Description:

This is a front roller set for the Hydra PRO AMS that requires no permanent modification to your existing front rollers and no parts you don't already have.

Printing:

I used Bambu PETG-CF for the shafts/gears and SpiderFlex 75a Matte TPE for the roller pads. Normal PETG works fine for the shafts/gears, and PLA would presumably be fine as well. I would recommend using softer a TPU or even TPE for the roller pads if possible, alternatively you could print them in something that isn't grippy and apply some duct tape or electrical tape later. When using too hard of a material for the roller pads you may notice some roller slippage.

Assembly:

All parts are friction fit so they are very tight. I would recommend having a small mallet and some glue handy, though neither are strictly required.

1. Pull the bearing off your existing rollers. You can put these back on any time, though they're cheap so I'd recommend purchasing some. (I used these)
2. Place the bearings on the end of the two half shafts. Getting one on and gently tapping the second into place worked best for me.
3. Place the roller covers over the shafts. Take note of the end with a cutout for the bearing, that side faces outwards. Once at the point they're hard to push on by hand using an extra roller cover and a mallet to tap them the rest of the way works well.
4. Lube the gears. The lube that came with your printer works fine. (Alternatively I used this)
5. And your done!