LTT-like MCM keyhole fixture

My rendition of the LTT magnetic cable management power bar key, compatible with most of the standard keyholes I could find.

You can get the original at lttstore.com.

Designed for use with an M4x5mm heat-set insert and a 24×18×3mm neodymium ring magnet. You can use any M4 flathead screw that suits your setup. I found 14mm works great, with 10mm being about the minimum.

Assembly Instructions (see the photos for reference):

1. Glue the ring magnet into its designated slot.
2. Install the M4x5mm heat-set insert, be careful not to damage the threads.
3. Screw the two printed parts together as far as they’ll go.
4. Insert your screw of choice into the threaded insert through the hole in the triangle piece, leaving a bit of slack if needed.
5. Bob’s your uncle!

Now, just pop the screw head into the keyhole, unscrew the round part holding the triangle in place, and it’ll lock itself in.

BOM for reference 

• M4x14mm screw
• M4x5mm heat-set insert
• Neodymium ring magnet OD = 24mm, ID = 18mm, thickness = 3mm. This is somewhat compatible but thinner: https://www.magnetshop.com/neodymium-ring-magnet-50neg604505-ni.html 

Print settings for the best results: 

Print as-is with variable layer height set to minimum where the threads are (or set it to minimum throughout the whole print). Wall printing order shouldn’t matter much, but I used Inner/Outer/Inner. No supports needed, brim optional. Matte PLA works fine, I’ll update if I print in other materials. Parts should screw together with no resistance.

Caution: 

Magnets are fragile and can be dangerous if mishandled. Heat-set inserts can burn you. CA glue is also hazardous. Be careful, please.

Disclaimer: 

I’m not affiliated with LTT - just made this for myself and others who might not have access to the originals. Props to LTT and CW for the awesome ideas.