Hi @amedee and @catohagen,
great thanks for the replies and helpful discussion.
I am still waiting for some components and checking now the 24V upgrade. In regards to the fans I will put them in series anyway and should have another 12V (24V) fan lying around. Does the original 5V fan to be PWM-able or is it either on/off all the time on the UM2(+), once the printer is on?
One last question. My very hidden agenda is in the end (once I have an UM2 hot end and got used to it) to even try to upgrade my UMO to a Mark2. Next to the hotends (yes I would need another one) it seems to be the software/firmware that is the biggest problem here. Anyone of you has tried or thought about such a mod ?
Thanks again,
greengrecko
Hi,
I am trying to upgrade the UMO to an Mark 2 with 2 UM2 printheads. I have a friend which is very good in Arduino coding and he will translate the firmware so it will work with an Reprap Full Graphics LCD... If it works, we will publish it online!
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amedee
For the PT100 it is easy, you have all you need on the board temp pins, and no pull-up needed. See this picture: (Be careful, this is an old 1.5.3 board, on the 1.5.7 Sig and Gnd are swapped)
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amedee 349
For the small hot end fan, it is an on/off fan. On UM2 it is always on unless you have a recent 2.1.x board which powers off the fan when the hot end is cold. On the UMO 1.5.x it will be always on (I plan to add a small board to drive the hot end fan, but that won't be very soon as I don't have too much free time these days). So basically, just route either 12 or 24v to your fan and you will be good.
For the 24v mod, the regulator is the key part. The original linear regulator won't do the job (even at 19v on the old boards it can't power the controller, I actually made this mod before going to 24v!)
Mark2: I love this project... but I found that it is a relative expensive upgrade starting from an UMO, and I would rather consider buying a used UM2 for that. As you say, the main issue will be the firmware and I have no plan to mod the UMO firmware for that. @neotko is working on a UMO++Mark2 mod, but using another board/firmware for that (the Duet3d)...
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neotko 1,417
As @amedee says indeed it will need um2 board to use tinkergnome firmware and um2 oled screen to run it. On duet3d for now I'll do all semi manual since it allows to make and edit toolchange macros and more stuff like save z level offsets (normal um firmware doesn't have z offset for the tools).
Also if your objective is mark2 you won't need @meduza printed top but the real um2 top and a um2 slideblocks like the ones I made called beyond slideblocks that now have a final version called neotko-gudo slideblocks. This ones work on umo/um2 since they are modular and very compact, also they work with open belts and they have a tension system that gudo made. https://www.thingiverse.com/thing:2353849
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