Best posts made by o_lampe

One thing not mentioned by anyone is the G31 probe offset. Are you sure it's OK?

To celebrate the new level of 3D printing named conditionals and variables I thought it would be funny to rebuild my old Prusa i3 to an IDEX with infinite Y-axis.
A macro would then apply Tic Tac Toe rules to the two feltpen-tools which actually write X and O to a foil on the bed.
The infinite Y-axis would then scroll the foil around and thereby wipe off the nonpermanent ink.

With this thread I want to encourage other users to think out off the box and come up with their crazy ideas to celebrate the amazing Duet team and their breakthrough Firmware.

@jay_s_uk
It's Q1 that fell off, but C1 is also written close to the pads and can easily lead to confusion.

@taconite said in D-PATCH:

The pieces of the bayonet that lock the tool are angled so a downward force is created by the rotation of the bayonet. It is locking onto 3 zylindrical pins that are placed 120° apart from each other so that the locking is uniformly

This part is the most interesting detail to me.
I'm currently planning to make a tool changer for my CoreXY with a Titan extruder. I want to change the heatsink only and until now I'm on a magnetic twist & snap road. Your design looks much easier to implement, but a CoreXY can't lower the effector to release the heatsink.
Anyway, I'll mention you in my Biography if I steal this idea from you

@o_lampe said in Texture mapping with feltpen carousel?:

Maybe my idea is two steps forward in the agenda...

Let's get crazy and talk about step three in my agenda:
Build a Delta printer onTop of my CoreXY and attach an effector that holds the feltpens and solenoids. (No carousel required)
Then print a layer with CoreXY & park the printhead.
Then dye the perimeters with the Delta using one felt pen at a time. The data is extracted from the original gcode and can include mixing colors and patterns.
Then park the Delta and go on printing.

Print-dye-print-dye (or PDPD) as I'd like to call it in my biography

Will it require two Duet boards or is it just a matter of toolchange?
I wouldn't care since this is IMHO the best way to get brilliant color texture mapping without a multicolor mixing extruder.

@garethky
I have a bit of programming experience, but I'm relatively new to the RRF conditionals.
To me it seems, your routine breaks when the momentary value is close enough to the target value?

That doesn't tell you the temp has stabilized, it's just a coincidental match.
The real temp graph could be in a wild overshooting phase and you won't notice.

What really tells you the temp has stabilized, is the difference between momentary max. temp and min. temp.
If this difference is smaller than your threshold you're ready to go.

@Tpmoses
I can't comment on the BLtouch, but talking about losses Add a USV to your printer or a big battery to avoid power-issues.

Hi guys,
inspired by other succesfully implemented tool changers, I want to try to enable my E3D Titan extruder to swap heatsinks to have different nozzles or colors available.
Therefor I have to split the cover in two pieces and only keep the upper half. The lower half will be designed to hold the tool in place and guide the tool into parking position.
Today I made a first test, if the steppers are strong enough to plug/unplug the heatsink. Turns out, it's a piece of cake

Here's a short video
Try not to laugh!

Just found a new playground for feltpen-layer inking:
I made some monochrome Lithopanes and realized, how easy it would be to add some colour by inking just the right places between each layer.
Finally a green Yoda Lithopane

Hi guys,
back in Aug. 2015 I introduced my idea of "Four SCARA printers on one bed" to the RepRap community.

It was not possible then, although handling the collision zone wouldn't have been too difficult.

Now with conditionals and variables (soon) it would be much easier to implement. I'm not sure if the concept of semaphores is possible with meta commands, but the communication options between various mainboards to implement a semaphore-handler are there.

What would be required to have four tools work simultaneously on one part?

• each tool has it's private area to print undisturbed
• We'd need collision zone definitions in the M208 print area ( left and right neighbour)
• each tool has it's own small Z-axis to make mesh bed leveling and Z-hop possible.( a servo or linear actuator will do)
• only one mainboard has full control over the real Z-axis and it requires green light from all other printers, before it moves the bed to the next layer. (semaphores)

How to handle the collision zones?
Each time the lookahead planer identifies a track that leads into a collision zone, it triggers the semaphore handler. If the zone is free, it reserves the semaphore.
If not, it goes into pause mode and resurrects when the semaphore is free.
An advanced semaphore handler would tell how long the zone is blocked and if possible, the printer who wants to enter the zone would run slower to avoid going into pause/resurrect.

What about the Slicer?

• the part has to consist of four sections. They'd be sliced with different tools and in consecutive order. That makes it easier to split the gcode up for each printer.
• there might be tracks, which start or end in the collision zone. This problem requires more coffein, I haven't found a solution yet. Maybe the whole part has to be split in eight sections? Four private sections and four collision zones.
  A postprocessor would then sort those zone-tracks to the best matching tool. (depending on start-, endpoint of the track) A track that starts and ends in a zone would need a preset priority (each printer takes care of it's left zone)

Is it all worth it?
I think so. In 2015 no one would've tried to print parts bigger than 30x30x30cm. Newbies who asked, how to build a 1m x 1m x 1m printer were treated as dreamers.
But that's no longer the case. The demand for bigger prints is growing and printing these in less time gets you in the winnerzone.

That's it for the moment. I re-introduced you to the idea and probably have to wait another 5 years to see it realized. I won't be able to try it out myself for financial reasons, so it's up to you

@j3d
I'd also scream with a current 2 times of max. current.
Even 0.4A is too much, better go for 80% of max current or the steppers will get pretty hot.
Did you try to run the motors without the Bed (no load)?
Where does the noise come from, the leadscrews are OK?
Greased and run-in?

