• RE: Prusa is working again

    The cart we have is the plywood cart that floats between the hack room and the hallway. It isn’t ideal and requires moving the middle shelf and making the top bigger. Starting over might be a better idea.

    We did have plans to keep the computer and monitor on the cart as last minute design changes happen. Other ideas included a thermostatically controlled vent fan. Filtration probably isn’t needed as odour hasn’t been an issue. We expected the printer to smell way worse based on the online descriptions.

    Ultimately the design will be what the person who wants to put in the effort says it will be.

    posted in Tools and Space
  • What's wrong with the planer?

    Hey all,
    Does anybody know what’s wrong with the planer? I went to go use and it and saw the message “Danger. Do not use.” written across it.

    Thanks!
    Lucas

    ![0_1532190887413_IMG_20180715_155601.jpg](Uploading 100%)

    posted in Tools and Space
  • RE: Prusa is working again

    @Torren we used mineral spirits last time. The can should be in the paint cabinet.i would put a shop cloth on the plate, soak it with mineral spirits, and cover it with a pane of glass to keep it from evaporating.

    posted in Tools and Space
  • RE: Prusa is working again

    @JasonH sorry if I angered you by sanding the print bed. Just following whatever instructions I can find on the internet. Perhaps we can repair the sanding by polishing it with steel wool or 2000 grit sandpaper.
    We have discussed making an enclosure. There is a wooden cart set aside for that project if anyone wants to take it on.

    posted in Tools and Space
  • RE: WE SHOULD REPLACE THE LASER CHILLER

    Hunter’s fix is good enough to last until the window rattler breaks down I think. Which is likely several years from now at the rate we run it.

    I hope to build another, better chiller, and have a spare ready to go well before then. We could knock one together with not much more than $60 in parts… but we usually recycle donated parts for them.

    Ideally, I’d use a mini-split rather than a window-mount… That would let us just strip the cold-side and plunk it in the water bath. We could even mount the hot-side outside the building on a wall, if the hot-side was big enough, we could even strategically air-condition a few of the upstairs rooms.

    posted in General Discussion
  • RE: Prusa is working again

    @Grant-Fraser and I replaced the PEI last time we ordered stuff from prusa… Because it seemed like a cheap fix. It took many, many hours to clean off the old glue to get the new PEI to sit flat.

    Next time I have 200 bucks I want to burn, I plan to order this: https://shop.prusa3d.com/en/printer-upgrades/179-original-prusa-i3-mk2s-to-mk25-upgrade-kit.html

    That’ll give us a MK3 style steel bed with a magnet mount.

    posted in Tools and Space
  • RE: WE SHOULD REPLACE THE LASER CHILLER

    A fairly common situation is doing a raster scan… Where the laser cuts continuously , almost without pause for tens of hours.

    Relying on the water as a thermal battery, and expecting a peltier unit that is an order of magnitude to small to make up the shortfall during the down-time is much riskier than I’m comfortable with when it comes time to replace laser tubes.

    Incidentally @HunterVogel did a great job on the chiller repair.

    posted in General Discussion
  • RE: WE SHOULD REPLACE THE LASER CHILLER

    From an earlier post “1040 watts go into the tube. 119 comes out as a laser. 921 is removed as heat by the chiller.”

    Unless we have a 1000 watt Peltier cooler we won’t be able to keep up with the heat generated.

    Here is a good explanation of why an AC is a better idea. First page is relevant. Next three are a flame war. Somebody made FTL data cables?

    https://www.electronicspoint.com/threads/cheap-peltier-air-conditioner.130381/

    posted in General Discussion
  • RE: Techfest 2018

    SubCulture will give us a table if we want it, I’m bringing some lights and stuff by the office so they can see what sort of insanity we do…

    I could probably get a spot for the bus if @Nicholas wants to come. There will be some food trucks, and … it is a 13 acre facility, so there will likely be some room.

    posted in General Discussion
  • RE: WE SHOULD REPLACE THE LASER CHILLER

    My best recollection is that we might have put down spray foam first, then siliconed that on the first one?

    posted in General Discussion