Show all posts by user
General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Runaway Hysteresis in Bowden tube when printing with flex?? - 5 years ago
Hi all I specialize in printing with flex and provide flexible parts on a commercial basis. Recently I decided to delve into my Bowden Cable set up in order to gather some empirical data to try to understand why some prints fail at lower print speeds while others continue on to completion with no problem even when processed and printed at much higher speeds, I thought I would post my results forby Arnold Lane 1000 - General
Re: How to improve print quality at higher speeds? - 5 years ago
I have found it advantageous to lower printing temperatures by up to 5 -7 degrees C for some projects and some particular filament types in order to maintain print quality at higher speeds. The curling issue you mentioned is particularly noticeable when printing flexible material especially at sharp points . To solution I used was to increase barrel pressure to compensate for potential under eby Arnold Lane 1000 - General
Re: Flex Wheel Extruder - New type of Extrusion system for 3 D Printers - 5 years ago
Hi thanks for the question. The removal of all cavities and gaps (no matter how small) coupled with the ability to increase the driving force applied to the filament were the original inspiration for the design. The Flex Wheel has a 60 mm diameter (approx) drive wheel which has 2 x pre shaped flanges that envelope the print filament, these flanges are compressed against the filament by seriesby Arnold Lane 1000 - For Sale
Flex Wheel Extruder - New type of Extrusion system for 3 D Printers - 5 years ago
Hi every one we have just released the first run of commercially available Flex Wheel Extruders. Now available from our website - Flex Wheel Extruder The Flex Wheel is a revolutionary new way to grip, control and print with rigid or even the trickiest of flexible filaments with your exiting 3D printer. - Designed to be compatible with your existing 3D printer hardware and software. - 1.75 orby Arnold Lane 1000 - For Sale
Re: Dual hobbed extruder - 5 years ago
I found that multiple contact points between the drive system and the filament to be distinct advantage and also started using two hob gears in line, then thought if 2 is better what about 3 or even 4, but that's when it really starts becoming impractical. So I designed a larger single drive wheel with soft flexible flanges that envelope the filament ever so gently. As far as pulling power itby Arnold Lane 1000 - General
Re: Calulate Pressure of extruder based on force - 5 years ago
Comprehensive answer and sort of what I am after, thanks SupraGuy One of the small issues we are having with 3D printing is that of part density - understandably there will always be small air gaps in printed models (normally not an problem and probably be an advantage as it would make parts marginally lighter and use marginally less material with no discernible loss of strength) However I wasby Arnold Lane 1000 - General
Calulate Pressure of extruder based on force - 5 years ago
Is it easy to calculate the pressure that can be generated by the cold end of an extrusion system which is then available for the hotend? I refer to this simple article https://www.dummies.com/education/science/physics/how-to-calculate-force-based-on-pressure/ Which states : Pressure = Force/Area Can you then work out - Pressure = What your extrusion system can lift (say 4 kg's before failinby Arnold Lane 1000 - General
Re: Looking for others to road test new extrusion system - 6 years ago
Hi and thanks for the feed back. The extrusion system is a spin off from a larger project that we have been working on which involved printing a TPE with a shore hardness of 70A through a Bowden cable at +80 mm / sec with 100% part density, i.e. the there was no tolerance for under extrusion - the volume that was meant to be extruded - had to be extruded. As per Trakyan (I will reply in reverseby Arnold Lane 1000 - General
Re: Looking for others to road test new extrusion system - 7 years ago
Just thought I would post a quick update, thanks to beta testers, we are edging closer to a release date. In order to desiminate more information about the extrusion system I have set up a website - www.flexwheelextruder.com Hope for more feed back / comments and another beta tester (Australian based, sorry to the OS requests).by Arnold Lane 1000 - General
Re: Looking for others to road test new extrusion system - 7 years ago
