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Posts posted by JohnInOttawa

  1. I thought I might float this topic, as there are just too many times now when I find myself asking why the original UM2Go was discontinued.  Right now, with so many students displaced, the demand for something capable and portable just seems to be skyrocketing and this little printer would be perfect.


    But, since it HAS been discontinued, I thought, Hm.  Could the UM2Go be reintroduced with the same size, but with a heated glass bed and dual extruders so it could print dissolvable or breakaway supports?  (I don't know if this would need print cores, likely that would be the fastest route to implement).  I know this would add a lot of cost, but for students, it's the size and right now, they are saving a bundle on residence fees so.....


    Would anyone else use a UM2Go+ if it were offered?

  2. Since Cura allows for line width adjustment, it's really just a matter of specifying the correct line width for line height, temp and maybe tweaking flow rate.  For PLA I can print with a 0.55 line at the temperatures I am using, for Nylon and some of the hotter printing filaments I find I need to increase the line width to avoid overextrusion. 


    It would be better if Cura allowed user specified nozzle diameters, but for now we have to work around Cura.



  3. I have a UM3 that I converted to permit abrasive filaments.  Feeders went to Bondtec DDG (via gr5 store) and I added 3d Solex Hardcore (also from George) with a set of hardened and ruby/sapphire nozzles.  I've printed a fair bit of abrasive stuff since without issue, currently using Nylforce CF and Murano, have run Copperfil in the past without issues (except for some clogging at .25 nozzle, but that was on me).


    The bondtec feeders work pretty well, the firmware needs a tweak after each change, as they don't use the same steps/mm as standard.


    WRT the 3dSolex printcores,  changing nozzles has to be done EXTREMELY carefully to avoid shearing the heat break.  There is some optional programming (check out gr5's related posts on this) that will reprogram the hardcore to look like an AA 0.4 to the printer, which saves having to override it each print.  I run a hardcore 0.6 with some of the higher particulate filament to prevent clogging and it's been great.


    Good luck!


  4. This would certainly be a great option for those who occasionally need to print metal but can't afford $100K to jump in. 

    A couple of questions:

    1) I see the spool is sold by weight, not volume or length.  I would think 3kg of stainless steel is a lot less filament than 2 kg of PLA.  Is there a measurement in terms of m^3 or length (2.85mm) per spool?

    2) Does this material need special storage/drying before use?

    3) I am just setting up for the XStrand learning curve, the 316L is more than 4 times the price, so would appreciate knowing how to dial settings in sooner rather than later.


    Thanks to the pioneers!


  5. Good morning everyone!  This has probably been asked and answered many times, but my search so far has not found it.


    I see a number of calibration prints when the temperature varies with height - clearly this really accelerates dialing in the correct temperature for a filament and nozzle combination.


    I cannot see how to accomplish a variable temperature print on the UM3 using Cura.  Is this possible?  If so, how?  Is it done within Cura settings, or does it require G-code editing afterwards?




  6. With all of the printing of PPE these days,  the workflow feeding the UM3 has allowed some time to get some other projects done.  Along the way I have been trying filaments that I had long wanted to use but didn't want to unpackage until needed.  I've run some Nylforce CF (nice stuff but takes tweaking for dimensions), Murano (super strong, dimensions also need tweaking),  Cheetah (which has really hit a few bullseyes) and now, Taulman 910.


    I must admit that I have not mastered Nylon, at all.  I've looked at all the material I can including gr5's excellent tutorial.   I have some Ultimaker black Nylon which I can get OK (as in only slightly warped) but reasonable surface and dimensions out of.  Today I tried some Taulman 910, as I wanted to see how it did in terms of warping and strength.


    Warping seems decidedly less than the Ultimaker nylon, but for my project (a hinge with a vertical barrel and horizontal mounting plate, so circular holes  on two planes normal to each other), it has been a challenge, with each tweak seeming to trade off print quality, dimensional accuracy and strength.


    The primary dimension that I really can't mess up is the barrel, as this rotates on a hinge post.  My preference, then, was to print this with the barrel and mounting plate vertical, without supports for the two small holes through the plate.  Whereas I could get away with this using the Ultimaker nylon, the Taulman prints less evenly, resulting in a wavy vertical edge and warping along the narrow contact with the build plate, even with extensive brim. 


    Lying the mounting plate flat yields excellent results on the mounting plate, better than I saw when printing with Ultimaker nylon and no warping at all.  Unfortunately, the barrel suffers.  Using the 910 as support material to protect roundness results in a bonded block of nylon support that can't be removed, so I am trying the print now with PVA support.  We'll see.


    Right now, print settings are up to 260 for the nozzle, 70 for the build plate, 40 mm/s for the speed.  PVA coating on the print bed.  I've be grateful to hear the experience of others running 910 and learn what has worked best for you.


    All the best, stay healthy!



  7. This is related to a cross post in tips an tricks.  I have a TPU print that seems to have excessive travels across a feature, each one creating a string and roughness along the inner wall.  Is there any technique, setting, plug in or other suggestion to force the travel moves to take place within the boundaries of the walls?  I know this would greatly slow down the print, even if it were possible.  Time is not a factor but print quality is.


  8. I am printing the pictured item in TPU (Cheetah).  While I really like this material, it is prone to stringing and retraction is not really a great idea as it is prone to stretching in the bowden tube when I do that. 