Also your test code has no speed limit. Try to add a

G1 F180

before G28 Z, which is half speed. Those leadscrews get really loud when driving too fast.

@Rushmere3D said in E3D Titan tool changer [Blog]:

Prusa MMU2

That MMU2 is a funny thing. Reminds me a bit of a photoshopped 5x Wade extruder I published 2015:

The interesting part is the ramming and the cooling moves I hope to have the chance to try out without having a MMU2.
But first off all, I have to disassemble my hotend to remove the Jam and do some failure cause research.

May I chime in here? It's just a little self-promotion, so you'd been warned to read further

@arhi said in Two Precision Piezo boards in parallel on one input possible?:

VERY fast probing speed, if your Z speed is slow it will just not work

That's why I gave up on Piezo's.
But now imagine you had a barometric sensor which would trigger reliable, no matter how slow you move Z?

I haven't thought of the Cat whisker as underbed sensor-array yet, but it would be nice to find a working solution for that scenario as well. (each sensor has the same I²C address, which is the only disadvantage I see) (*)
Excuse me, for trying to recruit some assistance in developing such sensor.

//edit
*) The solution might be a number of aircussions below the bed, connected with tubes in series and one single baro-sensor to detect the touch.

The first step was easy.
I made a bracket that fits onto the existing X-motor.
Also extended the idler-shaft. Not my best design, but it's only a fun project moving feltpens around.

@lord-binky
The FETs on the fans have to withstand 24V when switched, no matter if the fans are in series. Unfortunately it's not like series resistors...

This is the latest report:
I've updated to rrf3.2, changed a few minor settings from the config file I got from @Phaedrux (Z motor and probe needed to be inverted)
But still...

I also changed the z-probe port from zprobe.in to e1stop, but no change.

Anyone any idea? @fcwilt I'm now on rrf 3.2, you can chime in anytime

Is it possible I have my XY stepper config wrong? Their connectors would fit the Molex headers in both ways. They move the right way, but you never know...this is my last straw.

Hi folks,
today I tried to print ABS with my new enclosure.
I heated the bed to 110C and started the print.
After the hotend is at target temp, I usually call G28 followed by G11 and the print begins...
That worked without problems until now.
The probe went down 3 times as I've set in the config. But this time it throws an error:
probe readings not consistent

In fact, the nozzle digged into my LokBite surface and ripped it apart 10mm long. not funny!!

I'd expect the printer would stop at an error during homing?

Today I made the toolholders, which isn't perfect yet. I thought, I could design a universal tool, but the belts are rubbing on the unused beltclamp. Have to saw them off or reprint two versions. No biggy! Tomorrow is config-time. Never had a IDEX before, it's gonna be a headache to find all relevant infos (and understand them )

PS: This might be a nice diode-laser toolholder too

@OwenD said in Robotic manipulator using duet:

I would be able to do a certain amount of coordinated movement by calculating the time required for a manipulator move and programming the robot to complete its movement in teh same time.

That's a perfect usecase for semaphores instead of blindly relying on the other robot to do it's duty.
Thousand of slapstick scenes in movies come to my mind, where something (someone) relied blindly on other actions to happen...

@fcwilt said in G30 S-1 is giving me heart stitches:

All right - v3.2 - good job!

I'm not so confident anymore, since I have to get used to the new gcodes and parameters. Will have to use the wiki quite often.

Printer is currently working, can't get the config or homing files.
BTW: I had to make a new PID tuning and write config-override, I'll post that too. Soon.

@EmmanuelG
over night I had an idea, how to solve both problems at once (the torque problem at start and the nonlinearity)

Just replace the Z-stepper with a Spindlemotor and add a Mini-scissor

The torque will be high at Z=0 but the Z-lift will be low.
At the end of the move, it will be reversed.
Feel free to ask, if you have further questions
o_lampe

BTW: I figured out a method to have many tools on the X-axis.
Two years ago I developed software and a circuit that allowed me to control geared dc motors with encoder like steppers.
Now there are big motors suitable for heavy lifting (eg. rotary delta), but also tiny "N20" motors with metal gearboxes. They would fit perfectly in the toolholder I designed for this project.

The tools would all use a single belt, like "shapeoko CNC" does. Kind off Rack and Pinion.
Controling them would either require dir,step and enable pins for each tool, but with a "shift register" for the enable signal, I could control them all_at_once. (shared dir and step signals) Pretty handy for toolchanges, where lot's of tools have to travel from left to right and vice versa. (worst case is selecting the last tool and park all others)

Here is the test-bench with the big motor, which still needs to become a real PCB...
(hint: is there PCB designer with some spare time? Contact me )

Question is, what would you do with tons of tools?
The feltpen- carousel comes to my mind. A single extruder and a few different colored pens for texture mapping.

@peterartechno
A single mat is 250x250mm sized and has 1300W??
I don't think they take forever to heat up. Unless the bed is a monster chunk of metal.

Just an example: my printbed is 300x200mm and has only 180W. I'd call it a bit slow with heatup times of ~5min. (6mm MIC6 plate)

@fcwilt said in G30 S-1 is giving me heart stitches:

What sort of Z probe do you have? How does it work? How is it mounted?

Why is the Z axis min set to -2?

It's a conductive probe with NPN output. It's mounted to the extruder assembly.
The Z-axis is -2 because it allowed me to adjust Z height easier.

Hi @EmmanuelG
very impressive idea!
I had to fight with nonlinear kinematics too and I was able to build a servo mechanism, that compensates the lack of torque at the beginning and keeps the whole movement relatively constant. It's a totally different usecase and linearity wasn't mandatory, but maybe you can find some clues, how to modify your stepper-drive.

Short Video