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Balloon Engine for Interlocking Toy Brick System

by chazwhiz Aug 21, 2018
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In my print, the LEGO base was not deep enough to mesh with the Lego brick studs. Can you extrude the base by 2mm more?

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I'd love to use this at school but am having a hard time printing it out. If I print with supports, the tube gets all clogged up and the bottom of the LEGO doesn't function correctly, and if I don't print with supports, the print has a very hard time getting started. Any tips?

Sounds like a matter of dialing in the bed adhesion. There's not a lot of material on the first few layers since it's just the lego-bottom part. I was printing with Makergeeks PLA and my bed heated to 45 degrees, but that will probably vary for different brands etc. Mine also has one of those stick-on print bed mats (it came with it) so that could be a factor. Some people use blue painter's tape or gluesticks to get good first layers, but I've never tried them.

Another option could be to use a brim or raft so there's more to grab onto for those first layers - It'll still be a pain to remove from the bottom, but won't affect the interior like supports do.

What is the clear plastic tube on the picture with the yellow balloon? That would be great to use for groups at school.

Are you thinking as like a mouth guard type thing? That's a good idea, I hadn't thought about it. Maybe some surgical tubing? You can get rolls up it for pretty cheap and then snip off short lengths for each kid.

Stuff like this https://www.amazon.com/Spearit-LATEX-TUBING-AMBER-10FT/dp/B01GXXZGZ6/ref=sr_1_3?ie=UTF8&qid=1540996478&sr=8-3&keywords=surgical%2Btubing&th=1&psc=1

That was actually just a little cap from an xacto knife I had nearby, I needed something to keep the air in the balloon long enough to take the picture :-)