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My BLV MGN cube build/upgrade saga (ongoing)

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My Duet controlled machine
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  • undefined
    JamesM
    last edited by 20 Aug 2020, 02:38

    Those small extrusion pieces you used to attach the bed will transfer heat quickly to the plastic mounts you have them in. Unless you are planning on keeping the bed temps down I would either add something to thermally insulate them from the bed or make those mounts out of something like Polymax Polymide CoPA which is rated to 140c without annealing and higher if you anneal it.

    I used railcore beds on both of my BLV printers and initially had extrusion mounted right to the tabs on the bed and they got real hot. I then just made a 3mm thick spacer from that CoPa filament between the extrusions and the bed and it helped tremendously.

    undefined 1 Reply Last reply 20 Aug 2020, 02:53 Reply Quote 1
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      whopping pochard @JamesM
      last edited by 20 Aug 2020, 02:53

      @JamesM Thanks for the tip! I've got some Nylon foam sheets in my McMaster shopping cart for just this purpose.

      I'm also rethinking the way I have the kinematic mount designed. The current layout is nice in that it allow minor misalignment of the rails without causing them to bind, but will transfer that misalignment to the bed as rotation around the primary constraint (left center). I'll be doing a bunch of testing once I get it back up and printing to see how much that ends up impacting the dimensions on the print.

      If it's bad, I will instead create a rigid extrusion 'T' and mount it directly to the Z carriages, and have my magnetic V blocks at the three ends of the T. The magballs will then be attached upside-down directly to the Railcore bed tabs. This also will have the advantage of limiting thermal conductance to the printed parts given the very small contact area. But it means I'd have to get out the dial indicators again... ðŸĪŠ

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        dhusolo
        last edited by 21 Aug 2020, 15:21

        Are you putting any updates on the Facebook page? I've had my triple Z with railcore bed done for about a year but I'm not gonna lie your setup has my quite intrigued

        undefined 1 Reply Last reply 21 Aug 2020, 15:52 Reply Quote 0
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          whopping pochard @dhusolo
          last edited by whopping pochard 21 Aug 2020, 15:52

          @dhusolo I'm not on Facebook, unfortunately -- definitely bums me out that the BLV community nexus seems to be there!

          I would love to see your build! Any links? Also, how has it worked out for you? Would love to know more! 😄

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            Veti
            last edited by 21 Aug 2020, 17:59

            ben is working on all metal parts for the blv.

            https://www.blvprojects.com/post/the-metal-parts-are-finally-here

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              JamesM
              last edited by 21 Aug 2020, 19:19

              I'm actually re-doing my bed mounts after seeing you using the extrusion pieces. It gave me an idea and I'll see how it works. Have to design and print a few things first 🙂

              undefined 1 Reply Last reply 21 Aug 2020, 19:25 Reply Quote 0
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                whopping pochard @JamesM
                last edited by 21 Aug 2020, 19:25

                @JamesM Sweet, I look forward to seeing the result!

                undefined 1 Reply Last reply 21 Aug 2020, 19:57 Reply Quote 0
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                  dhusolo @whopping pochard
                  last edited by 21 Aug 2020, 19:57

                  @whopping-pochard No links. I just swapped to a Duet 3 but I haven't published my parts. As far as the bed leveling has been once I got the offsets right it's been awesome. My biggest thing was bed stability so I redid my bed carriage. Now mine has 3x 331mm on Y (with one in the middle for extra stability and reduce possibility of twisting) and 2x 400mm on the X. With those dimensions the bed mounts are directly in the center of the 2020 channel so less printed parts needed to mount it.

                  It's not the current setup but it's my most current picture I have
                  Cube.jpg

                  undefined 1 Reply Last reply 21 Aug 2020, 20:29 Reply Quote 1
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                    whopping pochard @dhusolo
                    last edited by 21 Aug 2020, 20:29

                    @dhusolo Looks great!

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                      Veti
                      last edited by 23 Aug 2020, 02:42

                      If you are willing to beta test.

                      https://www.aliexpress.com/item/1005001323175853.html

                      undefined 1 Reply Last reply 23 Aug 2020, 07:48 Reply Quote 0
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                        MartinNYHC @Veti
                        last edited by 23 Aug 2020, 07:48

                        @Veti said in My BLV MGN cube build/upgrade saga (ongoing):

                        If you are willing to beta test.
                        https://www.aliexpress.com/item/1005001323175853.html

                        I just placed my order. Incredible price 🙂

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                          whopping pochard
                          last edited by 23 Aug 2020, 16:05

                          Wow, that is indeed amazing! I'm tempted to order one myself, even though I'm not sure how many components I could use from it at this point...

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                            dhusolo
                            last edited by 26 Aug 2020, 03:13

                            Word of warning those metal parts are still in the beta phase. It's entirely possible those parts might need revisions. Personally I won't upgrade to the metal parts until Ben and I work out the details of an official triple or even a quad Z axis with independent leveling.

                            undefined 1 Reply Last reply 26 Aug 2020, 04:35 Reply Quote 0
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                              Veti @dhusolo
                              last edited by 26 Aug 2020, 04:35

                              @dhusolo
                              i would really like to take part in the beta, but i am not on facebook (and i wont get an account)

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                                dhusolo
                                last edited by 26 Aug 2020, 15:27

                                You don't need to have Facebook for it and it's not really an "official" beta. The parts have been released to only one specific supplier on Aliexpress. Anyone can order them. There's no signup to get them. You just buy them

                                undefined 1 Reply Last reply 26 Aug 2020, 15:37 Reply Quote 0
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                                  Veti @dhusolo
                                  last edited by 26 Aug 2020, 15:37

                                  @dhusolo
                                  can you answer some questions?

                                  where do the endstops on the x carriage go now? the bottom seems to be different and no space to mount the endstop.

                                  are the mounting holes on the x carriage compatible with the hemera?

                                  does the original hotend cooling fan cover fit?
                                  does the original part cooling fan duct fit?

                                  undefined 1 Reply Last reply 26 Aug 2020, 15:44 Reply Quote 0
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                                    dhusolo @Veti
                                    last edited by 26 Aug 2020, 15:44

                                    @Veti I'm not entirely sure. I haven't seen any of the cad drawings to see how it's assembled. I won't purchase the metal parts until a suitable triple/quad independent Z axis is developed.

                                    However I was mistaken. You do need to be on the Facebook group to have access to the beta metal parts

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                                      I_Jedi @MartinNYHC
                                      last edited by 26 Aug 2020, 21:13

                                      I used blind joints with my Misumi extrusions and it was worth every penny! Misumi's cuts were spot on and when done, no angle was off my more than .3 degrees using my digital square. And SOLID as a rock to! Thanks to @Nuramori for the suggestion!

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                                        Veti
                                        last edited by 4 Sept 2020, 13:53

                                        the metal parts have now been released.

                                        https://www.blvprojects.com/post/new-metal-kit-upgrade-blv-mgn-cube

                                        not sure if i will get them as i like a direct extruder setup, and so far its only bowden

                                        undefined undefined undefined 3 Replies Last reply 4 Sept 2020, 14:20 Reply Quote 1
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                                          whopping pochard @Veti
                                          last edited by 4 Sept 2020, 14:20

                                          @Veti that looks pretty great!

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