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[T] Roller cleaning, motor drivers and air filtration

A project log for Liquid Laminate Lithography 3D Printer [gd0105]

The best of resin with the best of filament; is such a 3D printer possible?

kelvinakelvinA 07/23/2022 at 14:110 Comments

Roller Cleaning

I just had an idea to clean the rollers, and that is by using a thread/rope/yarn across the entire length of it. Before this, I was thinking of paper kitchen towels and wondering where I was going to fit it. Additionally, there was not really anywhere for the used paper to go and I was worried it'll be draping over the front/rear "windows". This initial idea came from an article I mentioned in a previous research log.

Now the idea is to have the rope travel in a (ptfe coated) channel, with a similar tensioning system to the main one used for the PET film. Hopefully it can be simplified to only need 1 motor to pull and keep tension of the yarn, since it only goes in 1 direction (towards the waste spool). The yarn will be incrementally dragged across the length of the roller and there will be UV lights that slowly cure the resin so that it grows similar to the article mentioned in the above paragraph. The post-exposed/pre-cured layer shouldn't accumulate much uncured resin so that the roller doesn't accumulate much uncured resin, allowing the yarn to collect it all.

Driving motors

I've already counted the motors I'm using so far and the Suspense is likely to need over 10 independently controllable drivers even before the ones for the roller cleaning. I plan for a relay to switch which arm motors are connected to the driver since the printer can't use both at the same time. The BTT GTR can only accomodate 14 at the max, so Klipper and a M8P + [insert 8 extruder board) like the #SecSavr Sublime [gd0036] is probably required. I'd like to model in mounting holes that are compatible with the Monster8 (cheapest), Octopus (cheapest from BTT) and M8P to give users the option to install a wider choice. 

I'm not sure if those smaller but way cheaper stepper motors can use 24V. I know from a YT video that they can use 12, so those steppers may need to be on the main Manta M8P with CB1 (I just got the latter in the mail today) and run them on a different-than-input voltage. 

Air Filtration

Speaking of the electronics, I'm thinking of putting them under the VOC filter system which is at the bottom of the printer under the bed since there's still enough space at max Z to house a plane under there /s. I'm thinking of using the filtered air to cool the electronics before they go back outside. The intention is to have a negative air pressure and have a filter powerful enough to not rely on the use of venting through a pipe out to the nearest window. If anything, I want it to be so purifying that it can lowkey be used as an air purifier for the room the printer is in. I mean, I've got to prevent dust from getting into the printer and then prevent any VOCs from exiting it, so it's probably going to do it anyway.

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