    You can see the travel moves, each one of them is resulting in a string and associated rough spot on the face at either end.  I'd appreciate your thoughts on ways to reduce the problem, particularly the intense travel activity across the top part.


    Thanks in advance!





  9. Good afternoon everyone.  I hope this finds you and yours well.


    Like many here, I'm pushing my printers to supply the front line.  Watching my better half don her scrubs and head into the clinic is a powerful motivator.


    Speed is important but so is accuracy, so I am looking at ways to improve.


    There are many mods that aim at reducing the translation of shaking from rapid moves into the table or as noise.  Looking at my CNC bed, the solution there was the opposite.  Go as heavy as possible on the supports and immobilize the base. It was even suggested that we fill the aluminum extrusions with concrete or sand to add weight and inertia.


    So back to my UM3.  I am thinking the box is pretty rigid, but perhaps it could be more so.   I'd like to hear your thoughts on the base and ways to mitigate vibration and shaking.


    Thanks and stay healthy!

    John in Ottawa.

    • Like 1

  10. Bump!  I have a UM3 and am just finishing a spool of ultimaker PLA, would like to reuse this roll for another brand, the main reason is that the other brand spool is incompatible with the rear holder.


    That means, I think, that I have to reset the material amount.  I don't know what hardware I need to write to this NFC tag or whether a UM3 can do that.  I have to think it can as it updates the material amount?


    Thanks John


  11. Good afternoon everyone.  I have a rather pressing question.


    I am printing visor holders - over 3 hours with a 0.4 nozzle, but I have a 0.6 (hardcore) available.  The problem I face is that Cura 3.4.1 cannot recognise the 0.6.  I believe 4.5 does.


    I have been following the stability issues with firmware and Cura.  I can't afford to brick my printer at the moment.  I would like to know if there is a way to recognise or otherwise use a 0.6 in Cura 3.4.1 or, alternatively, install 4.5 in a way that does not screw up my 3.4.1 install.  I also don't know what firmware level 4.5 requires.


    I have been printing with my 0.6 successfully with other materials, but I am concerned that, as this print has a narrow slot for holding a plastic visor sheet, that the 0.6 nozzle may lay down too wide a line and so make that slot gap too small.


    Thanks for your help.



  12. Good morning everyone.  I'm looking for advice.


    After a successful test print of a visor 'hoop' (remix of the Prusa RC2 which was the pick of the doc near me) in PLA, I need to print a number of these in a material that can withstand a bleach solution or alcohol spray.  For some reason all of the print recommendations reference PETG.


    I have some nylon on hand, three rolls of T-glase and of course lots of PLA.  I will stay away from the PLA, just because it's not recommended by anyone, but don't want to waste the filaments I have experimenting and have never used the t-glase (the rolls had just arrived in December).


    So, I would dearly love input from those who have successfully used T-glase on a UM3.  What print settings work, how should I prep the bed and at what temp should I run it.  I do have some Ultimaker print adhesion sheets, it looks like these have been recommended elsewhere as a way to prevent glass bed chipping.  Open to thoughts.


    My wife's clinic is already running low on visors so the sooner I can print these up the better.  Thanks!!



  13. 2 hours ago, SandervG said:


    I think which material will be necessary will depend on which application a specific hospital needs. When we have a request we can see which hub can help best. Logging all this in advance was too complicated to do clearly on such a short timeframe, with the amount of differences that exist. 

    Completely agree.  More a question on how we might verify a supply of what is needed before we take on a product request.  I appreciate this is coming together quickly and we'll fill in the blanks as we go. 


    What's the normal time frame from signing up to appearing on the map?  You are probably already dealing with a backlog, at least I hope so! 😉


    Good on you


  14. On a related note, there are probably a number of ultimakers out there potentially sitting idle for one reason or another.  Is there a way to put out a public call to check for eligible printers and perhaps connect with the nearest active hub that can put the printer to work? 


    I know there are many complexities with doing so, not the least of which is social distancing requirements, but given that these printers wipe down pretty well and we already use isopropyl on the print beds, this might be a way to multiply the number of printers we can bring to bear.


    One further thought - some of the business where there are bound to be many of these printers, are shut down.   If there is an essential service that these printers can provide, perhaps limited access to employees, again, respecting social distancing, can be granted to permit the printers to function.



  15. I've tried to fill out the form as best I can.  As for materials, I guess it will depend on the need.  I have lots of PLA but limited nylon, a fair bit of PETG.  Maybe we can put together a chart of what materials are best and safe for what medical applications, any other info like tendency to promote static electricity or things that might interfere with medical devices would be good to know too.


    Here we go!


  16. Ditto here in Ottawa.  Form is flagged.


    Happy to help!


    I can't see the form so this next question might be answered, but if we can be connected to sources of filament that are remaining open and known to work with the parts we need to make, that would be excellent....


    Great initiative. 

    Best wishes to all and your loved ones. 


    • Thanks 1

  17. I don't have an S5 but have looked at this off and on since its release. 


    Not to be too picky here, but how did we get to the point where one needs a distributor to correct a firmware update?  I don't live anywhere near a distributor.  This would be a big deal.


    I get the hazard warning with stored charges and the advice to avoid exposure is wise.  But the philosophy behind such a creation, coming from Ultimaker of all places, surprises me.


    Now, this place is full of people waaay smarter than me.  Is there any possibility down the road of creating an interface unit that can allow a field recovery without risk of death?  I mean, seriously, what will we do when the S5 is no longer supported by distributors?



    • Thanks 1
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