Elegant handle for fridge magnets

Handle for ⌀10×3 mm magnets with hole/bore (e.g. these: https://www.clasohlson.com/no/Neodymmagnet-/p/31-1466). Optimized for 0.2 mm layer height, prints nicely without supports despite weird geometry, thanks to staggered layers. Might turn a bit messy underneath because of bridging, but this will not matter after the magnet is inserted.

The hole is internally threaded for M3 screw, I found it much easier to insert the screw than with a self-threading design.

Printing instructions:

• Print at 0.2 mm layer height. The model is designed with staggered layers for printing a hole in the middle of a bridging layer, these are 0.2 mm thick. In theory, integer quotients of 0.2 mm (like 0.1 or 0.05 mm) should also work, while non-integer quotients (like 0.07, 0.15 or 0.3 mm) might lead to weird results.
• 3 perimeters and 100% rectilinear infill for better rigidity and better bridging.
• Aligned seam gives the cleanest-looking result.
• Neither supports nor brim are required. Don't turn precious plastic into waste and save the planet. But consider printing on smooth sheet for better adhesion, even when doing PETG: the whole first layer is just two short perimeters.
• Print without enclosure or with enclosure doors open, maybe just use a draft shield: the bridging layers will benefit greatly from a bit of passive cooling.
• I printed in PETG, but PLA should in theory be up to the task as well, as long as UV resistance is not of concern: all the forces will be transferred quite evenly over the whole length of the screw, so brittleness of the material should not play any important role.
• Bonus pro tip: while it is not at all necessary for the functionality, you might turn off bed heating after first layer and also set bridges fan speed to 100% (the latter setting is available under “Expert" mode in PrusaSlicer). This makes the bridges look a tad nicer. Nobody will ever be able to notice it after the magnet is inserted. But you will know.

Leave a comment if you achieve better results with different settings!

Assembly instructions:

• Push the magnet into the pocket (the pocket is 3 mm deep, but thicker magnets should also do the job)
• Use an M3 screw with countersunk flat head (no longer than 10 mm) to fasten it.

If you find this model useful, please upload your makes and share your thoughts about design improvements!