Slug Trap
Description
Slugs will be out more when it's raining or has recently rained; the lid helps the water run off so the rain won't dilute the beer and make the trap ineffective.
You can also find a little bit more of a write-up with some info on a couple other printable garden accessories here: protoparadigm.com/2012/05/what-to-do-with-a-3d-printer-make-garden-tools/
Instructions
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Im using a slightly different design. I find yours is not deep enough, but it may depend the slug contamination:)
I dig a small hole in the soil, I cut off halfway an aluminium beer bottle, and put it into the hole, and cover it in a way, that it will be level with the rest of the soil.
I fill about one finger deep of beer. When I begin the slug hunting season the beer bottle almost fills with slugs. One box
may contain up to 40 slugs.
I may end up printing a holder for it, because when you "unplug" the box, the soil may fall in.
Best,
Laszlo
The solution may vary for different slug populations. Where I am, I mainly content with a legion of tiny slugs, varying form the size of a grain of rice to the size of a large multivitamin, with just a few larger ones on occasion. I will generally empty a trap this size once per day, or at least check it each day.
For larger slugs, I imagine you would want something bigger. Note that this design is also parametric (to some extent), so working from the scad file you could adjust its dimensions to suit your needs and printer ability.
I wonder if it would be effective using slug pellets? I suggest that as I have two cats in the house and I always worry about them trying to eat the pellets when they are scattered over the area. This would make it hard for them to get too I suppose...
Pellets also contamine the earth, and if you have eatable vegatbles in there, then I would not advise doing so.
Besides with pellets *YOU* need to collect the slugs, while with a trap you simply take the whole bunch and rinse somewhere in the garden. It is not disgusting, if I can say so.
Uhm.. I dont think PLA and ABS like alcohol? I mean, I think they disolve or something..
License
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I've printed several of these at 130% scale in PLA, which is just about the limit for the Replicator build volume. They work really well.