Hi guys,
I'm playing with my new extruder and would like to know how much it extrudes in a real print.
Is it possible to display extrusion volume in DWC? Printspeed, layerheight and layerwidth? should be available for calculations.
I extruded in free air to get ballpark numbers, but real life is different.

@gtaman
It's actually the same:

• create a global variable blockDaemon
• set global.blockDaemon = true at the start of the M300 file
• set global.blockDaemon = false at the end

Then anyone using Daemon.g for real can add these lines

while global.blockDaemon = true
          G4 S1000

Had my first simpleFOC project running today. It was an old brushless gimbal controller without encoders and with 8bit mcu.
I was able to control two motors independently and relatively smooth (USB power only)
The atmega328 was also at it's limit, but I'm now confident it will work well with the right mcu.

@m0ck1nj
Check the TB6600 datasheet. If it is OK with 3.3V signals on step, dir, enable you can wire it directly.
If it needs differential signals or 5V you can use the much cheaper expansion breakout board

First print today

Instead of a benchy, I tried the extruder-woodgrain test. Yes there is some, but hardly visible. The corners were sharp and even, that was a relieve. The close loop PID setting are quite soft, so I expected worse...

At the top third, the printspeed got so low, that the filament overheated. 10°C less temp and it was nice and shiny again.

Hi gents,
I started pondering the idea to build a hash-printer with the least amount of hardware. The video of the original design shows the typical shaft & dual belt approach we've seen on H-bots and cross-gantry printers to avoid racking.
But I want to use a dual roller constraint as I did on other occasions before. I wasn't sure if that would also work with two beams per axis, so I cobbled together a quick and dirty test rig.

To make it clearer how to wrap the Aramid fishing line around the four rollers I started with a drawing:

This is the Y-axis only, imagine two more extrusions horizontally to build a '#'.

And finally I made demo video to show how easy it is to move the beam from only one side without racking.

@jbergene

According to this picture

• positive X goes to the right
• positive Y goes to the back
• positive Z goes up

@dc42 said in Smart Effector including toolboard-capabilities?:

It's clear to me that the Orbiter could not be used with a Smart Effector made to the current dimensions. We would need to increase the rod spacing to at least 80mm in order to accommodate the various parts of the extruder. We are looking into this, however it would make it unsuitable for the smaller delta printers.

Hi dc42,
I just stumbled across this thread and wanted to guide you back to 2016 , when we discussed the cycloidal direct drive. (I still have it laying around)
I've made an 45 degree adapter for it, that suited the smart effector pretty well.

Another way to mount it, was the split motor/gearbox idea.

I could try to reuse my motor and design a BMG-drive for the Smart effector?

Hi devs,
based on the "extrusion volume" thread, I also think a back EMF calculator as DWC plugin would be helpful for tuning.
The required parameters are almost completely known for the calculation. It only misses coil resistance and inductivity (AFAIK)

Since my Duet boards run on their own network, I don't have access to the EMF calculator at reprapfirmware.org

If we could integrate it as plugin and use 'live' values from the current object model/gcode file, we'd have a nice tuning tool

@nikscha I like the idea. It's like the tool-change macros.
But there is also a problem when you retract / unretract within a toolchange.
Maybe you can solve your problem by renaming G10/G11 to G10.1 and G11.1 via postprocessing. Then you need only one macro for retraction (which also contains the real G10 move)

@Notepad In my theory, 20 teeth is the worst, since if syncs "perfectly" with the 200 steps/turn torque curve.
21 isn't a prime number, so I'd go for 19 or 23

@luc said in Very slight systematic waves every about 2mm on the prints:

I tried printing with a 0.3 layer instead of 0.2 and got no change.

This should at least change the distance between the lines?

Your motors are perfectly fine. What we discussed about resonance is a common thing among steppers.

@dwuk3d I'm not sure if this is still an issue anyway.
But when you use two motors on the same belt, it might not be a good thing if they don't move super-synchronous. Worst thing would be loosing steps, when the motor who's trying a headstart is too weak to power through.

@Notepad said in Very slight systematic waves every about 2mm on the prints:

you might have a printing speed close to the motors resonant frequency

Interesting stuff! In car gearboxes they often use gears with a prime number toothcount to avoid such stuff. There it's torque-curve related, which is similar to the stepper motor.

I wonder if the resonance frequencies would be an issue with 17 or 19 tooth pulleys?
I may resin-print some pulleys to test this theory.

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

M569 P1.3 S1 D2 ; driver 0.5 goes backwards (Z axis) - changed to 1.3 forwards

When CanFD was new to RRF, it was a golden rule NOT to spread drivers from the same axis across different boards, but I guess the timing/lag issues are now under control?

Hi guys,
after seeing a super cool video of a coffetable with a carved spirograph pattern, I want to build a CNC version in smaller scale. I found a different version with external gears, I want to emulate with geared steppers:

It almost looks like a 5-bar SCARA, but the motors moving the arms work with continuous rotation.
I thought of using the extruder mixing ratio for all three motors to get the typical spiro-patterns.

But maybe there is a better solution to go beyond the spiro-world?

@luc It could be the infamous dual drive extruder pattern. Do you have a dual drive extruder?
Maybe the filament tensioner is too tight then?

Does the same pattern appear on all sides? If it's only on the opposite side, you might have a mechanical issue with this axis. ( damaged idler bearing or wobbling idler?)

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

Z0, X1,Z1,Y,X2,Z2, U1,Z3,V,U2,Z4, Y2

, Which in RRF will be XYZUVABCDEFG

Just call it Alphabet kinematics , because there aren't many unused letters left

@dwuk3d In the end we'll see a conveyor belt bed with dozends of tools heads zipping around simultaneously...
But seriously: you could do the same split_the object_trick in a big scale manner.

• Build two independent printers with 4 heads each
• place them above the looong conveyor belt with a certain gap
• print parts 1 + 3
• move the belt and print part 2 + 4
• move back and repeat

@dwuk3d As long as the belts along the crossbeam aren't aligned properly you won't see accurate positions anywhere else on the bed.
But it's good to have the theory behind alignement solved.