UPDATE: For now, I am limiting this to the 6mm version for revision reasons.
This is an X gantry support system for the Monoprice Select Mini (Malyan M200 ) designed to accomplish two things:
1) If your X gantry tends to droop and bed leveling is difficult, this guide rail will immediately correct that and insure the Gantry stays parallel to the bed and perpendicular to the Z axis.
2) It will reduce/eliminate oscillations of the gantry that cause ringing and other visible artifacts on your prints especially at higher print speeds.
This is a 2 variant design which includes a bolt over pylon that will attach over the existing side panel with slightly longer screws or a full replacement panel with a 40mm cooling fan. There is a linear bearing holder that screws on to the end of the X-Gantry with the original screws and than a bearing is zip tied snuggly in place. Finally, a 300mm linear shaft is slid through the linear bearing and clamped into place in the support pylon. The following links will take you to the bearing and linear rail you will need to complete this modification:
Links for 6mm hardware:
6mm Bearing: http://amzn.to/2cHacJL
6mm Shaft: http://amzn.to/2cid1mb