HP-85A tape drive conversion

Gene wrote... ---- I don't have any flexable filament, so that's not gonna work. :) ---- Gene, that may not be a problem. The existing roller is rubber around a metal shaft. The shaft is thicker at the top under the roller. So I suspect that if the existing rubber was removed, you printed a round solid cylinder that was the same diameter and could be glued on top of the existing thicker portion of the shaft, and then rubber or surgical tubing was put around both solid pieces together... that may just do the magic. FYI - in the how-to video that marc did, you can see the component as-is and what must be done. That would probably give you a few ideas. https://www.youtube.com/watch?v=7IQKCiS0w2s Also - rik, regarding the tape speed difference... the dc100 to dc2000 conversion that marc did (link above), he doesn't just increase the capstan roller height, he also adds a resistor to the tape board. I haven't seen schematics on the 85A drive yet, but perhaps this is to affect a slight speed change? J