Eichhorn/Heros wood chain blocks

My son got a chain block construction set at christmas (e.g. [this](https://www.amazon.de/Eichhorn-Heros-100040002-Holz-Kettenbausteine-hochwertiges/dp/B00ID4DJBW/ref=sr_1_10?ie=UTF8&qid=1508872670&sr=8-10&keywords=heros+holzbausteine)) but there were a couple of models in the manual he couldn't build because there were not enough parts in the set.

So I measured all the parts, created 3D models and printed them. Now we have a massive kit to build whatever comes to our mind.

All parts fit t