gudo
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Posts posted by gudo
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How do you 'connect' the output of the extruder to input of the hot end? A piece of Bowden tube?
Just thinking on how It could be modified for an UMO head...
Hi Amedee,
With a piece of a standard PTFE tube, not UM Bowden tube
Neotko will soon test the system with 1.75mm mod on his UMO, the above Fat IRoberti feeder photo shows his future direct feeder.
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Oh yes indeed for the rotation of the feeder
So you use bondtech knurled wheel, is it like in the bondtech extruder? (two knurled wheel with a gear somehow?)
I use the standard Bondtech 2 gears feeder, the feeder has a 1/4 turn spring unloader key to release the spring pressure of the driven gear for change the filament by doing if it need a direct atomic nozzle cleaning in the same process.
an alternative version inspired by IRoberti /Fat IRoberti Neotko solution
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I wrong a bit! just to shorter the 4 stock UM screw heads of the UM2 print head !
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Damn i missed this post! Very cool stuff gudo, big fan. Fun to see that the same idea popped twice on the forum lately but with different orientations
So i beleive that the square rod is connected to the knurled wheel (or to a gear), when the head is moving i guess that the knurled wheel has some movement too, could it increase the grinding of the filament or not?
Would be really interested in that mod for one of my printer!
Hi Didier !
Thanks, yes the direct extruder pivots freely on the print head for following the X/Y motion,
it turns around 60° yaw angle from the extrem left front corner to the extrem right back corner, the axis of this yaw rotation is in the axis of the filament, there is absolutly no impact on the knurled wheel rotation feeding, since now closed to 200 hours print works I have no any grinding issue or something else with the Bondtech wheels used, also no any backlash or friction problems on the direct feeder system.
I start soon to do tests with stock UM feeder components, stepper motor and knurled wheel, I will see if I will get the same result !?
Yeah ! it will possible to add it to one of your printer, it's a real" add on" plug and play, this will not require any modifications (hardware/software) on your printer,
With an another stepper motor, eventually we can leave everything in place just remove the bowden tube and add the direct system on the top of the machine.
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Hi to all !
Thanks for your likes and kindly comments
Here carbon filament print test
220mm Twisted airfoil propeller blade printed with the 2.85mm Carbon Color Fabb XT-CF20 at, 0.5mm steel nozzle, 0.2mm layers, 50mm/s print speed, 255° print temp, 65° bed temp,1.5mm retractation distance.
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Hi Krys ! Thanks Great New Year for you also
I had done this tinkering initially without really thinking about sharing it
Why I did this ,
First, because before when I calibrated the bed I noticed that on especially the 2 front points, the bed had move down only when I slide the UM calibration paper sheet between the nozzle tip and the bed glass without get much friction, so the setting may be distorted if not pay attention to it.
Second, In such a way that the bed is fixed without reinforcement on such a large overhang, it is obliquely too flexible, it is closer to the swimming pool plunger than to a stable platform !
The reinforcement arms do not make the bed completely rigid but have made it possible to calibrate the bed with more precision and also that it is less sensitive to the printer vibrations and possibly allow it to better withstand the pressure during extrusion, especially in its front thirds area.
By being less flexible, the nozzle crushes better the possible small blobs which sometimes occur during the extrusion without pushing the bed down too much, which is seen on the layer concerned. To keep a little flexibility nevertheless has the advantage of preserving the nozzle in the event of a collision on a somewhat too large blob
This is what has improved on my UM2 Extended
I could share the bed stabilizer without guaranteeing that it is a miracle solution, it will be up to everyone to appreciate or not .
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Hi to all
The 2016 year had inspired some of us in 3D field, we are always looking to improve our jobs and our equipement.
For a long time I wanted to print with ultra-flexible filament without meeting all the difficulties due to the bowden tube on the one hand and the disadvantages of weight and power of the direct drive with the stepper motor on the head of printing on the other hand
The flexible shaft is an interesting solution but also has some disadvantages and requires a significant addition of adjustments in a specific software to remove them.
I tried to find a compromise between these 3 systems, here are the results
Extrusion in direct with the usual stepper motor and using the components of the original extruder or those of the upgrade.
The system is quite simple by replacing the Bowden tube by a straight and rigid square shaft between the stepper motor and the feeder, the latter 2 being installed on pivot points to be able to follow freely the X/Y displacements.
There is little added weight, +/- 10 grs more on the print head, it's why it is called by Neotko " Zero Gravity Direct Drive ", thanks to him for that and also for giving some good ideas
There is absolutely no play in operation, extrusion and retraction have become very accurate by having the full torque power.
Printing with very flexible filament has become almost as easy and fast as with the PLA
My average retraction setting distance down to 1.5mm (1 to 2mm maxi)
Now my average print speed is 60mm / s
The other settings remain in accordance with the usual settings depending on the filament used.
