Sovol SV08 Multiple Motion System Upgrade.

[dwuk3d]

Quite pleasantly surprised to find that slip rings not as expensive as I was expecting - this one for example looks to me more than enough for my needs

Re -print head alignment / dimensional accuracy- I'm think I might get a second ball probe to have on the same arm - with the camera in the middle.

I could then probe each head 4 times - with the arm in two positions.

Should from this be able to get pretty accurate dimensional accuracy /adjustment info.

All of the probing points will need to be in the central area where all of the heads can reach,

Might even be able to do two lots of probing at the same time if I can make the heads as thin as possible in the X direction.

Will also switch over the servo to a stepper motor.

[dwuk3d]

Think I might need a Roto toolboard for when I add an INDX to my front gantry.
Nb/ my picture of the INDX toolhead is slightly bigger than the real thing according to Bondrech.

Might get one now as it could also help with reducing the width on my rear right extruder too - although I suppose I could just rotate the 1LC upwards so that it doesn't take up so much space.

[o_lampe]

I wouldn't use a slip ring for a heated bed. At least I wouldn't trust the Chinese specs too much.
Maybe you can get away with it by using a 230V heater with a SSR? But that opens another rabbit hole.

[dwuk3d]

@o_lampe the bed is already mains with an SSR - so I was planning on putting the SSR output through the slip ring, plus the temperature sensor.

Are you saying that would be ok - or that I should look at a better quality slip ring?

I suppose continuous rotation would only be a novelty feature - I wouldn't need a slip ring for 90,180,270,180,90,0 rotation - which is the main reason fir me adding it.

So I could drop it if a good quality one is going to be massively expensive,

I could always disconnect the cables and use a bambulab cool plate for continuous rotation demo's.

[o_lampe]

@dwuk3d Almost forgot the thermistor....If you can, double up the lines for it, to reduce false readings from bad slip ring contacts.
If you already use an SSR, you know the possible downsides of bang-bang bed heating. I did that for a long time and it didn't bother me.

A more general concern is your project-philosophy, if I may critize you.
As a former project manager, I know it's important to set three things before you even start:

• define a goal (and stick with it)
• define a timeline (not so important here)
• define a budget

Especially ignoring the first one often leads to unfinished projects...just saying

[dwuk3d]

@o_lampe thanks good idea about doubling up - that slip ring has 6 connections and I only need 4 - so I can double up the heater ones - 20A 230v would be masses more than I need.

I haven't done enough actual printing on the SV08 to find any heat bed issues - but it seems to maintain temps ok - although I did get a failure with the PID tuning,

Point taken about the project approach.

One of the advantages of not having a sponsor is not being restricted to specific goals, dates or budgets.

But you might be right that there is a risk of me losing interest in the project - especially as I've just booked a QM2 cruise - so really want to do a model of that ship before I go - so that I can get some comparison photos.

So far all of my changes are just reordering things that were already in the plan (or when better technology like INDX vs Stealthchanger comes along).

On this subject though I am about to change around my bed slinger approach a fair bit to not have a longer bed - but instead just move about 150mm - and add the ability to link multiple SV08's with this ability together - to get 350x700 or 350x1050 for example - with the build plates slightly overlapping the heated beds.

Will probably do dual gantry - but only single heads on the second SV08.

That will then deliver my original plan (and most popular video so far) - see Prusa Multi Mini.

My immediate plans (which I may change)

1. Get 3 headed build working well - with fully parallel, faster printing
2. Rotating bed
3. Angled extruder on rotating bed
4. 150mm bed slinging
5. 2nd linked or independent SV08 with 150mm bed slinging
6. 4th print head - probably on stealthchanger to allow for offloading.
7. iNDX - which may slot in earlier if previous steps go past December.

[dwuk3d]

Still away - so no progress on actual printer.

A few more Bondtech INDX diagrams (Renders from Autodesk Fusion) - with some options of where to place the PTFEs.
Might actually be better turning the whole thing around and having the PTFEs on the back with the head reversed on the rear gantry.

With the front gantry having the IDEX Sovol print heads on it.

With PTFE's starting at the front of the flying gantry.

with PTFE's starting at the top.

With improved modelling of the air pipe.

[dwuk3d]

Having trouble getting the same Hanpose Nema11 x 28 lead screw motors for last extruder in a reasonable time.

Considered ordering normal Nema11's, couplers and lead screws.

But decided to go for these instead - will have to take them apart and cut down the lead screw - but delivery in a few days.
I also get a free linear rail and carriage which might be useful -

Also ordered a second ball probe for dimensional alignment

[dwuk3d]

@dwuk3d said in Sovol SV08 Multiple Motion System Upgrade.:

@droftarts Will be interesting to see if the video gets much pick up as it is certainly a very elegant design and could completely remove the need for me to add single nozzle multiplexing on top of tool changing - plus also remove the need for lots of electronics and motors etc. for the extra tools and multiplexer

Might do a better version of the video with a few animations of the different options next.

Finally got round to starting on some INDX/SV08 animations - which will eventually include my currently planned 2 Gantry, 3 Toolhead, rotating bed version - with some full multi colour ship print simulations.

Blender is very powerful - but I find it very hard to use compared to Fusion - I find I have to google at least half of the commands, including ones I have used only a few minutes ago - due to the odd keystrokes with combinations of modifier keys.

Doesn't help too that I am using a Mac - whereas most of the documentation and explanation videos use the windows versions of the keystroke modifier keys.

The INDX on SV08 renders I did last week got retweeted by both SOVOL and BONDTECH which was good.

