Anti-Wobble Anti-Backlash Auto Bed Probe for Prusa i3 (Cheapest)

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Outdated-Discontinued Update1 4/4/2016 : -Using Two Endstops Connected In Series At Either Sides Of The X Axis Will Improve The Leveling Repeatability. Just Flip The Part And Print For The X-Idler Side. -Changing The Probe Grid Points To 2 (4 Points Placed At The Most Rigid Areas On The Bed Which Are Usually Above The Linear Bearings Will Make Z Offset Measurement More Consistent. -------------------------------------------------------------------- This Part Is The Cheapest And Most Effective Improvement Implemented On My Homemade Prusa I3 . I Designed This Thing In The Need For Auto Bed Probing, By Remixing The Design Done By Jamesarm97 -Thanks To Him- And Adding A Holder For The Micro Switch From An Old Computer Mouse. Surprisingly, The Print Quality And Machine Reliability Improved Significantly In The Following Ways: 1.Anti_Wobble : Better Layer Alignment By Eliminating The Tension Between X - Z Axes And Preventing The Bent Z Screws Making X Axis Wobble. 2.Anti_Backlash : Basically Preventing Backlash By Using Two Nuts And A Spring Separating Them. 3.Auto_Bed_Probe :Compensating For Unlevel Build Platform By Auto Bed Probing And Setting Z Offset Matrix Which Leads To Perfect First Layer Adhesion And Perfect Finish On Faces Printed Directly On Glass (Pla). 4.Replacing The Unfriendly Z End Stop Which Required Constant Adjustment. Changes In Configuration.H In Marlin Based Machines : 1- Inverting Your Z Min End-Stop Setting. Normally, Z End-Stop Is Closed When Z Axis Homes, We Want It To Be Open When Z Axiz Homes. Const Bool Z_Min_Endstop_Inverting = False; 2-Activating Auto Bed Leveling By Delete "//" #Define Enable_Auto_Bed_Leveling 3-Update These Setting For The Probing Grid #Define Left_Probe_Bed_Position 50 #Define Right_Probe_Bed_Position 150 #Define Back_Probe_Bed_Position 150 #Define Front_Probe_Bed_Position 50 3-Set The Number Of Grid Points Per Dimension. I Wouldn'T See A Reason To Go Above 3 (=9 Probing Points On The Bed) #Define Auto_Bed_Leveling_Grid_Points 2 4-Set The Probe Offsets : These Are The Offsets To The Probe Relative To The Extruder Tip (Hotend - Probe) As We Directly Use The Hot End Nozzle To Probe Bed , Offset Of X And Y Will Be Zero. Setting The Z Offset Needs Trail And Error, Set To Zero In The First Upload And Re-Set It By Using A Sheet Of Paper As The Gauge And Reading This Value On Lcd As The Hot End Touches The Sheet.My Measurements Leaded To 1 Mm Offset Which Would Be Different Depending On The Build Platform Rigidity. #Define X_Probe_Offset_From_Extruder 0 #Define Y_Probe_Offset_From_Extruder 0 #Define Z_Probe_Offset_From_Extruder 0 Start G-Code For The Slicing Software : M104 S G28 X Y G1 X100 Y100 G28 Z G29 G1 Z0 M109 S

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