It is a holder that stretches the clothesline and keeps it taut. On the arret use a spring from the ballpoint. Use screws with a diameter of 3mm with a maximum length of 40mm for fix the cylinder. For the fix on the wall can to use screws with a diameter maximum of 5mm. The nut of cylinder for tightening is dimension to a 10mm wrench or is here the wrench to print.
I recommend use PETG.
Wall protectors are two version in length. 170 and 220 mm.
The author hasn't provided the model origin yet.