Low force arm exerciser as suggested by the Physical Therapists at CureDuchenne.

thingiverse

These are components to build a low force arm exerciser as suggested by the Physical Therapists at CureDuchenne. The pulley comes in two versions one using two skate board wheel bearings with a spacer between and a second without bearings. Either will work fine. There is a ceiling mount designed to be held with two screws. The longer pin should be used with the ceiling mount. A paperclip can be used as a cotter pin through the center pin. The door mount slips over the top of the door without a need for mounting. The shorter pin should be used with the door mount. Printing the door mounted version without pulleys consumed 181 grams of plastic or around a $4 cost. At 50mm/s the print time is around 8 hours. I was able to print it at 80mm/s for a total print time of 6 hours. I designed the handles for an adult hand and printed them at 80% for my son. Please enlarge or shrink the handles for your use. I used paracord to connect the handles. Any similar sized string or even yarn could be used. The pulley could be used with anything up to 1/2" (12.5 mm) rope. The handles would need to be drilled out to use anything over 3/16th (5mm) diameter. My son has been using this and finds it to work well. Each arm counterbalances the other making this a low impact exercise. I printed everything in PLA.