Parameteric hook-kindah thing you slide on plank.
by Jasper1984, published
The thickness of plank it is made for is 18.5mm, this has to fit the plank you're using. If your plank is a little thinner you can use (sufficiently high friction, like mask-) tape to make it clamp better.
If it is too far off you'll have to use the .scad file yourself.
Note that i made improvements on the designs after that photo.(also the print is poor because i was experimenting higher speeds and layer height)