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How can I print Lego bricks in order to make them attach?

I need them to be standalone pieces. I use resin to print. My model is Elegoo Mars 3. What resolution should I use?

Also, how should I color the bricks? I have some colored resin at home but I want to make them all black and color them afterward.

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You can't print a LEGOTM Brick, because you are not Lego System A/S. The best you can do is print a brick that is compatible with LEGOTM bricks. Also note that Lego Systems A/S has more than 600 US design patents, which might interfere with the legality of manufacturing bricks in the US.

The original bricks are made from ABS and made with a very tight tolerance and uses the inherent flexibility of the material to create a friction fit. However, Resin prints do lack the required mix of sturdyness and flexibility and thus can't create the required friction fit.

In other words: You can't make bricks that are compatible with LEGOTM bricks with a resin printer based on the material properties.

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  • $\begingroup$ Given that OP seems to want to use a coating for color already, could it work to do resin prints with additional clearance allowing for additional thickness from the coating to provide the needed flexibility and friction fit? $\endgroup$ Jun 13, 2021 at 5:53
  • $\begingroup$ @R..GitHubSTOPHELPINGICE no. the coating would just get destroyed over time. $\endgroup$
    – Trish
    Jun 13, 2021 at 7:50
  • $\begingroup$ The main patent on Legos has been expired since the 90’s, I remember when all these knockoffs were hitting the market. Also US patent law does not prohibit an individual from making a clone for their own personal use. $\endgroup$ Jun 14, 2021 at 6:26
  • $\begingroup$ Design patents are different. $\endgroup$
    – Trish
    Jun 14, 2021 at 10:01

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