Wall plug (parametric)

by gnu, published

Wall plug (parametric) by gnu Jan 2, 2013
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Wall plug / screw anchor / dowel. Fastener for masonry walls. They come in many flavours, here is my favourite.


Basicly just input diameter and length before you print. You might get better results if you print many and/or use cooling while printing.

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Don't use with PLA! Found out the hard way

printed out and work very nice. especially that commercial plugs are always off a bit depending on wall type one drills (it's usuall tight fit so one cannot ram plug in in fine concrete, while way too loose in stuff like sandstone or brick)

also ability to customize inner hole is fantastic - actually one can use various types of bolts this way as this provides way more tolerance and options!

ad strenght - printed 5 and 6mm plugs in ABS and they outperform commercial plugs i could get in hw store out of box.
no way to pull the plug from the wall using force of my body :) and that's usually over 100N, and even more dynamically.

i would worry about ABS creep issues though - it might be that over time ABS will be 'pushed out' and the grip will weaken. ABS is not solid forever - it 'flows' like glass . perhaps more ABS/PC mixes should be used , PVC or something even more superior (i do not know really) . Given that i've seen commercial wall plugs made of ABS i guess this is not a showstopper though and such plugs will last at least several years without problems.

Awesome! Printable anchors! I think you should add some jagged edges to make them more like real anchors... I would but I use Rhino instead of openscad and it doesn't have parameterization capabilities that I know of.

A door had come off it's wall where the wood screws had torn out of the soft wood over time and left big holes they couldn't grip in to. I used your thingie to make the holes small again and now my door works again! Thanks!

Might gain some strength and durability if the whole bit is turned on it's side to print lengthways. (Due to how FDM printing works)

Spontaniously i would disagree, but I welcome anyone to make a strength test, and report the findings. The lengthwise forces are in the screw, not in the plug. In the plug the forces are radial. To prove my guesstimation wrong, simply use rotate([90,0,0]) in openscad to print laying plugs. You won't be able to print as many at a time though (due to how FDM printing works).

What a nice idea! Did you make some strength tests?