Posts made by o_lampe

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

Thanks - looks interesting - especially the gearing you have added.

These spur gears were printed with a resin printer using anycubic's tough resin. They don't last for ages, but I can print a whole bunch at once.
There are a few user on this board using simpleFOC with it's GCode-compliant step/dir interface.
It's a bit of a learning curve to get used to it's PID behaviour... Their development & documentation status isn't as professional as Duet3D's, yet.
In the past, I've tagged some threads with sFOC or simpleFOC if you are interested.

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

Don't really understand what is happening with my NEMA8 motor.

Their internal magnets might have degraded due to overheating? I noticed the same on some NEMA14 pancakes I used to use for extruders. They survived only when I reduced their rated current by 50%.
I replaced them with brushless gimbal motors and a selfmade simpleFOC-interface and the problem was gone.Torque/weight ratio improved a lot, too.

@dwuk3d The way you mounted the rear INDX tool bar will not work, because it blocks Y-motion of both IDEX arms. You'll need overlapping motion to have full access to the center of the bed.
You could turn around the rear IDEX arm and put the INDX tool bar to the very rear of the frame....
There would also be a problem with the number of filament-holders you've places on each tool bar unless you want 4 filament holders for each extruder + the center one available for both.

Should Bondtech be aware of your virtual design, they might be convinced by an animated simulaton. If not, try to start a kickstarter campaign...

Edit: as a sidenote, if you had a moving bed (in Z) instead of a flying gantry you could even print while you change tools. That would be a huge timesafer

@dwuk3d The NEMA8s can be pretty quick (eg. 3000RPM vs ~300RPM of a NEMA17)
They also have a long leadscrew. You could place them vertically and use an 90° arm to translate speed into force (long leg /short leg ratio) The arms anchor point could be above the center of the package to reduce sideload to the linear rail.

Why not define a "mixing extruder" from the XY-axes and the constant extruder? The mixing ratio would be fix and the current motion speed would also adjust extrusion speed.

BTW: an extrusion amount of eg. 4700mm wouldn't be even close to infinite. If you want to go the infinite screw route, you can define axes upto +/- 2^31 steps length. That would be enough to print a whole week.

@dwuk3d I played around with multicolor prints, but they all looked like (R)designed by Toys'R'us.
It was hard to find decent colors and mixing hotends where a fail, too.

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

As its a bolt rather than lead screw then it is quite sloppy - but might be able to use that as a slight advantage

Vertical slop is a 1st layer killer.
Although it might have advantages with other stuff, you sure don't want to risk bad adhesion to the bed.
Maybe you can add a spring to reduce backlash?

@dwuk3d Nice video, but I watched it without sound.
The problem with any nozzle touch probes is, you have to make sure the surface is completely clean. (and conductive too?)
I hope your homing macros are ready for "murphy's law"

@dwuk3d Those digital servos can draw a lot of current. You'd not want to block the arm or run it above the spec'd angle or the buck converter might fail.

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

Made a start on the IDEX belt design.

Not sure if I get it right: the two Y motors positions indicate a different kinematic model, it seems you want to use a H-bot design mixed with CoreXY? Or is it some markforge stuff?

Another problem might be the M800 macro. IDK if it's smart to use macros while printing dual stream...IMHO you should replace G10/G11 commands with the macro-content by your postprocessor

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

I would only use Z for layer changes, with all other Zhops and mesh adjustments being done independently with the B and C Zhopper axis.

That's what I proposed to implement in RRF while I played with the hashPrinter.

I wonder if it's possible to use G10/G11 for FW-retraction with zHop in your case? You'd have to link it with your BbCc motors. @dc42 ?

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

I will have to split each long move into segments the size of the grid.

IMO, that won't be that easy. Mesh adjustment is continuous between grid points.
And for tool No2 you'd have to know where tool No1 is to compensate No2's adjustment accordingly.

@dwuk Still looking good for a first attempt. I guess you had mesh levelling off?
Maybe try to dial in each toolhead independently with unaltered single-head gcode. When both work OK on their own, let them cooperate.

@dwuk Backlash won't be your primary problem when you use the "outer perimeter in one go" version of your gcode postprocessor.
I wouldn't spend too much time on it now and try to make a working proof of concept first.
You might have to redesign alot anyway, just put it on your ToDo list.

@Ce72 said in Like Z Banding:

NTC 100K thermistor on there heaters which from what I understand can be a pain to setup and not that great for the higher temps.

Bed temps are pretty low compared to extruder temps. I don't see a problem here?
Whenever a NTC failed on me, it was a lousy crimpjob or broken thermistor leg from too much motion.

@bernardomattiucci I think, the onchip memory hinders the FW to store a finer/bigger map and moving the whole data to the SD-card would lead to constant reading from SD and might cause failure.

Having a few small (slightly overlapping) maps stored on SD and loading only the next relevant map would probably work, but it'd take some postprocessing of the gcode file, I guess.
Because daemon.g wouldn't be able to look ahead far enough to do that while printing...

@Notepad said in Like Z Banding:

Its weird that the woodgrain test appears to be normal and and then your next two prints have this weird artefact.

IMHO, the difference is vase mode versus solid. Might be related to PA-settings? They don't apply in vase mode...

@dwuk Those motors are nice findings...but the small one might be too slow for anything? (15-20PPS @18degree/step divided by 100/1 gearbox) If my math is correct, it'll take 50 seconds for half a turn (outputshaft acting like hobby servo excenter)
You will also need a way to fix the tool in both directions. Otherwise the extruded filament will push it up.

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

Not sure why the adjustments are so large

It's just the difference between the configurated tool offset and trigger point of the probe.
Since they are all pretty close (-0.4ish), your bed level looks fine.

@53581 That'll do, but it's a bit overkill.