I used MakiYoshida's original design for the front left corner z rod. However, sometimes my z platform comes off from that corner when descending from a high z position. So I added a top layer to the arrestor to hold the platform down. The top layer is basically a copy of the bottom and just flipped over and combined. Both layers are about 5.57mm apart from each other. The thickness of the platform is approximately 5.4mm. I positioned this part laying on it's back in RepG 21 to avoid printing out any overhangs. It's a much easier installation on the front left z rod. I haven't tried the other z rods.