This is to train your finger strength for climbing.
An alternative to expensive finger boards that require semi permanent installation.
Print two, one for right hand and one for left; full width is good for 4 finger drag. Space out along door frame at whatever width you'd like. There is a 0.2mm ‘bump’ that you can feel with your fingers if you'd like to hang on a 10mm edge. Full depth is about 18mm.
Print with anything but with plenty of top layers and perimeters for strength.
The author hasn't provided the model origin yet.