The child has a set of IKEA wooden track trains, which many children have, but there are only three train cars, which are far from enough for him to play with. The IKEA train set, with three cars, costs 49 yuan, which is enough to buy a roll of consumable material. With this, dozens of trains can be printed, and the style is fixed. I guess it will be thrown aside after playing a few times. Therefore, I designed this train that is compatible with blocks, which allows him to freely use his imagination. I believe the child will definitely like it.

There is not a single screw. The only thing that needs to be prepared is two 3mmx6mm magnets. Everything else is snap-fit. Considering that magnets are easy to lose, I designed a hemisphere to put in the 3mmx6mm magnet. This ensures that it has enough magnetic force and when it encounters a magnet with the opposite polarity, it will automatically reverse. The magnets on the IKEA train are fixed, which means that two train cars can only be connected in one direction.

小朋友有一套宜家的木头轨道小火车，相信很多小朋友都有，但是只有3节小火车，远远不够他玩，宜家售卖的小火车3节49元，够买一卷耗材了，可以打印几十个小火车了，而且样式固定，估计玩几次就扔一边了，所以设计了这款兼容乐高积木块的小火车，可以让他自由发挥想象，相信小朋友一定会很喜欢的。

没有一棵螺丝，唯一需要准备的就是2颗3mmx6mm的磁铁，其他全部都是卡扣，考虑到磁铁容易丢失，所以设计了一个半球，放入3mmx6mm的磁铁，可以保证在足够磁力的同时，遇到相反磁铁极性时候，它会自动反转，而宜家火车的磁铁是固定的，这样就导致两节火车只能以一个方向连接。

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