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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. 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 !

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.

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

I wrong a bit! just to shorter the 4 stock UM screw heads of the UM2 print head !

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.

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.

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 .

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

It's the New Year now ! best wishes to all

Hi to all! Hi Neotko! Great ! that would damper well the bed vibrations and I hope that will improve your print results

Bonsoir à tous ! pour faire simple

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.

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

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

Also, check if the hot end cooling fan turns when printing

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

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 !

Great job Neotko !

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

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

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

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.