4 hours ago, adamjvr said:Its good to know that in order to convert it to 1.75mm all I will have to do is get that plastic part, I have found other sources for it that are cheaper.
Other sources that sell that part with a 2mm hole instead of 3mm? Are you sure? I didn't check but this is a pretty rare need so I'm surprised there would be another source. Probably 3dsolex sells 3 per year, lol.
You also need a feeder that can grip 1.75, the existing feeder doesn't get tight enough but bondtech sells feeders where you can switch between 2 different gear sizes for the 2 different filament sizes. It might not be public knowledge. But they will sell you just the gears or a feeder with the "wrong" gears.
But the printer is designed around 2.85 filament and works better that way (feeder torque/speed etc).
One more thing: the default black feeder on the UM2 is not great. I still have one on one of my 4 printers. The UM2+ has a much better feeder with twice the torque. If you do go 1.75 then the torque is fine but you need to get the gap where the filament passes to be tighter grip. There is a "meduza" feeder option combined with the iRoberti option that turns the UM2 (regular) feeder into a feeder as good or better than the UM2+. The iRoberti feeder is on thingiverse but unfortunately the meduza torque doubler was only on youmagine.com which is now gone. I have the files somewhere.
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gr5 2,265
Personally I think it would be worth the $95 or so to get the power supply. This is the most expensive part by far and maybe the only part that needs replacing.
The rod sticking out - there are pulleys with little screws in the pulleys to keep the pulley in place and this also keeps the rod from sliding out (the pulleys plus there are plastic cylinder spacers).
Clean the rods with wd40 or other cleaner. Get them nice and clean. You don't really want any oil on the center two rods that pass through the head as that just brings dust into the ball bearings. But the other 4 gantry rods should each have about 1 drop of oil after cleaned.
The tightness probably has more to do with being crooked. This usually happens when a pulley skips a tooth. Loosen at least 2 of the pulleys on the outer 4 rods, make gantry square, and re-tighten. You have to loosen one of these anyway to fix that rod that sticks out.
Going to 1.75mm filament? No. Don't do it. Please don't do it. Throw the printer away first. Yes you can do it. 3dsolex has a conversion teflon part and that's all you need on the hot end for 1.75 conversion: https://3dsolex.com/product/ptfe-coupler-um2/
If you have other printers - I strongly recommend you only buy 2.85mm filament for the UM2 and make the UM2 more specialized for just certain filament types/colors.
If you are going to buy a power supply for $90 and ship a teflon coupler for probably $30 shipping from Norway and a bondtech feeder, at this point I'd consider getting a new cheap printer. Maybe.
But once you get it working these printers are tough as hell and will outlast most other printers. The quality of the prints might not be what you are used to (I don't know what you are used to). I think most of the quality issues are from Cura not keeping up with latest features. But the UM2 is a great printer. I have 3 that I use regularly among my 5 most used printers.
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adamjvr 0
Thanks for your informative and thorough response I really appreciate you taking the time to share your knowledge and experience !! I've been into open source 3D printing/RepRap since about 2011, I currently have a Prusa i3 MK3S+, a Lulzbot Taz 6 (restored and converted to 1.75mm with E3D Hemera), and a Replicator 1 Clone (updgraded with Micro Swiss hotend kit and custom blower fan). I've always wanted an Ultimaker machine, and this Ultimaker 2 I just got gifted kind of rounds out my collection of the golden era open source 3D printers.
As for the change to 1.75mm and the bondtech style upgrade its not going to be that expensive for me. The extruder kit was 14 bucks on Amazon and will arrive tomorrow, the E3D V6 Hotend I just happen to have new unused on hand, so all I really need to do is order a new power supply, Amazon has them for 72 bucks and free shipping since I have prime.
It sounds like the main things I need to do are:
- clean the rods with WD40 and re-lub them
Edited by adamjvr- loosen the pulley set screws and slide them down so that the rods dont' stick out the side and tighten them
- square the gantry
I'm not 100% married to the idea of converting over to the E3D as the olsson block hotend is a very interesting and good design and Its good to know that in order to convert it to 1.75mm all I will have to do is get that plastic part, I have found other sources for it that are cheaper. I think I'll get it so I can try out both options. I'm really not interested in 3mm filament , its just not as common with the suppliers I currently use and I'd like all my printers to use the same format. I will be holding on to all the parts I swap around so I can revert the machine, but the good news is that the gantry can be squared and the rod problem fixed that was the main issue I was concerned with. I'm gonna do all that and make sure everything moves smoothly by hand then order up a power supply and let it rip.
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