I improved the ringing by lowering the acceleration values ??and the X / Y jerk, (2500/15 UM2 extended)
Depth of 150 hours of test performed with different filament types without encountering problems,
the videos shows tests of a hobby car tire wich is printed with the 2.85mm Recreus Fila Flex A82 Shore at 50mm/s print speed and 2mm/30mm/s retractation settings.
the Bondtech feeder parts are used here for the 2 print heads, a system with the UM stock knurled wheel is in preparation;
some other works
future UM stock feeder parts uses in a customized" I Roberti" feeder system
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It's the New Year now !
best wishes to all
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Thanks @gudo ! Today installed one of the 3 kits you made me and the bed seems so freaking nice!
Will run proper tests before/after on the next umo+
Hi to all!
Hi Neotko!
Great ! that would damper well the bed vibrations and I hope that will improve your print results
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Bonsoir à tous !
pour faire simple
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That looks really good, it seems like it can handle retractions better than the original printhead?
How long is the pbi-part and which outter-diameter did you choose? Do you feel like it can be made shorter without the loss of functionality?
Hi MTG
Thanks !
The part was machined from a19mm dia. x 37mm lenght PBI rod, test said that 12 mm rod would be large enough.
My goal was to took the PBI properties opportunity for that the coupler /heat break could serve as a hot end support also, the all in 1 part.
A well functionality depends more on a appropriate lenght of the heat zone/warm zone/cold zone which is included in the total of the minimum 37mm, dictated by the need to had enough height under the XY shafts for the all parts head assembly housing around the hot end.
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Hi to all
It's been a while since I have not posted, here just a few new PBI print head.
It now makes some tens and tens of hours that the PBI head works without problems
No special maintenance on that level.
One thing is certain ! is that I'll have trouble going back on classic hot ends uses!
Some pics of my final PBI print head, as I am an uncondional user of Biofila PLATEC which is very suitable for functional prototyping, most parts are printed with this material.
some print work samples
50mm bridge lenght
Yoda with a ton of retractations
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Hi Graz !
I have no experience of UMO
however I think it is possible to adapt a similar PBI print head that I installed on my UM2 Ext on UMO.
my "All in 1" PBI printhead works really well, it is combined with a Bondtech feeder, close to 200 hours now, mainly PLA print, without any issue , I never experienced with the UM feeder
It seems that the use of PBI requires a feeder with high torque, there have more friction than with PTFE, but no risk of sticking or deformation.
Neotko is a great specialist of the UMO and he'll be the best advice , he tested a 1.75mm PBI coupler , he'll be able to give some feedback.
I can help you to redesign a complete adaptation if necessary
PBI source : http://www.plasticstockist.com/Duratron-PBI.aspx
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Also, check if the hot end cooling fan turns when printing
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Hi !
it would perhaps be the hit of the check
because of the spring pressure PTFE tends to deform
here some alternative spring replacements
https://www.youmagine.com/designs/um2-adjustable-spring-replacement
https://www.youmagine.com/designs/ultimaker-2-spring-replacement
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Hi to all !
Biofila PLATEC material print test @ 210°
PLA standard Cura settings with 0.4mm nozzle
a really interesting material !
here , it's not yet perfect but it's encouraging !
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Great job Neotko !
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Nice! :)Did you paint everything? Why not print it in black and red?
Indeed you're right ! at this moment I had not these two filament colors under the hand, may be I'll make 2 other like this
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thanks to you !
small logos were stolen each side of my V6 car collection of 1994
it's here ! a practical application of the 3D printer
A varnish couhe and it will be ready to be pasted
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Hi to all
PET material is extruded really nicely through the PBI ! I love this material
240° print temp , same Cura ABS settings for the test
funny light effects
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Yes I think ! it could to be printed in one part in replacement of the rod + the tip attach on one side .
and the all could be mounted closer to the side panels to avoid a potential collision with the print head. -
Hi Neotko! thanks
I 'll share the bed stabilizer STL files, it's needed 2 x 6mm aluminium rods with M6 threaded tips, the bed still stays a bit flexible but much less than before, the system deletes especially all micro vibrations and possible tiny tremors due to the motion of the printhead.
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Hi to all
Success !
First test at 250° print temp of the PBI with ABS material,
Benchy was printed with the EasyFil from Form Futura
standard ABS material settings of the printer
0.4mm nozzle, 0.1mm layers, 50mm/s print speed, 0.8mm wall/Top/Bottom, 90° bed temp, 25% cooling fan, 3mm retract distance....
No any extrusion problem, no friction issue, the ABS slides better in the Bowden tube than the PLA
The diffilculty was more in the bed adhesion managing and in print temp fine tuning to find the right temp suitable to this ABS filament, I started print fisrt with 260° then slowly down to 252°.
It's not yet the top , but it's quite good print result, it was worth it to catch a good headache because of the ABS vapors, Im not used
Result after a light clean of some small dots with the fingernails,
there are 2 horizontal lines seen on the the third pic,
the first near upper the bed, it's due to the temp tuning from 260° to 252°
the second higher, it's due to a suddenly small warping on the bed
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Zero gravity direct drive extruder
in Third party products & modifications
Posted
Yay!!!
Also afaik making an adapter to a UMO head would be just a matter of changing the x4 points where it screws (I think).
Woohoo can't wait to print some filaflex on day1!
Hi Neotko ! you think right !