quick-adjust mason's cord anchor

thingiverse

Anchor to secure your mason's cord / mason's line without using nails, screws or knots on 90 degree corners. The flex of the cord holds the anchor in place. The anchor can be easily moved sideways and allows you to change the length of your line on-the-fly. If you experience the anchors slipping off the corners, your print material has too low friction and / or your printer produces nice, smooth surfaces (good for you!). In that case, either stick some high-friction material like rubber onto the inside faces of the anchor or just rough up the surfaces a little with a file / knife/ rough sandpaper.