I'm working on a variant design for a MOC that includes a cover over an open area. The new design is based on a suggestion for a "cookie jar" style design made in another of my questions, LEGO Enclosure Clasp. However, I'm having difficulty identifying which bricks to use to properly implement the idea and need a bit of inspiration. Could someone point me to an example of a set or other MOC design that uses something like brick #2653 (the 1x4 "sliding" piece) in conjunction with a rubber band to generate friction against the side of another piece (if such exists)?

Here's a very rough diagram of what I'm thinking of. The rubber band (red) goes around the inner square and fits into the groove in part #2653 (yellow) but "sticks out" enough so that, unless force is applied to push them past the grey bricks, they should generally stay in place. example

My "problem" - and the reason I'm looking for guidance here - is two-fold. First, I have a relatively large (14x16) area around which I need this "gasket". Obviously, if the rubber band were to go around the entire thing, there would need to be some sort of reinforcement behind the grooved bricks to prevent the tension of the rubber band from just pulling them out of place. But, I'm thinking about using a few smaller sections (like one or two of the 1x4 end-to-end), each with their own rubber band. Perhaps a few of these around the perimeter would be sufficient?

The second is that I'm doing all of this virtually through a CAD system before I go looking into purchasing physical bricks and pieces I may or may not need. I've made several variants of the MOC with different ideas for how to implement the cover to refine my ideas as much as possible before I "pull the trigger", so I'd really like to see how someone else might have addressed this particular situation.

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    I for one, haven't seen anything like that in official LEGO sets. Were I to need something similar, I'd probably use pneumatic tubing (as it is thicker, longer and better compressible) or 2x1 Technic rubber axle connectors. The latter is typically used in LEGO sets to provide resistance against tension, compression or sliding while still offering some flexibility.
    – zovits
    Sep 12, 2019 at 16:24
  • @zovits - I could have sworn that I had seen it somewhere, but I guess that's why my Google-fu wasn't finding me any results. ;) Sep 12, 2019 at 20:57

1 Answer 1


I personally would steer clear of a "cookie jar" setup. The very suggestion of it's inherent qualities suggests something that wasn't meant to transport, but rather sit on a solid counter. The rubber bands aspect seems potentially problematic as well. Finding one that perfectly fits could prove difficult, and their elasticity would likely try to pinch in-between the tolerances of the bricks. A rubber O-ring, being thicker and firmer, would be better suited for this task. Personally I would opt for simple proven concepts that don't require guesswork and avoid potentially temperamental solutions. If you did manage to figure out a working snug fit, you then would need a big gaudy handle sticking out to remove it with.

That being said, I threw together an example of a proven method for a removable door. It would also incorporate your original idea of wanting a snap for peace of mind.

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It's just a very basic design to prove a concept, one that's easy to improve upon. One nice thing about this design is that you don't need a handle to open it, it un-clicks with just the friction of your fingers.

If you really want a cookie jar style lid I would incorporate a few studs onto a tiled edge, similar to how Modular sections are held together. I would suggest the lid have an inner lip to increase stability. Again, proven methods.

  • For some reason, I thought I had seen something utilizing the "cookie jar" method in a set somewhere, but my Google-fu wasn't getting me any results. I guess this is why. ;) I'll have a look at the sliding door concept as I think it might work better anyway. It doesn't require wasting as much vertical space for the interior of the storage area. Sep 12, 2019 at 17:46
  • Okay, I think I have this design mostly done (v2.1 - mecabricks.com/en/models/qxv4dZYYvdJ). I still have a couple of things to tidy up, but I think I like it a lot! There are a couple of things I'm still not sure about - I raised the landing area walls to make sure the exit from the tower was sufficiently covered, and I'm not sure if the small 1x2 plates above and below the ball catch will even actually fit IRL, but overall, I think it's a success. I just need to figure out which of these designs I actually want to build so I can start buying bricks! ;P Sep 12, 2019 at 19:20
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    @G_Hosa_Phat - Looks pretty slick! If you do go with this design, I think you'll find the sliding and clicking of the doors very satisfying. I couldn't stop fiddling with the little example I made sitting on my desk. :)
    – JohnnyB
    Sep 13, 2019 at 12:27
  • I love how simple it is. The "cool factor" of the swinging door design I originally had in mind (v1) was certainly fun, but I feel I was probably overthinking and over-designing everything. The only "drawback" (if you want to call it that) to this version is that it isn't entirely self-contained, but that's a small price to pay for good form and design. Now I just need to figure out final colors - which colors are available for and common to the pieces I've chosen so I can have a consistent look. Then it's off to the LEGO site or BrickLink/BrickOwl(?) to start ordering. ;) Sep 13, 2019 at 13:46

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