mm at Z-bottom, and 500x400mm at XY-top. But this looks more "normal".
The other arrangement has 360x360mm Z-bottom, forming a "T" looks. But it looks really odd so I abandon it.
Some more designs tweaks, then go on ordering those 2020 extrusions and print all parts to build it.
@o_lampe
That's another compromise for ease of maintenance.
Entire extruder (inc endstop hidden behind) can be removed with 4 screws (plus PWR and CANBUS wire).
Belt can be removed by 1 screws.
L-extruder has +/- 0.5mm Z travel range for Z-height sync with R-extruder (which has BLTouch)
Dragchain and X-carrier will be printed as single unit later to reduce parts count. I've them as separate pieces to tryout different design instead of reprint entire thing)
Extruder -to- X-carrier alignment block need to be redo later as single longer block at middle.
I'd tried X rail on top design. It work well with Bondtech LGX + Slice Engineering Mosquito combo, basically sandwich the X-carrier between them. But with E3D Hermera there is not much option to move rail to the top, since the mounting hole is on the side.
Working on this easy to build/maintain IDEX for a while... mechanics nearly done.
The outter-frame (3030 alum extrusion) is sized 550x400x550, with printable area 170x170x250. Not exactly "compact" but that's the cost of IDEX.
Fundamentally it's CoreXYU motion system, 2 motors driving Y, and 2 motors driving XU (CoreXY belt loop).
The whole XYU seating on 2020 alum extrusion inner-frame, which make the building and maintaining easier, a hard lesson from my previous builds.
Belt tension adjusting from front idler tower with hex screws, easier to access.
I decide to go with E3D Hemera XS and Duet3 1LC, because: a) reduce number of wire; b) I think it's possible to add watercooling the whole heatsink/motor/1LC assembly at later day.
I probably need to work more on Z-axis later to improve some design, but for now I need to do electrics first to get it moving.
Stay tune.
@infiniteloop I got it works as you described. Thank you!!!
Some detail for future reference.
Duet [PANEL DUE 5V_EXT] ==(orange)== Relay [JD-VCC]
Duet [PANEL DUE 3.3V_EXT] ==(green)== Relay [VCC]
Duet [PANEL DUE GND] ==(black)== Relay [GND]
Duet [out3-] ==(yellow)== Relay [IN1]
Duet [out4-] ==(blue)== Relay [IN2]
Duet [out5-] ==(brown)== Relay [IN3]
config.g
; Laser mode
M452 C"out6" R255 F200 ; Enable Laser mode, on out6, with max intensity being 255, and a PWM frequency of 200
; FAN-as-IO setup
M950 P0 C"out3" ; Red Laser
M950 P1 C"out4" ; Laser Enable
M950 P2 C"out5" ; placeholder
No strange behavior during power on nor power lost. Everything looks good.
Note: the board next to relay is isolated PWN to 0-10V converter, in case someone wondering.
@T3P3Tony Still acting odd...
I now have...
No external 5V PSU, all power by Duet's 5V.
Duet [PANEL DUE 5V_EXT] === Relay board [VCC], which jumper connect to [JD-VCC] to power coil
Duet [GND] === 24V PSU [-V] === Relay [GND]
Duet [out3-] === Relay board [IN1]
Duet [out3-] === 4.7K Ohm === 24V PSU [-V]
And relay enabled as soon as power on.
I check the relay board's schematic, and I think it's neg-side-controlled. So having pull-down on the [IN1] actually ground the [IN1] and cause it enable instantly at powerup.
So if that the case, having pull-down on the [VCC] is actually kind correct?
@T3P3Tony I'm currently have 5V PSU connected as isolated supply to the relay coil
So on the signal side there is really no GND.
Is this going to cause some odd problem? Draining the board instead of pulldown signal?
@T3P3Tony I managed to get this work by...
[PANEL DUE 5V_EXT] === Relay board VCC
[PANEL DUE 5V_EXT] === 4.7K Ohm === [24V PSU -V]
If I do...
[out3-] === Relay board [IN1]
[out3-] === 4.7K Ohm === [24V PSU -V]
The relay will enable when powerup, and remain on when power lost for a long time (probably until PSU completely dry)
Did I do something odd?
Thanks in advance!
@T3P3Tony
You mean in series between Duet and relay board?
Add note...
I've 24V and 5V PSU -V connected together in the previous testing.
I also did following testing:
##Not using external 5V PSU##
[PANEL DUE 5V_EXT] === Relay board VCC
[out3-] === Relay board [IN1]
[PANEL DUE 5V_EXT] === Relay board JD-VCC (powering relay coil with Duet's onboard 5V)
[PANEL DUE GND] === Relay board [GND]
##Isolate 5V PSU##
Not connecting 24V and 5V PSU's -V together.
