Neuromuscular impairment requires adherence to a rehabilitation regimen for maximum recovery of motor function. Consumer-grade game controllers have emerged as a viable means to relay supervised physical therapy to patients' homes, thereby increasing their accessibility to healthcare. These controllers allow patients to perform exercise frequently and improve their rehabilitation outcomes. However, the non-universal design of game controllers targets healthy people and does not always accommodate people with disability. Consequently, many patients experience considerable difficulty assuming certain hand postures and performing the prescribed exercise correctly. Here, we explore the feasibility of improving rehabilitation outcomes through a 3D printing approach that enhances off-the-shelf game controllers in home therapy. Specifically, a custom attachment was 3D printed for a commercial haptic device that mediates fine motor rehabilitation. In an experimental study, 25 healthy subjects performed a navigation task, with the retrofit attachment and without it, while simulating disability of the upper limb. When using the attachment, subjects extended their wrist range of motion, yet maintained their level of compensation. The subjects also showed higher motivation to repeat the exercise with the enhanced device. The results bring forward evidence for the potential of this approach in transforming game controllers toward targeted interventions in home therapy.Neurological disorders often lead to profound disability that is associated with a loss of mobility and independence, adversely impacting all facets of life 1,2 . It is estimated that more than 11 million Americans require assistance to perform activities of daily living, costing at least $170 billion every year 3 . Approximately half of these costs are indirect, stemming from unemployment and loss of productivity 3 . Individuals with neuromuscular disability can be successfully reintegrated into society by adhering to a rehabilitation regimen consisting of repetitive, high-intensity exercises 4-6 . Nonetheless, the vast majority of patients do not receive treatment with sufficient frequency to achieve this goal. The process of leaving their homes and traveling is often exceedingly incommodious, impeding them from arriving at a clinic 7-9 . Moreover, the rising costs of treatments, understaffing of medical specialists, and long waiting periods prevent them access to out-patient care. Therefore, patients' recovery usually depends on the performance of exercise at home, with limited professional feedback 5 .Telerehabilitation offers an effective means for the administration of affordable and convenient physical therapy to patients' homes. In telerehabilitation, actuation and sensing technologies are utilized to relay physical therapy while providing medical specialists with objective performance scores to remotely gauge the progress of recovery. Telerehabilitation is advantageous for several reasons. First, it eliminates the imposition associated with traveling 7,...