[dwuk3d]

Started making some progress on the Trindex SV08 printer again.

Did some simple size test prints - and started getting issues with Z offsets.

I think I will have to improve my Z alignment - either by using 'voron tap' on all of the tools, or possibly using the ball probe Z offsets.

Plus a more serious issue.

When serial 3 headed printing - but with parallel print priming and colour switching between T1 (UV) and T0 (XY) - T0 consistently layer shifts about 10mm in the X and 5mm in the Y - and the layer shift if quite fast.

I had this issue a while ago and thought it was related to the Z hopper - but I have turned the Z hopping off on XY and are still getting the issue.

If I do similar prints with T2 (WV) and T0 (XY) - both of them print fairly well.

I have seen some oddities in normal alignment testing with X and Y sometimes jumping when I switch between tools - so not sure if it is an issue with my config, macros, slicer GCODE or a 3.5.4 problem.

Will continue investigating to try and get the problem to occur in a more simple gcode file without parallel printing.

Or might just try setting up another tool - T3 - and assign that to the UV - to see if I get the same issues.

[o_lampe]

@dwuk3d said in Sovol SV08 Multiple Motion System Upgrade.:

Plus a more serious issue.

I might have to do with endstop offset adjustment.

[dwuk3d]

@o_lampe thanks - do you mean G92's.

I don't think I have any of those in my macros that would be invoked mid print - the problem occurs mid layer 2 = when the printing switches back between T1 to T0. But I will check.

I think though that something is changing the endstop offsets for the Y and Y axis and then jumping them quickly to the new position.

I have noticed some unexpected behaviour when moving around between tools and mapped axis - but haven't really found a way to recreate the issue.

If I don't manage to resolve the problem I suppose I could try removing the X and Y mapping completely from the T1 and T2 tools definitions , and instead post process the G0-G3's to specify U,V & W instead when using T1 or T2.

Ps - the sequence is
Homing.z offsets
Motion system 1 - layer 1 - print T0 section ok
Motion system 0 - layer 1 - wait for pre-heat, delay, preheat, T1 print prime, wait for print T0 to finish, T1 print layer 1, move Z up to layer 2, T1 print layer 2.
Motion system 1 - layer 2 - wait for pre-heat, delay, preheat, T0 prime for layer 2, wait for T1 to finish, T0 head jumps to incorrect position, T0 print layer 2 - with layer shift

[droftarts]

@dwuk3d said in Sovol SV08 Multiple Motion System Upgrade.:

Finally got round to starting on some INDX/SV08 animations - which will eventually include my currently planned 2 Gantry, 3 Toolhead, rotating bed version - with some full multi colour ship print simulations.

Nice animations!

Blender is very powerful - but I find it very hard to use compared to Fusion - I find I have to google at least half of the commands, including ones I have used only a few minutes ago - due to the odd keystrokes with combinations of modifier keys.

I keep shying away from learning Blender, but then I don't need to animate or simulate anything; Fusion 360 does everything I need for now. I know some people use Blender for all their CAD work, but that seems a bit masochistic.

Doesn't help too that I am using a Mac - whereas most of the documentation and explanation videos use the windows versions of the keystroke modifier keys.

I use a Mac too. So far, Fusion 360 has worked well, I haven't had any issues. A couple of years ago I was running it on an 2013 MacBook Pro, where performance was lacking when working with large models and rendering, so updated my desktop PC (I7-10700K with RX 6600XT - runs Windows 10/11, Linux, and MacOS with OpenCore), but after spending a long time trying to get it to run well, I ultimately bought an M2 14" MacBook Pro, which has been brilliant. Haven't turned on my PC for a long time! If I need to test something in Windows, I use Windows 11 ARM on VMware Fusion.

The INDX on SV08 renders I did last week got retweeted by both SOVOL and BONDTECH which was good.

Nice, fame at last! Maybe they could send some dev kit your way.

Ian

[dwuk3d]

@droftarts Yes I really like Fusion 360 too.

I did try doing a whole ship model in Blender - mainly due to the perspective corrector add-on - which is a really good way of tracing 3d objects when they are at an angle or have perspective distortion.
Ultimately though I gave up when print quality wasn't as good, plus having the spend ages wrestling will the models to correct model mesh errors.

I'm still using a 2020 MacBook Air 8gb M1 - and it works pretty well - although it really started to struggle with this combined model - which I know would work easily in Blender. - I might upgrade to an M4 at some point with a larger screen for when I am away.

I got a PC too mainly for rendering of animations - which are about 60x faster on the 4070 Super/Ryzen7950X3D/32GB - vs the M1 GPU. Blender runs slightly quicker on Linux - but I usually do my rendering in windows 11.

Put up a couple more videos with a bit more detail, one of which got retweeted by Sovol - so fame building further. What would be really good though is if Sovol (or someone else) gets together with Bondtech to release a fully built, tested and supported INDX printer.

Free stuff might be nice - but I think it changes it from being a hobby - and starts putting pressure on to deliver. I haven't applied for the Bondtech Beta Programme as don't want to be sworn to secrecy.
PCBway have been in contact too about the triple headed printer videos - I guess having their logo on would add a certain amount of Kudos - but I don't think I need any custom PCBs - might need some CNC stuff though when I got to the rotary bed phase - but probably won't pursue it.

Makerworld Boost points are pretty handy though for filament, plus Bambulab are selling quite a lot of parts too now. Plus might partially pay for an H2D if I decide to go for one. It's not until you try and create a printer do a major upgrade that you realise how much work must have gone into the X1C to make it so good.