Dual Wiper for Lulzbot Mini

thingiverse

The Lulzbot Mini's standard felt pad cleaning strip works well to remove melted plastic but often leaves a few felt fibers on the print head. Those fibers can prevent good electrical contact between the print head and bed washers causing the G29 probe sequence to fail. This is a re-design of the pad holder that adds a secondary slot holding a 71mm x 11mm strip of Scotch Brite Non-Scratch Scour Pad. A successive wipe across this non-fiber scouring pad removes any residual fibers greatly improving reliability of the G29 sequence. You will need to cut a 71mm x 11mm strip of Scotch Brite non-scratch scour pad for the secondary slot. This material can be found at most supermarkets but I purchased from Amazon. You can cut about thirteen of the 71mm x 11mm strips from a single pad and the pads are sold in packs of three. US Amazon store: https://www.amazon.com/gp/product/B00PGETVX2 UK Amazon store: https://www.amazon.co.uk/623S-14-Count-Scotch-Brite-Scratch-Scour/dp/B0011DO14G/ You will also need to insert a few lines of Gcode into your Lulzbot Mini's start scripts. The first and last lines shown below are from the existing script to show where the new lines get inserted. The new lines are in bold: ...G1 X115 Y172 Z-0.5 F1000 ; wipe slower and bury nozzle in cleanish area **G1 Z2 ; -- raise z prepare for move to secondary wiper** G1 X105 Y181 ; -- right end of secondary wiper G1 Z1 ; -- Move down to pad G1 X85 Y181.5 F4000 ; -- wipe off lint G1 X105 Y181 F4000 ; -- wipe off lint G1 X65 Y181.5 F4000 ; -- wipe off lint G1 X85 Y181 Z0.5 F4000 ; -- wipe off lint G1 X49 Y181.5 F3000 ; -- wipe off lint G1 X69 Y181 F3000 ; -- wipe off lint G1 X49 Y181.5 F2000 ; -- wipe off lint **G1 Z10 ; raise z** IMPORTANT: The above Y positions are for a Mini 1.04 with firmware 1.1.5.xx. With firmware 1.1.0.xx replace Y181 with Y182 and Y181.5 with Y182.5 (the 1.1.5 firmware changed the Y_min and Y_max by -1). For other Mini 1.xx versions Mini-2 and/or firmware later than 1.1.5.xx: Lulzbot made multiple changes to the machine configuration and XY origin points in various printer releases and firmware versions which slightly change effective XYZ locations of the pad. Check the user comments on this thing as some users have already found and posted updated gcode for specific printers and firmware versions. Alternately you can find the positions for your printer by manually "homing" using jog controls (available from Cura Octoprint etc. or from LCD panel if your printer is so equipped) to position the nozzle then sending the printer an M114 command. That will cause the printer to report the current XYZ position of the nozzle and you can use that information to adjust the XYZ values in the example script above. The Sketchup design file is included in case you want to make alterations enjoy!