Window blinds string strainer

The original window blinds string strainer was made of metal which started to rust in the bathroom, so I designed a new one. I printed it out of white ABS, and it's doing its job since months now without breaking.

I uploaded one straight model and one with teeth for better holding the string. If you print it with the screw side on the plate, you shouldn't need any supports with the toothless one, and I guess even with the one with teeth if your printer is well calibrated.

(Regarding the printed picture: unfortunately the window frame and also the string has some rust marks. It's not as ugly as it seems. :) )