For the GT2 mod, I posted a "BOM" here.
I personally recommend the "Twister blocks", but there are other options -- you need to keep the brass bushings.
While you are at it, do this mod as well.
Re. the lead screw, I always had very good result with my old UMO, not sure the new lead screw made a difference. The build plate is more stable and obviously the big win is the heated bed. The only thing you could argue is that the UMO lead screw is not metric, so some rounding needs to happen wrt the layer height...
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amedee 349
A couple of quick answers...
1) Yes, it is a pity, no HBK anymore. There is no difference between the UM2 and the UMO-HBK/UMO+ heated bed. If you try to retrofit an UM2 HB, you need to take care of the following:
- the lead screw is different, so you need to change the lead screw or buy the combo stepper/lead screw from UM as well.
- the temp sensor is a PT100, so you need an E3D amplifier
- it should operate in 24v (see (3))
- the wooden 'cover' is different, but you can print one (I think @neotko has printed covers)
2) GT2 from RobotDigg is a no brainer, there is a post on this forum with all the details on what you need to order
3) PSU: UMO is designed to run at 19v, but you can use a 24v PSU but you need to replace the original 12v linear converter on the board by a switching step-down regulator (search for 24v UMO on this forum). Going to 24v will make things easier in particular for the bed -- be careful with the hot-end fan if you are still using the original one, as it is a 12v fan over-powered in 19v and I don't think it will like 24v
Also check the version of the electronics (they range from 1.5.3 to 1.5.7), they all work equally good, but there are some small differences like the way the Arduino is powered, the electronics fan or the pinout of some connectors...
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JohnInOttawa 103
Thank you!
I will go for easy stuff first, GT2. It looks like that also involves replacing the blocks, I presume bushings as well.
Does the new lead screw improve resolution noticeably?
Excellent info on the electronics. I will look to see what standard the board is at.
Cheers!
John
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