I have used many hot ends during testing and I have found the most critical factors is that you need PFTE tubing extending down towards and as close to the hot end as possible, preferably being one piece all the way back to the drive mechanism. If it is not a one piece system make sure there are no gaps along the feed path, for some hot ends I have used combinations of brass tubes slipping into Pby Arnold Lane 1000 - General
Re: Looking for others to road test new extrusion system - 7 years ago
Thanks for the feedback, the flex wheel will be available in 3 mm and 1.75 mm, in both Bowden cable and direct drive set ups. Here is link to the Flex wheel printing the ‘Flexible octopus’ in 1.75 mm through a Bowden cable with the item sliced and printed at 70 mm / sec. This filament has a shore hardness of 85A (not the pretend flex that is shore hardness 90+). Flex Printing 1.75mm 85A througby Arnold Lane 1000 - General
Re: Looking for others to road test new extrusion system - 7 years ago
I am a little conscious of blatant self promotion on this forum - but -. Here is a link to a vid showing the system printing Ninja Flex through a Bowden cable. The part was sliced and printed at 80 mm / sec. and was printed for a customer who was very happy with the results. Flex wheel Bowden Cable mod Once I have road tested the extruder on other printers and it works I will be embarking on aby Arnold Lane 1000 - General
Looking for others to road test new extrusion system - 7 years ago
Hi There, I am in the final prototyping stage of a new extrusion system and looking for others to road test the system. It prints flexible filament twice as quick as the manufacturers recommendations and is a vast improvement on the existing pinch type roller extrusion system as used in all other FDM style machines. I am based in Sydney Australia and would prefer to start local. So if you areby Arnold Lane 1000 - General
Re: Heat Resistant TPU - 7 years ago
Hi dr Happy to send a small sample for you to test and evaluate (say 10 - 20 meters ??). Do you have a suitable extruder mechanism? It is flexible material (however it is easier to print with than say ninja flex of the same durometer) the filament has a diameter of approximately 2.85 mm (+ / - a bit as we are still playing with initial extrusion parameters and composition to tighten the specs)by Arnold Lane 1000 - Polymer Working Group
The softest filament FDM printed to date. - 7 years ago
Hi there, Just though I would share the results of another alpha test of a completely new type of extrusion system currently under development. While the extrusion mechanism eliminates the potential of print failures associated with printing flexible filament and substantially increases the speed at which filament can be printed we are also pushing the boundaries as to how soft a material you cby Arnold Lane 1000 - Polymer Working Group
Re: Heat Resistant TPU - 7 years ago
Sorry for delay in response to your questions, I have been busy with continued development. As far as preliminary test would indicate the material can easily withstand 140 degrees c for four + hours, I have placed a printed item in a conventional oven at this temp for four hours with no issues, item remains unchanged, however please understand this is still alpha testing. The shore hardness isby Arnold Lane 1000 - Polymer Working Group
Heat Resistant TPU - 7 years ago
Hi there, We are alpha testing a heat resistant thermoplastic polyurethane material that we are working on and I thought we would take this forum to share what what has been achieved to date. The base polymer is capable of withstanding 150 degrees c for 3000 + hours, however we would like to see whats capable with 3 d printed items. The following video displays a few tests conducted so far. Hby Arnold Lane 1000 - Polymer Working Group
Re: Use of a different stepper driver - 8 years ago
Thanks for that dentist, Just to confirm as I wire it all up. DIR out on RAMPS go to DIR + STEP out on RAMPS go to PUL + EN out on RAMPS go to ENA + I connect all '-' to a GND pin. There a 2 pins marked GND would it matter which one. Then I can use an external power for DC + and - Thanks in advance for any information. Arnieby Arnold Lane 1000 - General
Use of a different stepper driver - 8 years ago
Hi there Can I use this stepper driver instead of a pololu?? please see attached file. If so would it provide better performance? In regards to wiring up, the DC + and - and motor out puts I understand. Do I obtain input (PUL, DIR, ENA) from the RAMPS board, I think have located the corresponding output pins. I assume that they connect to the corresponding '+' inputs on the driver. Howeveby Arnold Lane 1000 - General