[PANEL DUE 5V_EXT] === Relay board VCC
[out3-] === Relay board [IN1]
External 5V PSU [+V] === Relay board JD-VCC
External 5V PSU [-V] === Relay board [GND]
In both scenario, at power lost, there is ~2.7V between [out3-] and [PANEL DUEL 5V_EXT], same as original setup.
I'm bench-testing my laser rig using Duet3 Mini5+.
I've...
[out6_buffer] === PWM-to-Analog converter for 0~10V laser power single
[PANEL DUE GND] === Relay board [GND]
[PANEL DUE 5V_EXT] === Relay board [VCC]
[out3-] === Relay board [IN1]
[out4-] === Relay board [IN2]
[out5-] === Relay board [IN3]
[External 5V] === Relay board [JD-VCC], to power the coil
And in config.g I've...
; Laser mode
M452 C"out6" R255 F200 ; Enable Laser mode, on out6, with max intensity being 255, and a PWM frequency of 200
; FAN-as-IO setup
M950 P0 C"out3" ; Red Laser
M950 P1 C"out4" ; Laser Enable
M950 P2 C"out5" ; placeholder
The bench-testing (not wiring to actual laser) seems ok. M42 P0 S1 enable IN1 relay, and M42 P0 S0 disable IN1 relay. P1/P2 also doing the same thing, which is good.
However, at power lost (ex: unplug Duet3), between [out3-] and [PANEL DUE 5V_EXT] will jump from 0V to ~2.7V and slowly bleeding away. While it's not enough to trigger relay, it's there. Same case for [out4-], [out5-].
Is there way to ensure that, at power lost, it stay at 0V ? As I plan to switch to MOSFET later.
(edit: better writing to avoid confusion)
Change the subject for better searching 
Titus
@Phaedrux said in Watercooling, heat-chamber, high-temp 3DP build (2nd attempt):
Would you be able to share your config set? It may prove helpful for new users trying to setup an IDEX.
Will do once I get it cleanup a bit, it's quite a mess right now 
Titus
During calibration testing I figured the temp X/U wiring is really too temp to use even with simple calibration. Solution: get it drag-chained
Until next time
Titus
Gauge indicator is super fast to use as Z frame leveling probe bar, then just use hand to rotate the Z motor leadscrew to make Z frame level on 4 corners.
And then, the 2 screw detachable BLtouch mount for G29 meshbed leveling.
Achieve 0.020mm mean error, HAHA!!!
Next... start the X/U calibration...
Until next time
Titus
I got all the wiring semi-done now. Need to redo X/U with drag chain to make it cleaner.
Cooling loop is using customized alum distribution block I'd from other projects, Probably oversized but it seems works. Yes it has 3 loops, one reserved for Y motor later. Haven't run the pump yet.
After lots of try&error I managed to get 4 independent Z motor running G32 auto bed calibration with "probe bar". It's working but quite hassle to use as I also need to put 50mm block during the probing.
Basically I use M291 message with input-response to control step flow. Moving XY to Z1 motor location > place probe bar + block > probe > remove probe bar + block > Z2 again > Z3 again > Z4 again. It take quite a while to finish.
I will see if using traditional gauge indicator will make G32 operation easier. Since bed is quite ridge I don't think I need to use G32 frequently.
And then... put BLTouch on X for G29 meshbed, maybe make BLTouch detachable to avoid long-term high-temp chamber exposure.
Until next time
Titus
@baird1fa said in Watercooling, heat-chamber, high-temp 3DP build (2nd attempt):
Can you use stall detection for the z probe? But I have a BLTouch in my heated chamber. I run it up to 70C and so far it’s fine.
I dont think stall detection work well with Z leadscrew...
@fcwilt said in Watercooling, heat-chamber, high-temp 3DP build (2nd attempt):
What are you going to use to as guides for the bed frame - rods or linear guides?
I have 2 linear rails on the left side vertical column to structure on X/Y direction holding, where Z is seating on 4 leadscrew motor.
Titus
Mechanical is most done now...
Y assembly (up side down)
Front view
Electronics and water cooling side cabine
Yes that's Misumi cardboard box as temp panel
And yes, this has 4 Z motors, as I figure it's easier/cheaper for me to get the same rigidity with 4 Z motors on each corner, than other 2 motors design which all require stiff Z frame for structure support.
I need to find a way to do Z calibration as I don't want to have BLtouch seat in the heat chamber. Maybe I will do a remove-able Z-probe bar to use flat top as reference point, we will see.
Until next time
Titus
@mrehorstdmd The SLA printer seems pickup a bit in modeling community. But FDM is really going no where. I've no clue why since I just move here 2yrs ago.
I'm doing PETG all around right now to during prototyping stage, and then going over to PC print. 2nd attempt has more 2D-only design which should ease the machining if needed.
2nd attempt here:
https://forum.duet3d.com/topic/17078/watercooling-heat-chamber-high-temp-3dp-build-2nd-attempt