Magnerds
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Veröffentlicht:2025-12-27 20:20:58
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NOTE: This solution is intended to be used with one or more manufactured products.
A Magnerd is a rubber band with a magnet attached. Printing requires flexible filament.
Taking measurements then trying to match the numbers in Customizer will probably yield unexpected results because the values are relative rather than absolute.
Tree-like supports (as provided in Meshmixer, Ultimaker Cura and Flashprint) work with the filaments suggested and can be used for the retainer ring aperture. I wouldn't recommend adding them to the inside of the barrel at any barrel size because they can be quite difficult to remove from inner surfaces. Don't expect supports to work if you try to print using a spongy filament.
My recommendation for a powerful but small magnet to use for Magnerds is Michaels PROmag Neodymium.
There are a couple of presets in the included .JSON file that don't seem to be usable by the Thingiverse Customizer. The values of these presets are included below. Belt diameter can be set independently of presets so its value is the same for both. You may want to download both the .SCAD file and the .JSON file so you can access these features in your own installation of the latest Openscad.
An example .STL file is included that was created in Openscad using the .SCAD file's default settings which are suitable for the PROmag Neodymium magnet.
The first preset (PROmag Neodymium) is the same as the default setting. That magnet is 6.3mm (.25 inches) X 3.04mm. I also have a some larger neodymium magnets (13mm X 2.5mm) for which the 2nd preset works well. I have no affiliation with any seller or maker of magnets.
Below are the two presets.
ProMAG Neodymium:
"APERTURE": "yes",
"APERTURE_DIAMETER": "0.63",
"BAR": "no",
"BARREL_DEPTH": "4.6",
"BARREL_OUTER_DIAMETER": "3.8",
"BELT_DIAMETER": "4.4"
13mm X 2.5mm:
"APERTURE": "yes",
"APERTURE_DIAMETER": "0.68",
"BAR": "no",
"BARREL_DEPTH": "4.8",
"BARREL_OUTER_DIAMETER": "7.7",
"BELT_DIAMETER": "4.4"
Print Settings
Printer Brand:
FlashForge
Printer:
Creator Pro
Rafts:
No
Supports:
No
Resolution:
.1-.15mm
Infill:
100%
Filament: Ninjatek Cheetah, Sainsmart TPU, or similar I suggest a flex material with shore hardness 95A Any Color (mine is black)
Notes:
Cheetah and SainSmart TPU are both rated at 95A, however, I find that Cheetah seems to have a bit more elasticity. I've had success with other elastic filaments such as Ninjaflex, but I'm not sure it's possible to make more elastic material hold the magnet in place without glue. The 95A filaments are compatible with tree-like supports, which may be needed for larger barrel settings.
If the magnet won't stay in the barrel, try shrinking the aperture of the retainer ring and/or the barrel itself before attempting to print again. If you need more powerful magnetic attraction, you can expose more of the surface of the magnet by turning off both retainer ring and barrel and using a little all-purpose glue.
Caution!
Flexible material normally requires high temperatures and slow speeds.
Most of my Magnerds have been printed with Ninjatek Cheetah at 240°C. Also, especially if you aren't used to printing with flexible filament, these should be printed slowly. Half the speed of medium resolution PLA or slower yields the best results for me. These are small, though, and shouldn't take long to print even at slow speeds.
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