Logitech Momo Force Main shaft with added strength

thingiverse

Firstly, I'd like to extend my gratitude to those two sources who made this minor mod possible. Without their work, I wouldn't have been able to achieve this fix. It's intriguing that several users have reported issues with the Momo Force main shaft failing at the same spot, where torque is transmitted from the force feedback motor to the steering wheel rim. The spacer by ock10 addresses this issue effectively. This mod is a combination of two sources. The original Momo Force main shaft tends to break consistently in the same area due to excessive stress. The spacer added by ock10 fortifies this weak point, ensuring the shaft can withstand the torque without failing prematurely. A friend of mine, Trevor McCormack, created the attached file by integrating the spacer into the main shaft designed by StoraBrollan. He also included minor support for the pot area to prevent warping or sagging during printing. This part can be easily cut out using a side cutter or dremel. The added spacer makes it slightly more challenging to route the wires for the front buttons through the shaft, but this is not a significant issue. However, the longer bolts required for connecting to the rear metal plate holding the main gear in place may pose some difficulties. I solved this by using allan caps and sinking them about 1mm into the shaft body. The calibration part from StoraBrollan is also included to ensure a proper fit of the resultant part. Depending on your print settings, you might need to adjust the scale slightly to avoid wasting filament. The entire print takes approximately 10 hours and requires about 20m of 1.75mm filament. IGS, STL, and STP files are provided for your convenience. While disassembling the wheel, be sure to check the main motor screws as they tend to work loose over time. Apply some loctite to keep them secure. Additionally, inspect the rubber stop, which may break apart with age. Use two large tap washers glued together and make minor modifications using a stanley knife and drill. Print Settings: Printer Brand: RepRap Printer: prusa i3 Rafts: No Supports: No Resolution: 0.2 Infill: 70% Notes: Printed in ABS, bed at 95 degrees, no cooling. Post-Printing requirements: Normal basic cleanup will be required afterwards, but since the part is not visible, finish is not crucial. I had to perform minor cleanup of the holes to ensure smooth bolt fitment. The allan caps inside need to be slightly sunk into the plastic body for secure connection with the metal plate holding the large gear in place. About 1mm is sufficient. I'll add the allan cap measurements, noting that longer allan caps are required inside. The front visible ones remain unaffected.