The amslite rotary shaft is used to support and fix the material plate. Each rotary shaft has 3 material disk crampons for fixing the material plate. When the upper and lower feeder components are pulled with the consumables, the amslite rotary shaft synergistic with the material plate holder, allowing the material plate to rotate during the printing process, ensuring continuous and smooth supply of consumables. The yellow version of the rotary shaft is installed on the lower left and upper right bracket, and rotate clockwise to send the consumables into slots 2 and 4. Please note: the material disk holder can only be installedand operated correctly on the roller that matches its color version. Please confirm that you have chosen the correct version before purchasing. Hign-concerned Chemical:None Item Type:Ball Bearings Color: Yellow Material: plastic Package Contents: 1 * lite Rotary Spool Holder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.