Selflocking Bondage Mittens by joe-the-wulf

Last crawled date: 3 years, 1 month ago

This mittens are self-locking, so no additional locks are required. The inside shape is based on a 3D-scan from a hand, so they are relatively comfortable, also for long time use. The spheroid shaped outside is completely smooth, no hooks, no locks, no nothing, so no way to use the locked-in hand for anything.
To use the mittens simply slide your hand into part A, place it over part B and insert both hooks into part B with a little rotating move. The middle of the wrist opening is the center of rotation. Take care that you don't get your skin caught between the parts while locking. Carefully press part A into B until the are locked. That's all, see pictures.
As key can be used any bolt, diameter up to 8mm and 55mm minimum length (when mitten not scaled). Maybe a (backup) key should be fixed installed somewhere, in a secure place.
For an emergency release simply remove the screw which hold the hook inside.
Sizing:
The mittens are sized for a 9cm wide hand, measured over the 4 fingers like for glove sizes too.
If the hand is to small it can pulled out, so scaling will be necessary.
I've added a 2D scan of my hand to the Thing Files (reference_hand_size.pdf), maybe it's helpful for scaling.
Please make a test print of the SizeCheck file first, to ensure you can't pull the hand out. You'll need 2 nuts M6 and 2 hexagon socket screws M6x20 for the not scaled version.
Scaling:
When you need to scale do it with 3D software, if possible. So you can see all parts in the original position to prevent mistakes, while slicing software lay every part to the building plate (in this case the Hook). You should be able to scale every axis with different values, if necessary. The Hook can be rotated at the end (or in slicer) by 58 degrees around the Y axis to print it without support is needed.
If you need to scale with Cura take care of the orientation of the parts, because it seams cura makes some optimizations during loading a file. Use can fix this under Edit by Reset All Modell Positions / Transformations.
Please consider to print SizeCheck again.
The constructed mitten is the right one, please use the mirror function in your slicer software for the left one.
Installing the Hook:
Because the need of scaling I can't use a M4 screw and nut in this Hook file, so it has a 2mm hole which can be drilled up to the diameter your self-tapping screw needs.
Printing:
Take care of your support settings, otherwise it can be difficult to remove in some areas or unstable if it's high and freestanding.
I've sliced mittens with 1.6mm wall and 15% infill, triangle pattern with Cura. Part A with tree support, Part B with normal support.
Slow down printing speed for the first 6mm and for part A when the two hooks starts to be printed on the support until the are connected to the main part.
The Hook I've printed with 100% infill.
The mitten parts are ~300g each, needs ~18h to print each, with 0.2 layer height. That's one reason, I've used a spheroid shape, not a sphere.
DISCLAIMER:
Use it at your own risk and not when you're alone!
Have fun and stay safe!