Drawstring Slide Lock Clasp

Use this for waist bands or back packs or bags or whatevs. My Ruck sack in the army had a really nifty cord catch that was very convenient so I designed this part to reclaim that functionality.

PRINT SPECS
I used 0.1mm layer height with a 0.4mm nozzle and printed about 60mm/s and the quality was functional and acceptable.

Also, I tried scaling it up by 30% for a pair of boots and it worked great!

***This is my first ever design submission so please let me know if I am terrible at this and I will try very hard to fix. THANKS SO MUCH!!!

UPDATES
v3: reworked entirely - better design IMO
v2: units changed to mm for weirdo people less than a km tall
v1: units were in meters (sketchup doesn't like small things) [removed]